QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE FEATURES * * * * * * * * * * IDT821054 * 2 programmable tone generators per channel for testing, ringing and DTMF generation * 1 programmable FSK generator for sending Caller-ID messages * Two programmable chopper clocks * Master clock frequency selectable: 1.536 MHz, 1.544 MHz, 2.048 MHz, 3.072 MHz, 3.088 MHz, 4.096 MHz, 6.144 MHz, 6.176 MHz or 8.192 MHz * Advanced test capabilities: - 3 analog loopback tests - 5 digital loopback tests - Level metering function * High analog driving capability (300 AC) * TTL/CMOS compatible digital I/O * CODEC identification * +5 V single power supply * Low power consumption * Operating temperature range: -40C to +85C * Package available: 64 Pin PQFP 4-channel CODEC with on-chip digital filters Software selectable A/-law, linear code conversion Meets ITU-T G.711 - G.714 requirements Programmable digital filters adapting to system demands: - AC impedance matching - Transhybrid balance - Frequency response correction - Gain setting Supports two programmable PCM buses Flexible PCM interface with up to 128 programmable time slots, data rate from 512 kbits/s to 8.192 Mbits/s MPI control interface Broadcast mode for coefficient setting 7 SLIC signaling pins (including 2 debounced pins) per channel Fast hardware ring trip mechanism FUNCTIONAL BLOCK DIAGRAM CH1 CH3 VIN1 Filter and A/D Filter and A/D VOUT1 D/A and Filter 2 Inputs 3 I/Os 2 Outputs SLIC Signaling D/A and Filter DSP Core CHCLK1 CHCLK2 PLL and Clock Generation VOUT3 2 Inputs 3 I/Os 2 Outputs SLIC Signaling CH2 MCLK VIN3 CH4 General Control Logic RESET INT12 INT34 MPI Interface CCLK CS CI CO DR1 DR2 DX1 DX2 PCM Interface FS BCLK TSX1 TSX2 The IDT logo is a registered trademark of Integrated Device Technology, Inc. FEBRUARY 26, 2003 INDUSTRIAL TEMPERATURE RANGE 1 2003 Integrated Device Technology, Inc. DSC-6035/5 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE DESCRIPTION INDUSTRIAL TEMPERATURE RANGE four channels of the IDT821054. The device also provides 7 signaling pins per channel for SLICs. The IDT821054 is programmed via a Microprocessor Interface (MPI). Two PCM buses are provided to transfer the compressed or linear PCM data. The device offers strong test capability with several analog/digital loopbacks and level metering function. It brings convenience to system maintenance and diagnosis. A unique feature of "Hardware Ring Trip" is implemented in the IDT821054. When an off-hook signal is detected, the IDT821054 will reverse an output pin to stop the ringing signal immediately. The IDT821054 can be used in digital telecommunication applications such as Central Office Switch, PBX, DLC and Integrated Access Devices (IADs), i.e. VoIP and VoDSL. The IDT821054 is a feature rich, single-chip, programmable 4channel PCM CODEC with on-chip filters. Besides the -Law/A-Law companding and linear coding/decoding (14 effective bits + 2 extra sign bits), the IDT821054 also provides 1 FSK generator for sending CallerID messages, 2 programmable tone generators per channel (which can generate ring signals) and 2 programmable chopper clocks for SLICs. The digital filters in the IDT821054 provide necessary transmit and receive filtering for voice telephone circuits to interface with time-division multiplexed systems. An integrated programmable DSP realizes AC impedance matching, transhybrid balance, frequency response correction and gain adjustment functions. The IDT821054 supports 2 PCM buses with programmable sampling edge, which allows an extra delay of up to 7 clocks. Once the delay is determined, it is effective to all 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 SI2_2 SI1_2 SB3_2 SB2_2 SB1_2 SO2_2 SO1_2 SO1_1 SO2_1 SB1_1 SB2_1 SB3_1 SI1_1 SI2_1 INT12 CHCLK1 PIN CONFIGURATION IDT821054 64 Pin PQFP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 SI2_3 SI1_3 SB3_3 SB2_3 SB1_3 SO2_3 SO1_3 SO1_4 SO2_4 SB1_4 SB2_4 SB3_4 SI1_4 SI2_4 INT34 CHCLK2 VIN1 GNDA1 VOUT1 VDDA12 VOUT2 GNDA2 VIN2 CNF VDDB VIN3 GNDA3 VOUT3 VDDA34 VOUT4 GNDA4 VIN4 2 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 BCLK FS DR2 DX2 TSX2 DR1 DX1 TSX1 VDDD RESET MCLK GNDD CO CI CCLK CS IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE TABLE OF CONTENTS 1 Pin Description...................................................................................................................................................................................................7 2 Functional Description ......................................................................................................................................................................................9 2.1 MPI/PCM Interface ....................................................................................................................................................................................9 2.1.1 Microprocessor Interface (MPI) ....................................................................................................................................................9 2.1.2 PCM Bus ....................................................................................................................................................................................10 2.2 DSP Programming...................................................................................................................................................................................11 2.2.1 Signal Processing.......................................................................................................................................................................11 2.2.2 Gain Adjustment.........................................................................................................................................................................11 2.2.3 Impedance Matching ..................................................................................................................................................................11 2.2.4 Transhybrid Balance ..................................................................................................................................................................12 2.2.5 Frequency Response Correction................................................................................................................................................12 2.3 SLIC Control ............................................................................................................................................................................................12 2.3.1 SI1 and SI2.................................................................................................................................................................................12 2.3.2 SB1, SB2 and SB3 .....................................................................................................................................................................12 2.3.3 SO1 and SO2 .............................................................................................................................................................................12 2.4 Hardware Ring Trip .................................................................................................................................................................................12 2.5 Interrupt and Interrupt Enable..................................................................................................................................................................12 2.6 Debounce Filters .....................................................................................................................................................................................13 2.7 Chopper Clock.........................................................................................................................................................................................13 2.8 Dual Tone and Ring Generation..............................................................................................................................................................13 2.9 FSK SIGNAL GENERATION...................................................................................................................................................................14 2.10 Level Metering .........................................................................................................................................................................................15 2.11 Channel Power Down/Standby Mode......................................................................................................................................................16 2.12 Power Down/Suspend Mode ...................................................................................................................................................................16 3 Operating The IDT821054 ................................................................................................................................................................................17 3.1 Programming Description ........................................................................................................................................................................17 3.1.1 Command Type and Format ......................................................................................................................................................17 3.1.2 Addressing the Local Registers..................................................................................................................................................17 3.1.3 Addressing the Global Registers................................................................................................................................................17 3.1.4 Addressing the Coe-RAM...........................................................................................................................................................17 3.1.5 ADDRESSING FSK-RAM...........................................................................................................................................................18 3.1.6 Programming Examples .............................................................................................................................................................18 3.1.6.1 Example of Programming Local Registers .................................................................................................................18 3.1.6.2 Example of Programming Global Registers................................................................................................................18 3.1.6.3 Example of Programming the Coefficient-RAM..........................................................................................................18 3.1.6.4 Example of Programming the FSK-RAM....................................................................................................................19 3.2 Power-on Sequence ................................................................................................................................................................................21 3.3 Default State After Reset.........................................................................................................................................................................21 3.4 Registers Description ..............................................................................................................................................................................22 3.4.1 Registers Overview ....................................................................................................................................................................22 3.4.2 Global Registers List ..................................................................................................................................................................24 3.4.3 Local Registers List ....................................................................................................................................................................31 4 Absolute Maximum Ratings ............................................................................................................................................................................35 5 Recommended DC Operating Conditions .....................................................................................................................................................35 6 Electrical Characteristics ................................................................................................................................................................................35 6.1 Digital Interface........................................................................................................................................................................................35 6.2 Power Dissipation....................................................................................................................................................................................35 6.3 Analog Interface ......................................................................................................................................................................................36 7 Transmission Characteristics .........................................................................................................................................................................37 7.1 Absolute Gain ..........................................................................................................................................................................................37 7.2 Gain Tracking ..........................................................................................................................................................................................37 7.3 Frequency Response ..............................................................................................................................................................................37 3 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 7.4 7.5 7.6 7.7 7.8 INDUSTRIAL TEMPERATURE RANGE Group Delay ............................................................................................................................................................................................38 Distortion .................................................................................................................................................................................................38 Noise .......................................................................................................................................................................................................39 Interchannel Crosstalk.............................................................................................................................................................................39 Intrachannel Crosstalk.............................................................................................................................................................................39 8 Timing Characteristics ....................................................................................................................................................................................40 8.1 Clock Timing............................................................................................................................................................................................40 8.2 Microprocessor Interface Timing .............................................................................................................................................................41 8.3 PCM Interface Timing..............................................................................................................................................................................42 9 Appendix: IDT821054 Coe-RAM Mapping......................................................................................................................................................43 10 Ordering Information .......................................................................................................................................................................................44 4 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE LIST OF FIGURES Figure - 1 Figure - 2 Figure - 3 Figure - 4 Figure - 5 Figure - 6 Figure - 7 Figure - 8 Figure - 9 Figure - 10 Figure - 11 Figure - 12 Figure - 13 An Example of the MPI Interface Write Operation .............................................................................................................................. 9 An Example of the MPI Interface Read Operation (ID = 81H)............................................................................................................. 9 Sampling Edge Selection Waveform................................................................................................................................................. 10 Signal Flow for Each Channel ........................................................................................................................................................... 11 Debounce Filter ................................................................................................................................................................................. 13 General Procedure of Sending Caller-ID Signal................................................................................................................................ 14 A Recommended Procedure of Programming the FSK Generator ................................................................................................... 15 Clock Timing...................................................................................................................................................................................... 40 MPI Input Timing ............................................................................................................................................................................... 41 MPI Output Timing ............................................................................................................................................................................ 41 Transmit and Receive Timing............................................................................................................................................................ 42 Typical Frame Sync Timing (2 MHz Operation) ................................................................................................................................ 42 Coe-RAM Mapping............................................................................................................................................................................ 43 5 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE LIST OF TABLES Table - 1 Table - 2 Table - 3 Table - 4 Table - 5 BT/Bellcore Standard of FSK Signal ..................................................................................................................................................14 Consecutive Adjacent Addressing......................................................................................................................................................17 Global Registers (GREG) Mapping ....................................................................................................................................................22 Local Registers (LREG) Mapping.......................................................................................................................................................23 Coe-RAM Address Allocation.............................................................................................................................................................43 6 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 1 INDUSTRIAL TEMPERATURE RANGE PIN DESCRIPTION Name Type Pin Number Description GNDA1 GNDA2 GNDA3 GNDA4 Ground 50 54 59 63 Analog Ground. All ground pins should be connected together. GNDD Ground 21 Digital Ground. All digital signals are referred to this pin. VDDA12 VDDA34 Power 52 61 +5 V Analog Power Supply. These pins should be connected to ground via a 0.1 F capacitor. All power supply pins should be connected together. VDDD Power 24 +5 V Digital Power Supply. VDDB Power 57 +5 V Analog Power Supply. This pin should be connected to ground via a 0.1 F capacitor. All power supply pins should be connected together. CNF - 56 Capacitor Noise Filter. This pin should be connected to ground via a 0.22 F capacitor. VIN1-4 I 49, 55, 58, 64 Analog Voice Inputs of Channel 1-4. These pins should be connected to the corresponding SLIC via a 0.22 F capacitor. VOUT1-4 O 51, 53, 60, 62 Voice Frequency Receiver Outputs of Channel 1-4. These pins can drive 300 AC load. It can drive transformers directly. SI1_(1-4) SI2_(1-4) I 36, 47, 2, 13 SLIC Signalling Inputs with debounce function for Channel 1-4. 35, 48, 1, 14 SB1_(1-4) SB2_(1-4) SB3_(1-4) I/O 39, 44, 5, 10 Bi-directional SLIC Signalling I/Os for Channel 1-4. 38, 45, 4, 11 These pins can be individually programmed as input or output. 37, 46, 3, 12 SO1_(1-4) SO2_(1-4) O 41, 42, 7, 8 SLIC Signalling Outputs for Channel 1-4. 40, 43, 6, 9 DX1 O 26 Transmit PCM Data Output, PCM Highway One. Transmit PCM Data to PCM highway one. This pin is a tri-state output pin. DX2 O 29 Transmit PCM Data Output, PCM Highway Two. Transmit PCM Data to PCM highway two. This pin is a tri-state output pin. DR1 I 27 Receive PCM Data Input, PCM Highway One. The PCM data is received from PCM highway one (DR1) or two (DR2). The receive PCM highway is selected by local register LREG6. DR2 I 30 Receive PCM Data Input, PCM Highway Two. The PCM data is received from PCM highway one (DR1) or two (DR2). The receive PCM highway is selected by local register LREG6. FS I 31 Frame Synchronization. FS is an 8 kHz synchronization clock that identifies the beginning of the PCM frame. BCLK I 32 Bit Clock. This pin clocks out the PCM data to DX1 or DX2 pin and clocks in PCM data from DR1 or DR2 pin. It may vary from 512 kHz to 8.192 MHz and should be synchronous to FS. TSX1 TSX2 0 25 28 Transmit Output Indicator. The TSX1 pin becomes low when PCM data is transmitted via DX1. Open-drain. The TSX2 pin becomes low when PCM data is transmitted via DX2. Open-drain. 7 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE Name Type Pin Number Description CS I 17 Chip Selection. A logic low level on this pin enables the Serial Control Interface. CI I 19 Serial Control Interface Data Input. Control data input pin. CCLK determines the data rate. CO O 20 Serial Control Interface Data Output (Tri-State). Control data output pin. CCLK determines the data rate. CCLK I 18 Serial Control Interface Clock. This is the clock for the Serial Control Interface. It can be up to 8.192 MHz. MCLK I 22 Master Clock Input. This pin provides the clock for the DSP of the IDT821054. The frequency of the MCLK can be 1.536 MHz, 1.544 MHz, 2.048 MHz, 3.072 MHz, 3.088 MHz, 4.096 MHz, 6.144 MHz, 6.176 MHz or 8.192 MHz. RESET I 23 Reset Input. Forces the device to default mode. Active low. INT12 O 34 Interrupt Output Pin for Channel 1-2. Active high interrupt signal for Channel 1 and 2, open-drain. It reflects the changes on the corresponding SLIC input pins. INT34 O 15 Interrupt Output Pin for Channel 3-4. Active high interrupt signal for Channel 3 and 4, open-drain. It reflects the changes on the corresponding SLIC input pins. CHCLK1 O 33 Chopper Clock Output One. Provides a programmable output signal (2 -28 ms) synchronous to MCLK. CHCLK2 O 16 Chopper Clock Output Two. Provides a programmable output signal (256 kHz, 512 kHz or 16.384 MHz) synchronous to MCLK. 8 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 2 FUNCTIONAL DESCRIPTION interface and the Coefficient-RAM of the IDT821054 are programmed by the master device via MPI, which consists of four lines (pins): CCLK, CS, CI and CO. All commands and data are aligned in byte (8 bits) and transferred via the MPI interface. CCLK is the clock of the MPI interface. The frequency of CCLK can be up to 8.192 MHz. CS is the chip selection pin. A low level on CS enables the MPI interface. CI and CO are data input and data output pins, carrying control commands and data bytes to/from the IDT821054. The data transfer is synchronized to the CCLK signal. The contents of CI is latched on the rising edges of CCLK, while CO changes on the falling edges of CCLK. The CCLK signal is the only reference of CI and CO pins. Its duty and frequency may not necessarily be standard. When the CS pin becomes low, the IDT821054 treats the first byte on the CI pin as command and the rest as data. To write another command, the CS pin must be changed from low to high to finish the previous command and then changed from high to low to indicate the start of a new command. When a read/write operation is completed, the CS pin must be set to high in 8-bit time. During the execution of commands that are followed by output data byte(s), the IDT821054 will not accept any new commands from the CI pin. But the data transfer sequence can be interrupted by setting the CS pin to high at any time. See Figure - 1 and Figure - 2 for examples of MPI write and read operation timing diagrams. The IDT821054 is a four-channel PCM CODEC with on-chip digital filters. It provides a four-wire solution for the subscriber line circuitry in digital switches. The IDT821054 converts analog voice signals to digital PCM samples and digital PCM samples back to analog voice signals. The digital filters are used to bandlimit the voice signals during conversion. High performance oversampling Analog-to-Digital Converters (ADC) and Digital-to-Analog Converters (DAC) in the IDT821054 provide the required conversion accuracy. The associated decimation and interpolation filtering is performed by both dedicated hardware and Digital Signal Processor (DSP). The DSP also handles all other necessary procession such as PCM bandpass filtering, sample rate conversion and PCM companding. 2.1 MPI/PCM INTERFACE A serial Microprocessor Interface (MPI) is provided for the master device to control the IDT821054. Two PCM buses are provided to transfer the digital voice data. 2.1.1 INDUSTRIAL TEMPERATURE RANGE MICROPROCESSOR INTERFACE (MPI) The internal configuration registers (local/global), the SLIC signaling CCLK CS CI 7 6 5 4 3 2 1 0 7 6 5 Command Byte CO 4 3 2 1 0 7 6 5 Data Byte 1 4 3 2 1 0 2 1 0 Data Byte 2 High 'Z' Figure - 1 An Example of the MPI Interface Write Operation CCLK CS Ignored CI 7 6 5 4 3 2 1 0 Command Byte CO High 'Z' Identification Code '1' '0' '0' '0' '0' '0' Data Byte 1 '0' '1' 7 6 Figure - 2 An Example of the MPI Interface Read Operation (ID = 81H) 9 5 4 3 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 2.1.2 INDUSTRIAL TEMPERATURE RANGE complement number (b13 to b0 are effective bits, b15 and b14 are as same as the sign bit b13). So, the voice data of one channel occupies one time slot group, which consists of 2 adjacent time slots. The TT[6:0] bits in LREG5 select a transmit time slot group for the specified channel. If TT[6:0] = n(d), it means that time slots TS(2n+1) and TS(2n+2) are selected. For example, if TT[6:0] = 00H, it means that TS0 and TS1 are selected. The RT[6:0] bits in LREG6 select a receive time slot group for the specified channel in the same way. The PCM data of each individual channel can be clocked out to transmit PCM highway one (DX1) or two (DX2) on the programmed edges of BCLK according to time slot assignment. The transmit PCM highway is selected by the THS bit in LREG5. The frame sync (FS) pulse identifies the beginning of a transmit frame (TS0). The PCM data is serially transmitted on DX1 or DX2 with MSB first. The PCM data of each individual channel is received from receive PCM highway one (DR1) or two (DR2) on the programmed edges of BCLK according to time slot assignment. The receive PCM highway is selected by the RHS bit in LREG6. The frame sync (FS) pulse identifies the beginning of a receive frame (TS0). The PCM data is serially received from DR1 or DR2 with MSB first. PCM BUS The IDT821054 provides two flexible PCM buses for all 4 channels. The digital PCM data can be compressed (A/-law) or linear code. As shown in Figure - 3, the data rate can be configured as same as the Bit Clock (BCLK) or half of it. The PCM data is transmitted or received either on the rising edges or on the falling edges of the BCLK signal. The transmit and receive time slots can offset from the FS signal by 0 to 7 periods of BCLK. All these configurations are made by global register GREG7, which is effective for all four channels. The PCM data of each channel can be assigned to any time slot of the PCM bus. The number of available time slots is determined by the frequency of the BCLK signal. For example, if the frequency is 512 kHz, 8 time slots (TS0 to TS7) are available. If the frequency is 1.024 MHz, 16 time slots (TS0 to TS15) are available. The IDT821054 accepts BCLK frequency of 512 kHz to 8.192 MHz at increments of 64 kHz. When compressed PCM code (8-bit wide) is selected, the voice data of one channel occupies one time slot. The TT[6:0] bits in local register LREG5 select the transmit time slot for each channel, while the RT[6:0] bits in LREG6 select the receive time slot for each channel. When linear PCM code is selected, the voice data is a 16-bit 2's Transmit Receive FS PCM Clock Slope Bits in GREG7: BCLK Single Clock CS = 000 CS = 001 CS = 010 CS = 011 Bit 7 TS0 BCLK Double Clock CS = 100 CS = 101 CS = 110 CS = 111 Figure - 3 Sampling Edge Selection Waveform 10 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 2.2 DSP PROGRAMMING 2.2.1 SIGNAL PROCESSING INDUSTRIAL TEMPERATURE RANGE impedance, balance transhybrid and correct frequency response. All the coefficients of the digital filters can be calculated automatically by a software provided by IDT. When users provide accurate SLIC model, impedance and gain requirements, this software will calculate all the coefficients automatically. After loading these coefficients to the coefficient RAM of the IDT821054, the final AC characteristics of the line card (consists of SLIC and CODEC) will meet the ITU-T specifications. Several blocks are programmable for signal processing. This allows users to optimize the performance of the IDT821054 for the system. Figure - 4 shows the signal flow for each channel and indicates the programmable blocks. The programmable digital filters are used to adjust gain and LREG1: CS[3] CS[3] = 1: enable (normal) CS[3] = 0: disable (bypass) Transmit Path Analog @64 KHz @2 MHz @8 KHz @16 KHz TS PCM Highway Level Meter VIN LPF/AA UF GRX U2 FRX HPF ECF LPF FRR EXP FSK LREG1: CS[2] CS[2] = 1: enable (normal) CS[2] = 0: disable (cut) LREG1: CS[0] CS[0] = 1: enable (normal) CS[0] = 0: disable (cut) CMP LREG1: CS[1] CS[1] = 1: enable (normal) CS[1] = 0: disable (cut) Dual Tone TSA DX1/DX2 ALB-DI U1 LPF DLB-DI - IMF D2 DLB-PCM LPF/SC GIS GTX DLB-8K ALB-8K ALB-1BIT DLB_1BIT DLB-ANA VOUT D1 - TSA DR1/DR2 CUT-OFF-PCM Bold Black Framed: Programmable Filters Receive Path Fine Black Framed: Fixed Filters Figure - 4 Signal Flow for Each Channel Abbreviation List: LPF/AA: Anti-Alias Low-pass Filter LPF/SC: Smoothing Low-pass Filter LPF: Low-pass Filter HPF: High-pass Filter GIS: Gain for Impedance Scaling D1: 1st Down Sample Stage D2: 2nd Down Sample Stage U1: 1st Up Sample Stage U2: 2nd Up Sample Stage UF: Up Sampling Filter (64 k - 128 k) 2.2.2 IMF: Impedance Matching Filter ECF: Echo Cancellation Filter GTX: Gain for Transmit Path GRX: Gain for Receive Path FRX: Frequency Response Correction for Transmit FRR: Frequency Response Correction for Receive CMP: Compression EXP: Expansion TSA: Time Slot Assignment (GRX) is programmable from -12 dB to +3 dB with minimum 0.1 dB step. If the CS[7] bit in LREG1 is `0', the GRX filter is disabled. If the CS[7] bit is `1', the GRX is programmed by the coefficient RAM. GAIN ADJUSTMENT The analog gain and digital gain of each channel can be adjusted separately in the IDT821054. For each individual channel, the analog A/D gain in the transmit path can be selected as 0 dB or 6 dB. The selection is done by the GAD bit in LREG9. It is 0 dB by default. For each individual channel, the analog D/A gain in the receive path can be selected as 0 dB or -6 dB. The selection is done by the GDA bit in LREG9. It is 0 dB by default. For each individual channel, the digital gain in the transmit path (GTX) is programmable from -3 dB to +12 dB with minimum 0.1 dB step. If the CS[5] bit in local register LREG1 is `0', the GTX filter is disabled. If the CS[5] bit is `1', the GTX is programmed by the coefficient RAM. For each individual channel, the digital gain in the receive path 2.2.3 IMPEDANCE MATCHING The IDT821054 provides a programmable feedback path from VIN to VOUT for each channel. This feedback synthesizes the two-wire impedance of the SLIC. The programmable Impedance Matching Filter (IMF) and Gain of Impedance Scaling filter (GIS) work together to realize impedance matching. If the CS[0] bit in LREG1 is `0', the IMF is disabled. If the CS[0] bit is `1', the IMF coefficient is programmed by the coefficient RAM. If the CS[2] bit in LREG1 is `0', the GIS filter is disabled. If the CS[2] bit is `1', the GIS coefficient is programmed by the coefficient RAM. 11 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 2.2.4 2.3.3 TRANSHYBRID BALANCE INDUSTRIAL TEMPERATURE RANGE SO1 AND SO2 The ECF filter is used to adjust transhybrid balance and ensure that the echo cancellation meets the ITU-T specifications. If the CS[1] bit in LREG1 is `0', the ECF filter is disabled. If the CS[1] bit is `1', the ECF coefficient is programmed by the coefficient RAM. The control data can only be written to the two output pins SO1 and SO2 by local register LREG4 on a per-channel basis. When being read, the SO1 and SO2 bits in LREG4 will be read out with the data written to them in the previous write operation. 2.2.5 2.4 FREQUENCY RESPONSE CORRECTION The IDT821054 provides two filters that can be programmed to correct any frequency distortion caused by the impedance matching filter. They are the Frequency Response Correction in the Transmit path filter (FRX) and the Frequency Response Correction in the Receive path filter (FRR). If the CS[4] bit in LREG1 is `0', the FRX filter is disabled. If the CS[4] bit is `1', the FRX coefficient is programmed by the coefficient RAM. If the CS[6] bit in LREG1 is `0', the FRR filter is disabled. If the CS[6] bit is `1', the FRR coefficient is programmed by the coefficient RAM. Refer to "9 Appendix: IDT821054 Coe-RAM Mapping" for the address of the GTX, GRX, FRX, FRR, GIS, ECF and IMF coefficients. 2.3 In order to avoid the damage caused by high voltage ring signal, the IDT821054 provides a hardware ring trip function to respond to the offhook signal as fast as possible. This function is enabled by setting the RTE bit in GREG8 to `1'. The off-hook signal can be input via either SI1 or SI2 pin, while the ring control signal can be output via any of the SO1, SO2, SB1, SB2 and SB3 pins (assume that SB1-SB3 are configured as outputs). The IS bit in GREG8 is used to select an input pin and the OS[2:0] bits are used to select an output pin. When a valid off-hook signal arrives at the selected input pin (SI1 or SI2), the IDT821054 will turn off the ring signal by inverting the logic level of the selected output pin (SO1, SO2, SB1, SB2 or SB3), regardless of the value of the corresponding SLIC output control register (the value should be changed later). This function provides a much faster response to off-hook signals than the software ring trip which turns off the ring signal by changing the value of the corresponding register. The IPI bit in GREG8 is used to indicate the valid polarity of the input pin. If the off-hook signal is active low, the IPI bit should be set to `0'. If the off-hook signal is active high, the IPI bit should be set to `1'. The OPI bit in GREG8 is used to indicate the valid polarity of the output pin. If the ring control signal is required to be low in normal status and high to activate a ring, the OPI bit should be set to `1'. If it is required to be high in normal status and low to activate a ring, the OPI bit should be set to `0'. Here is an example: In a system where the off-hook signal is active low and ring control signal is active high, the IPI bit should be set to `0' and the OPI bit should be set to `1'. In normal status, the selected input (off-hook signal) is high and the selected output (ring control signal) is low. When the ring is activated by setting the output (ring control signal) to high, a low pulse appearing on the input (off-hook signal) will inform the device to invert the output to low and cut off the ring signal. SLIC CONTROL The SLIC control interface of the IDT821054 consists of 7 pins per channel: 2 inputs SI1 and SI2, 3 I/Os SB1 to SB3, and 2 outputs SO1 and SO2. 2.3.1 SI1 AND SI2 The SLIC inputs SI1 and SI2 can be read in 2 ways - globally for all 4 channels or locally for each individual channel. The SI1 and SI2 status of all 4 channels can be read via global register GREG9. The SIA[3:0] bits in this register represent the debounced SI1 data of Channel 4 to Channel 1. The SIB[3:0] bits in this register represent the debounced SI2 data of Channel 4 to Channel 1. Both the SI1 and SI2 pins can be connected to off-hook, ring trip, ground key signals or other signals. The global register GREG9 provides a more efficient way to obtain time-critical data such as on/offhook and ring trip information from the SLIC input pins SI1 and SI2. The SI1 and SI2 status of each channel can also be read via the corresponding local register LREG4. 2.3.2 HARDWARE RING TRIP SB1, SB2 AND SB3 The SLIC I/O pin SB1 of each channel can be configured as input or output via global register GREG10. The SB1C[3:0] bits in GREG10 determine the SB1 directions of Channel 4 to Channel 1: `0' means input and '1' means output. The SB2C[3:0] bits in GREG11 and the SB3C[3:0] bits in GREG12 respectively determine the SB2 and SB3 directions of Channel 4 to Channel 1 in the same way. If the SB1, SB2 or SB3 pin is selected as input, its information can be read from both global and local registers. The SB1[3:0], SB2[3:0] and SB3[3:0] bits in global registers GREG10, GREG11 and GREG12 respectively contain the information of SB1, SB2 and SB3 for all four channels. Users can also read the information of SB1, SB2 and SB3 of the specified channel from local register LREG4. If the SB1, SB2 and SB3 pins are configured as outputs, data can only be written to them via GREG10, GREG11 and GREG12 respectively. 2.5 INTERRUPT AND INTERRUPT ENABLE An interrupt mechanism is provided in the IDT821054 for reading the SLIC input state. Each change of the SLIC input state will generate an interrupt. Any of the SLIC inputs including SI1, SI2, SB1, SB2 and SB3 (if SB1SB3 are configured as inputs) can be an interrupt source. As SI1 and SI2 signals are debounced while the SB1 to SB3 signals are not, users should pay more attention to the interrupt sources of SB1 to SB3. Local register LREG2 is used to enable/disable the interrupts. Each bit of IE[4:0] in LREG2 corresponds to one interrupt source of the specified channel. When one bit of IE[4:0] is `0', the corresponding interrupt is ignored (disabled), otherwise, the corresponding interrupt is recognized (enabled). Multiple interrupt sources can be enabled at the same time. All interrupts can be cleared simultaneously by executing a write operation to global register GREG2. Additionally, the interrupts caused by all four 12 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE The debounced SI1 signals of Channel 4 to 1 are written to the SIA[3:0] bits in GREG9. The corresponding SIA bit will not be updated until the value of the counter is reached. The SI1 pin usually contains the SLIC switch hook status. The GK[3:0] bits in LREG3 are used to program the debounce interval of the SI2 input of the corresponding channel. The debounced SI2 signals of Channel 4 to 1 are written to the SIB[3:0] bits in GREG9. The GK debounce filter consists of a six-state up/down counter that ranges between 0 and 6. This counter is clocked by the GK timer at the sampling period of 0-30 ms, which is programmed via LREG3. If the sampled value is low, the value of the counter will be decremented by each clock pulse. If the sampled value is high, the value of the counter is incremented by each clock pulse. When the value increases to 6, it sets a latch whose output is routed to the corresponding SIB bit. If the value decreases to 0, the latch will be cleared and the output bit will be set to 0. In other cases, the latch and the SIB status remain in their previous state without being changed. In this way, at least six consecutive GK clocks with the debounce input remaining at the same state can effect an output change. channels' SI1 and SI2 status changes can be cleared by applying a read operation to GREG9. If SB1, SB2 and SB3 pins are configured as inputs, a read operation to GREG10, GREG11 and GREG12 clears the interrupt generated by the corresponding SB port of all four channels. A read operation to LREG4 clears all 7 interrupt sources of the specified channel. 2.6 DEBOUNCE FILTERS For each channel, the IDT821054 provides two debounce filter circuits: Debounced Switch Hook (DSH) Filter for the SI1 signal and Ground Key (GK) Filter for the SI2 signal. See Figure - 5 for details. The two debounce filters are used to buffer the input signals on SI1 and SI2 pins before changing the state of the SLIC Debounced Input SI1/SI2 Register (GREG9). The Frame Sync (FS) signal is necessary for both DSH and GK filters. The DSH[3:0] bits in LREG3 are used to program the debounce period of the SI1 input of the corresponding channel. The DSH filter is initially clocked at half of the frame sync rate (250 s). Any data changing at this sample rate resets a counter that clocks at the rate of 2 ms. The value of the counter is programmable from 0 to 30 via LREG3. SI1 D Q D INDUSTRIAL TEMPERATURE RANGE Q D Q D Q SIA E DSH[3:0] Debounce Period (0-30 ms) FS/2 4 kHz =0 0 SI2 GK[3:0] Debounce Interval (0-30 ms) D Q 7 bit Debounce Counter up/ Q down D Q RST 7 bit Debounce Counter SIB GK 6 states Up/down Counter Figure - 5 Debounce Filter 2.7 CHOPPER CLOCK The dual tone generators of each channel can be enabled by setting the TEN0 and TEN1 bits in LREG10 to `1'respectively. The frequency and amplitude of the tone signal are programmed by the Coe-RAM. The frequency and amplitude coefficients are calculated by the following formulas: Frequency coefficient = 32767 cos(f / 8000 2 ) Amplitude coefficient = A 32767 sin(f / 8000 2 ) Herein, 'f' is the desired frequency of the tone signal, 'A' is the scaling parameter of the amplitude. The range of 'A' is from 0 to 1. A = 1, corresponds to the maximum amplitude of 1.57 V. A = 0, corresponds to the minimum amplitude of 0 V. It is a linear relationship between 'A' and the amplitude. That is, if A= ( 0<<1), the amplitude will be 1.57 (V). The frequency range is from 25 Hz to 3400 Hz. The frequency tolerances are as the following: 25 Hz < f < 40 Hz, tolerance < 12% The IDT821054 provides two programmable chopper clock outputs CHCLK1 and CHCLK2. They can be used to drive the power supply switching regulators on SLICs. The two chopper clocks are synchronous to MCLK. The CHCLK1 outputs a signal which clock cycle is programmable from 2 to 28 ms. The CHCLK2 outputs a signal which frequency can be 256 kHz, 512 kHz or 16.384 MHz. The frequencies of the two chopper clocks are programmed by global register GREG5. 2.8 DUAL TONE AND RING GENERATION The IDT821054 provides two tone generators (tone generator 0 and tone generator 1) for each channel. They can produce signals such as test tone, DTMF, dial tone, busy tone, congestion tone and Caller-ID Alerting Tone, and output it to the VOUT pin. 13 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 40 Hz < f < 60 Hz, tolerance < 5% 60 Hz < f < 100 Hz, tolerance < 2.5% 100 Hz < f < 3400 Hz, tolerance < 1% The frequency and amplitude coefficients should be converted to corresponding hexadecimal values before being written to the CoeRAM. Refer to "9 Appendix: IDT821054 Coe-RAM Mapping" for the address of the tone coefficients. The ring signal is a special signal generated by the dual tone generators. When only one tone generator is enabled, or dual tone generators produce the same tone signal and frequency of the tone meets the ring signal requirement (10 Hz to 100 Hz), a ring signal will be generated and output to the VOUT pin. 2.9 INDUSTRIAL TEMPERATURE RANGE = 5 (d), the Seizure Length will be 10 (d). The Mark Signal is a series of '1'. The length of the Mark Signal (Mark Length) is determined by the ML[7:0] bits in GREG16. The Caller-ID message should be written to the FSK-RAM before it is sent out. The FSK-RAM consists of 32 words, and each word consists of two bytes, so it can contain up to 64 bytes of message at one time. If the total message is longer than 64 bytes, it should be written to the FSKRAM at two or more times. Data Length, i.e. the number of the data bytes that are written to the FSK-RAM for transmission, is set by the DL[7:0] bits in GREG14. One 'Word' of the Caller-ID message consists of 10 bits: one Start Bit at the beginning, one Stop Bit at the end and eight bits of Caller-ID message in the middle. For the IDT821054, the eight bits of Caller-ID message are from the FSK-RAM, and the Start Bit/Stop Bit will be added automatically when sending the Caller-ID message. The Flag Signal is a series of '1'. The length of the Flag Signal (Flag Length) is determined by the FL[7:0] bits in GREG13. The BS (BT/Bellcore Selection) bit in GREG17 determines which specification the FSK generator will follow. The IDT821054 supports both Bellcore 202 and BT standards. Table - 1 is the comparison of these two standards. FSK SIGNAL GENERATION The IDT821054 has a built-in FSK generator for all four channels to send Caller-ID signals. The general procedure of sending a Caller-ID signal is as shown in Figure - 6. Start Table - 1 BT/Bellcore Standard of FSK Signal Send Seizure Signal Send Mark Signal Send One Word of Caller-ID Message Item BT Bellcore Mark (1) frequency 1300 Hz 1.5% 1200 Hz 1.1% Space (0) frequency 2100 Hz 1.1% 2200 Hz 1.1% Transmission rate 1200 baud 1% 1200 Hz 1% Word format 1 start bit which is `0', 8 word bits (with least significant bit LSB first), 1 stop bit which is `1'. 1 start bit which is `0', 8 word bits (with least significant bit LSB first), 1 stop bit which is `1'. The MAS (Mark After Send) bit in GREG17 determines whether to keep on sending a series of '1's after the completion of sending the content in the FSK-RAM. If the total Caller-ID message is longer than 64 bytes, the MAS bit should be set to '1' to hold the link after the first 64 bytes of Caller-ID message have been sent. Then, users can update the FSK-RAM with new data and send the new data without re-sending the Seizure Signal and Mark Signal. This is important to keep the integrity of Caller-ID information. The FCS[2:0] (FSK Channel Selection) bits in GREG17 are used to select one of the four channels to send the FSK signal. The FO bit GREG17 is used to enable/disable the FSK generator. When all configurations and FSK-RAM updating have been completed, the FS (FSK Start) bit in GREG17 should be set to `1' to trigger the sending of FSK signal. The FS bit will be reset to `0' after all data bytes in the FSKRAM have been sent out. A recommended procedure of programming the FSK generator is shown in Figure - 7. Send Flag Signal No Complete Caller-ID Message Sending? Yes Stop Figure - 6 General Procedure of Sending Caller-ID Signal The Seizure Signal is a series of '01' pairs. Seizure Length, i.e. the number of the `01' pairs of the Seizure Signal, is programmable. It is two times of the value of the SL[7:0] bits in GREG15. For example, if SL[7:0] 14 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE Start Read FO and FS bit in GREG17 FO = 1 ? Y N N Set FO = 1 FS = 0 ? Y Set "Seizure Length" in GREG15 Set "Mark Length" in GREG16 Set "Flag Length" in GREG13 Total message data 64 bytes ? N Y Set "Data Length" in GREG14 Write message data into FSK-RAM In GREG17: Set FCS[2:0] bits to select FSK channel Set BS bit to select specification (Bellcore or BT) Set MAS = 0 Set FS = 1 N GREG14: Set "Data Length" at this time GREG16: Set "Mark Length" to 0 Write message data to be sent at this time to FSK-RAM GREG15: Set "Seizure Length" to 0 In GREG17: Set FCS[2:0] bits to select FSK channel Set BS bit to select specification (Bellcore or BT) Set MAS = 1 Set FS = 1 Finish sending message data ? Finish sending all the message data ? Y N Y GREG17: FO = 0 GREG17: MAS = 0; FO = 0 End End Figure - 7 A Recommended Procedure of Programming the FSK Generator 2.10 LEVEL METERING GREG19. The LVLL[7:0] bits in GREG18 contain the lower 7 bits of the result and a data-ready bit (LVLL[0]), while the LVLH[7:0] bits in GREG19 contain the higher 8 bits of the result. An internal accumulator sums the rectified samples until the value set in GREG20 is reached. By then, the LVLL[0] bit is set to `1' and accumulation result is latched into GREG18 and GREG19 simultaneously. Once the higher byte of result (GREG19) is read, the LVLL[0] bit in GREG18 will be reset. It will be set to `1' again by a new data available. The contents of GREG18 and GREG19 will be overwritten by the following metering result if they have not been read out yet. To read the level meter result registers, it is recommended to read GREG18 (lower byte of result) first. The L/C bit in GREG21 determines the level meter operation mode. If the L/C bit is `1', it means that metering mode is selected. In this mode, The IDT821054 integrates a level meter which is shared by all 4 channels. The level meter is designed to emulate the off-chip PCM test equipment so as to facilitate the line-card, subscriber line and users telephone set monitoring. The level meter tests the return signal and reports the measurement result via the MPI interface. When combined with tone generation and loopbacks, it allows the microprocessor to test the channel integrity. The signal on the channel selected by the CS[1:0] bits in GREG21 will be metered. The level meter is enabled by setting the LMO bit in GREG21 to `1'. A level meter counter register (GREG20) is used to set the value of time cycles for sampling the PCM data (8 kHz sampling rate). The output of level meter is sent to the level meter result registers GREG18 and 15 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 2.11 the linear PCM data will be sent to the level meter and the metering result will be output to GREG18 and GREG19. With this result, the signal level can be calculated. For A-law compressed PCM code or linear PCM code, the signal level can be calculated by the following formula: INDUSTRIAL TEMPERATURE RANGE CHANNEL POWER DOWN/STANDBY MODE Each individual channel of the IDT821054 can be powered down independently by setting the PD bit in LREG9 to `1'. If one channel is powered down and enters the standby mode, the PCM data transfer and the D/A, A/D converters of this channel will be disabled. In this way, the power consumption of the device can be reduced. When the IDT821054 is powered up or reset, all four channels will be powered down. All circuits that contain programmed information retain their data after power down. The microprocessor interface is always active so that new commands can be received and executed. 5 LM Result x 2 x A ( dbm0 ) = 20 x log -------------------------------------------------------------- + 3.14 LM x 2 x 8192 Countnumber For -law compressed PCM code, the signal level can be calculated by the following formula: 5 LM Result x 2 x A ( dbm0 ) = 20 x log -------------------------------------------------------------- + 3.17 LM Countnumber x 2 x 8192 2.12 POWER DOWN/SUSPEND MODE A suspend mode is provided for the whole chip to save power. The suspend mode saves much more power consumption than the standby mode. In this mode, the PLL block is turned off and the DSP operation is disabled. Only global and local commands can be executed, the RAM operation is disabled as the internal clock has been turned off. The PLL block is powered down by setting the PPD bit in GREG22 to `1'. Once the PLL and all four channels are powered down, the IDT821054 will enter the suspend mode. LMResult: the value in the level meter result registers (GREG18 & GREG19); LMCountnumber:the count number of the level meter (set in GREG20). If the L/C bit is `0', it means that message mode is selected. In this mode, the compressed PCM data will be output to GREG19 transparently without metering. Refer to the Application Note for further details on the level meter. 16 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 3 OPERATING THE IDT821054 3.1 PROGRAMMING DESCRIPTION via GREG6, the corresponding local registers of the specified channels will be addressed by a Local Command at the same time. The IDT821054 provides a consecutive adjacent addressing method for accessing the local registers. According to the address specified in a Local Command, there will be 1 to 4 adjacent local registers to be addressed automatically, with the highest order first. For example, if the address specified in a Local Command ends with `11' (b1b0 = 11), 4 adjacent registers will be addressed by this command; if b1b0 = 10, 3 adjacent registers will be addressed. See Table - 2 for details. The IDT821054 is programmed by writing commands to registers and coefficient RAM. A Channel Program Enable register (GREG6) is provided for addressing individual or multiple channels. The CE[3:0] bits in this register are assigned to Channel 4 to Channel 1 respectively. The channels are enabled to be programmed by setting their respective CE bits to `1'. If two or more channels are enabled, the successive write commands will be effective to all enabled channels. A broadcast mode can be implemented by simply enabling all four channels before performing other write-operation. The broadcast mode is very useful for configuring the coefficient RAM of the IDT821054 in a large system. But for read operations, multiple addressing is not allowed. The IDT821054 uses an Identification Code to distinguish itself from other devices in the system. When being read, the IDT821054 will output an Identification Code of 81H first to indicate that the following data bytes are from the IDT821054. 3.1.1 Table - 2 Consecutive Adjacent Addressing Address Specified in a Local Command b[4:0] = XXX11 (b1b0 = 11, four bytes of data) b[4:0] = XXX10 (b1b0 = 10, three bytes of data) COMMAND TYPE AND FORMAT b[4:0] = XXX01 (b1b0 = 01, two bytes of data) The IDT821054 provides three types of commands as follows: Local Command (LC), which is used to address the local registers of the specified channel(s). Global Command (GC), which is used to address the global registers of all four channels. RAM Command (RC), which is used to address the coefficient RAM (Coe-RAM) and FSK-RAM. The format of the command is as the following: b7 R/W b6 b5 CT b4 b3 b2 b1 b[4:0] = XXX00 (b1b0 = 00, one byte of data) In/Out Data Bytes Address of the Local Registers to be accessed byte 1 byte 2 byte 3 byte 4 byte 1 byte 2 byte 3 byte 1 XXX11 XXX10 XXX01 XXX00 XXX10 XXX01 XXX00 XXX01 byte 2 XXX00 byte 1 XXX00 When addressing local registers, the procedure of consecutive adjacent addressing can be stopped by the CS signal at any time. If CS is changed from low to high, the operation to the current register and the next adjacent registers will be aborted. However, the previous operation results will not be affected. b0 Address 3.1.3 ADDRESSING THE GLOBAL REGISTERS For global registers are shared by all four channels, it is no need to specify the channel(s) before addressing a global register. Except for this, the global registers are addressed in a similar way as local registers. The procedure of consecutive adjacent addressing can be stopped by the CS signal at any time. Read/Write Command bit b7 = 0: Read Command b7 = 1: Write Command CT: Command Type b6 b5 = 00: LC - Local Command b6 b5 = 01: GC - Global Command b6 b5 = 10: Not Allowed b6 b5 = 11: RC - RAM Command Address: b[4:0], specify one or more local/global registers or a block of Coe-RAM or FSK-RAM to be addressed. For Local Command and Global Command, the b[4:0] bits are used to specify the address of the local registers and global registers respectively. For the RAM Command, b4 is used to distinguish the Coe-RAM and the FSK-RAM: b4 = 0: Command for addressing the Coe-RAM. The b[3:0] bits are used to address the blocks in the Coe-RAM. b4 = 1: Command for addressing the FSK-RAM. The b3 bit is always `0' and the b[2:0] bits are used to address the blocks in the FSKRAM. R/W: 3.1.2 INDUSTRIAL TEMPERATURE RANGE 3.1.4 ADDRESSING THE COE-RAM There are totally 40 words of Coe-RAM per channel. They are divided to 5 blocks. Each block consists of 8 words. Each word is 14-bit wide. The 5 blocks of the Coe-RAM are assigned for different filter coefficients as shown below (refer to "9 Appendix: IDT821054 Coe-RAM Mapping" for the address of the Coe-RAM): Block 1: IMF RAM (Word 0 - Word 7), containing the Impedance Matching Filter coefficient. Block 2: ECF RAM (Word 8 - Word 15), containing the Echo Cancellation Filter coefficient. Block 3: GIS RAM (Word 16 - Word 19) and Tone Generator RAM (Word 20 - Word 23), containing the Gain of Impedance Scaling and dual tone coefficients. Block 4: FRX RAM (Word 24 - Word 30) and GTX RAM (Word 31), containing the coefficient of the Frequency Response Correction in Transmit Path and the Gain in Transmit Path; ADDRESSING THE LOCAL REGISTERS When addressing the local registers, users must specify which channel(s) will be addressed first. If two or more channels are specified 17 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE CS signal is changed from low to high, the operation to the current word and the next adjacent words will be aborted. However, the previous operation results will not be affected. Block 5: FRR RAM (Word 32 - Word 38) and GRX RAM (Word 39), containing the coefficient of the Frequency Response Correction in Receive Path and the Gain in Receive Path. For the Coe-RAM is addressed on a per-channel basis, users should specify a channel (by setting the corresponding CE bit in GREG6 to `1') before writing/reading coefficients to/from the Coe-RAM. To write a Coe-RAM word, 16 bits (b[15:0]) or two 8-bit bytes are needed to fulfill with MSB first, but the lowest two bits (b[1:0]) will be ignored. When read, each word will output 16 bits with MSB first, but the lowest two bits (b[1:0]) are meaningless. The address in a Coe-RAM command (b[4:0]) specifies a block of Coe-RAM to be accessed. When a Coe-RAM command is executed, the CODEC automatically counts down from the highest address to the lowest address of the specified block. So all 8 words of the block will be addressed by one Coe-RAM command. When addressing the Coe-RAM, the procedure of consecutive adjacent addressing can be stopped by the CS signal at any time. If the 3.1.6 PROGRAMMING EXAMPLES 3.1.6.1 Example of Programming Local Registers INDUSTRIAL TEMPERATURE RANGE 3.1.5 ADDRESSING FSK-RAM The FSK-RAM consists of 4 blocks, and each block has 8 16-bit words. The total 32 words (i.e. 64 bytes) of FSK-RAM are shared by all four channels and only one channel can use it at one time. To write a FSK-RAM word, 16 bits (or, two 8-bit bytes) are needed to fulfill with MSB first. When being read, each FSK-RAM word in FSKRAM will output 16 bits with MSB first. When addressing the FSK-RAM, the b3 bit in a FSK-RAM Command should be `0' and the b4 bit should be `1', the b[2:0] bits specify one of the 4 blocks of FSK-RAM. Then, all 8 words of the specified block will be addressed automatically, with the highest order word first. * Writing to LREG2 and LREG1 of Channel 1: 1010, 0101 Channel Enable command 0001, 0010 Data for GREG6 (Channel 1 is enabled for programming) 1000, 0001 Local register write command (The address is '00001', which means that data will be written to LREG2 and LREG1.) xxxx, xxxx Data for LREG2 xxxx, xxxx Data for LREG1 * Reading from LREG2 and LREG1 of Channel 1: 1010, 0101 Channel Enable command 0001, 0010 Data for GREG6 (Channel 1 is enabled for programming) 0000, 0001 Local register read command (The address is '00001', which means that LREG2 and LREG1 will be read.) After the preceding commands are executed, data will be sent out as follows: 1000, 0001 Identification code xxxx, xxxx Data read out from LREG2 xxxx, xxxx Data read out from LREG1 3.1.6.2 Example of Programming Global Registers * Writing to GREG1: 1010, 0000 Global register write command (The address is '00000', which means that data will be written to GREG1.) 1111, 1111 Data for GREG1 * Reading from GREG1: 0010, 0000 Global register read command (The address is '00000', which means that GREG1 will be read.) After the preceding command is executed, data will be sent out as follows: 1000, 0001 Identification code 0000, 0001 Data read out from GREG1 3.1.6.3 Example of Programming the Coefficient-RAM * Writing to the Coe-RAM 1010,0101 Channel Enable command 0001,0010 Data for GREG6 (Channel 1 is enabled for programming) 1110,0010 Coe-RAM write command (The address of '00010' is located in block 3, which means that data will be written to block 3.) data byte 1 high byte of word 8 of block 3 data byte 2 low byte of word 8 of block 3 data byte 3 high byte of word 7 of block 3 data byte 4 low byte of word 7 of block 3 data byte 5 high byte of word 6 of block 3 data byte 6 low byte of word 6 of block 3 data byte 7 high byte of word 5 of block 3 data byte 8 low byte of word 5 of block 3 18 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE data byte 9 data byte 10 data byte 11 data byte 12 data byte 13 data byte 14 data byte 15 data byte 16 INDUSTRIAL TEMPERATURE RANGE high byte of word 4 of block 3 (see Note 1) low byte of word 4 of block 3 high byte of word 3 of block 3 low byte of word 3 of block 3 high byte of word 2 of block 3 low byte of word 2 of block 3 high byte of word 1 of block 3 low byte of word 1 of block 3 Note 1: In block 3 of the Coe-RAM, word 5 to word 8 are used for tone coefficients while word 1 to word 4 are used for GIS coefficients. If users do not want to change the GIS coefficient while writing tone coefficients to the Coe-RAM, they can stop the procedure of consecutive adjacent addressing (after writing data to word 5) by pulling the CS signal to high, or they can rewrite word 1 to word 4 with the original GIS coefficients. * Reading from the Coe-RAM 1010,0011 Channel Enable command 0001,0010 Data for GREG6 (Channel 1 is enabled for programming) 0110,0010 Coe-RAM read command (The address of '00010' is located in block 3, which means that block 3 will be read.) After the preceding commands are executed, data will be sent out as follows: 1000,0001 Identification code data byte 1 data read out from high byte of word 8 of block 3 data byte 2 data read out from low byte of word 8 of block 3 data byte 3 data read out from high byte of word 7 of block 3 data byte 4 data read out from low byte of word 7 of block 3 data byte 5 data read out from high byte of word 6 of block 3 data byte 6 data read out from low byte of word 6 of block 3 data byte 7 data read out from high byte of word 5 of block 3 data byte 8 data read out from low byte of word 5 of block 3 data byte 9 data read out from high byte of word 4 of block 3 data byte 10 data read out from low byte of word 4 of block 3 data byte 11 data read out from high byte of word 3 of block 3 data byte 12 data read out from low byte of word 3 of block 3 data byte 13 data read out from high byte of word 2 of block 3 data byte 14 data read out from low byte of word 2 of block 3 data byte 15 data read out from high byte of word 1 of block 3 data byte 16 data read out from low byte of word 1 of block 3 3.1.6.4 Example of Programming the FSK-RAM * Writing to the FSK-RAM: 1111,0010 FSK-RAM write command (The address of '010' is located in block 3, which means that data will be written to block 3.) data byte 1 high byte of word 8 of block 3 data byte 2 low byte of word 8 of block 3 data byte 3 high byte of word 7 of block 3 data byte 4 low byte of word 7 of block 3 data byte 5 high byte of word 6 of block 3 data byte 6 low byte of word 6 of block 3 data byte 7 high byte of word 5 of block 3 data byte 8 low byte of word 5 of block 3 data byte 9 high byte of word 4 of block 3 data byte 10 low byte of word 4 of block 3 data byte 11 high byte of word 3 of block 3 data byte 12 low byte of word 3 of block 3 data byte 13 high byte of word 2 of block 3 data byte 14 low byte of word 2 of block 3 data byte 15 high byte of word 1 of block 3 data byte 16 low byte of word 1 of block 3 * Reading from the FSK-RAM: 0111,0010 FSK-RAM read command (The address of '010' is located in block 3, which means that block 3 will be read.) After the preceding commands are executed, data will be sent out as follows: 1000,0001 Identification code 19 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE data byte 1 data byte 2 data byte 3 data byte 4 data byte 5 data byte 6 data byte 7 data byte 8 data byte 9 data byte 10 data byte 11 data byte 12 data byte 13 data byte 14 data byte 15 data byte 16 data read out from high byte of word 8 of block 3 data read out from low byte of word 8 of block 3 data read out from high byte of word 7 of block 3 data read out from low byte of word 7 of block 3 data read out from high byte of word 6 of block 3 data read out from low byte of word 6 of block 3 data read out from high byte of word 5 of block 3 data read out from low byte of word 5 of block 3 data read out from high byte of word 4 of block 3 data read out from low byte of word 4 of block 3 data read out from high byte of word 3 of block 3 data read out from low byte of word 3 of block 3 data read out from high byte of word 2 of block 3 data read out from low byte of word 2 of block 3 data read out from high byte of word 1 of block 3 data read out from low byte of word 1 of block 3 20 INDUSTRIAL TEMPERATURE RANGE IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 3.2 POWER-ON SEQUENCE 4. The master clock frequency is 2.048 MHz. 5. Transmit and receive time slots are set to be 0-3 respectively for Channel 1-4. The PCM data rate is as same as the BCLK frequency. The PCM data is transmitted on rising edges of the BCLK signal and received on falling edges of it. 6. A-Law is selected. 7. The digital filters including GRX, FRR, GTX, FRX, GIS, ECF and IMF are disabled. The high-pass filters (HPF) are enabled. Refer to Figure - 4 and descriptions on LREG1 for details. 8. The SB1, SB2 and SB3 pins are configured as inputs. 9. The SI1 and SI2 pins are configured as no debounce. 10.All interrupts are disabled and all pending interrupts are cleared. 11. All feature function blocks including FSK generator, dual tone generators, hardware ring trip and level meter are disabled. 12.The outputs of CHCLK1 and CHCLK2 are set to high. To power on the IDT821054, users should follow the sequence below: 1. Apply ground first; 2. Apply VCC, finish signal connections and set the RESET pin to logic low. The device then goes into the default state; 3. Set the RESET pin to logic high; 4. Select master clock frequency; 5. Program filter coefficients and other parameters as required; 3.3 INDUSTRIAL TEMPERATURE RANGE DEFAULT STATE AFTER RESET When the IDT821054 is powered on, or reset either by command or by setting the RESET pin to logic low for at least 50 s, the device will enter the default state as follows: 1. All four channels are powered down and in standby mode. 2. All loopbacks and cutoff are disabled. 3. The DX1 pin is selected for all channels to transmit data and the DR1 pin is selected for all channels to receive data. The data stored in the RAM will not be changed by any kind of reset operations. So the RAM data will not be lost unless the device is powered down physically. 21 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 3.4 REGISTERS DESCRIPTION 3.4.1 REGISTERS OVERVIEW INDUSTRIAL TEMPERATURE RANGE Table - 3 Global Registers (GREG) Mapping Name Function GREG1 Version number (read)/ no operation (write) Register Byte b7 b6 b5 b4 b3 b2 b1 b0 Read Write Command Command Default Value 20H A0H 01H GREG2 Interrupt clear - A1H - GREG3 Software reset - A2H - GREG4 Hardware reset - A3H - 24H A4H 00H GREG5 Chopper clock selection GREG6 GREG7 GREG8 GREG9 GREG10 GREG11 GREG12 Reserved CHclk2[1] CHclk2[0] CHclk1[3] CHclk1[2] CHclk1[1] CHclk1[0] MCLK selection and CE[3] CE[2] CE[1] channel program enable Data format, companding law, clock A- VDS CS[2] slope and PCM delay time selection SLIC ring trip setting OPI Reserved IPI and control Debounced data on SI1 SIB[3] SIB[2] SIB[1] and SI2 pins SB1 direction control SB1C[3] SB1C[2] SB1C[1] and SB1 data SB2 direction control SB2C[3] SB2C[2] SB2C[1] and SB2 data SB3 direction control SB3C[3] SB3C[2] SB3C[1] and SB3 data CE[0] Sel[3] Sel[2] Sel[1] Sel[0] 25H A5H 02H CS[1] CS[0] OC[2] OC[1] OC[0] 26H A6H 00H IS RTE OS[2] OS[1] OS[0] 27H A7H 00H SIB[0] SIA[3] SIA[2] SIA[1] SIA[0] 28H - 00H SB1C[0] SB1[3] SB1[2] SB1[1] SB1[0] 29H A9H 00H SB2C[0] SB2[3] SB2[2] SB2[1] SB2[0] 2AH AAH 00H SB3C[0] SB3[3] SB3[2] SB3[1] SB3[0] 2BH ABH 00H GREG13 FSK Flag Length FL[7] FL[6] FL[5] FL[4] FL[3] FL[2] FL[1] FL[0] 2CH ACH 00H GREG14 FSK Data Length DL[7] DL[6] DL[5] DL[4] DL[3] DL[2] DL[1] DL[0] 2DH ADH 00H GREG15 FSK Seizure Length SL[7] SL[6] SL[5] SL[4] SL[3] SL[2] SL[1] SL[0] 2EH AEH 00H GREG16 FSK Mark Length ML[7] ML[6] GREG17 FSK configuration GREG18 GREG19 GREG20 GREG21 GREG22 GREG23 Level meter result low byte Level meter result high byte Level meter count number level meter mode and channel selection, level meter enable Loopback control and PLL power down Over-sampling timing tuning Reserved ML[5] ML[4] ML[3] ML[2] ML[1] ML[0] 2FH AFH 00H FCS[1] FCS[0] FO BS MAS FS 30H B0H 00H LVLL[7] LVLL[6] LVLL[5] LVLL[4] LVLL[3] LVLL[2] LVLL[1] LVLL[0] 31H - 00H LVLH[7] LVLH[6] LVLH[5] LVLH[4] LVLH[3] LVLH[2] LVLH[1] LVLH[0] 32H - 00H CN[7] CN[6] CN[5] CN[4] CN[3] CN[2] CN[1] CN[0] 33H B3H 00H LMO L/C CS[1] CS[0] 34H B4H 00H DLB_8k DLB_DI ALB_DI 35H B5H 00H 37H B7H 00H Reserved Reserved PPD DLB_ANA ALB_8k 22 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE Table - 4 Local Registers (LREG) Mapping Name Function LREG1 Coefficient selection Register Byte b7 b6 b5 b4 b3 b2 b1 b0 CS[7] CS[6] CS[5] CS[4] CS[3] CS[2] CS[1] CS[0] IE[3] IE[2] IE[1] IE[0] GK[2] GK[1] GK[0] DSH[3] DSH[2] DSH[1] SO2 SO1 SB3 SB2 SB1 SI2 Read Write Default Value Command Command 00H 80H 08H 01H 81H 00H DSH[0] 02H 82H 00H SI1 03H 83H - Local loopbacks LREG2 control and SLIC input IE[4] interrupt enable DSH and GK LREG3 debounce filters GK[3] configuration SLIC IO status/control LREG4 Reserved data DLB_PCM ALB_1BIT DLB_1BIT 00H for CH1 01H for CH2 02H for CH3 03H for CH4 00H for CH1 01H for CH2 02H for CH3 03H for CH4 Transmit highway and LREG5 time slot selection THS TT[6] TT[5] TT[4] TT[3] TT[2] TT[1] TT[0] 04H 84H Receive highway and time slot selection RHS RT[6] RT[5] RT[4] RT[3] RT[2] RT[1] RT[0] 05H 85H LREG7 PCM data low byte PCM[7] PCM[6] PCM[5] PCM[4] PCM[3] PCM[2] PCM[1] PCM[0] 06H - 00H LREG8 PCM data high byte PCM[15] PCM[14] PCM[13] PCM[12] PCM[11] PCM[10] PCM[9] PCM[8] 07H - 00H PD PCMCT GAD GDA 0 0 0 0 08H 88H 80H 1 1 TEN1 TEN0 09H 89H 00H LREG6 Channel power down, LREG9 A/D and D/A gains, PCM cutoff Tone generator LREG10 enable and tone program enable Reserved 23 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE For the global and local registers described below, it should be noted that: 1. R/W = 0, Read command. R/W = 1, Write command. 2. The reserved bit(s) in the registers must be filled in `0' in write operation and be ignored in read operation. 3.4.2 GLOBAL REGISTERS LIST GREG1: No Operation, Write (A0H); Version Number, Read (20H) Command b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 1 0 0 0 0 0 By applying a read operation (20H) to this register, users can read out the version number of the IDT821054. The default value is 01H. To write to this register (no operation), a data byte of FFH must follow the write command (A0H) to ensure proper operation. GREG2: Interrupt Clear, Write Only (A1H) Command b7 b6 b5 b4 b3 b2 b1 b0 1 0 1 0 0 0 0 1 All interrupts on SLIC I/O will be cleared by applying a write operation to this register. Note that a data byte of FFH must follow the write command (A1H) to ensure proper operation. GREG3: Software Reset, Write Only (A2H) Command b7 b6 b5 b4 b3 b2 b1 b0 1 0 1 0 0 0 1 0 A write operation to this register resets all local registers, but does not reset global registers and RAM. Note that when writing to this register, a data byte of FFH must follow the write command (A2H) to ensure proper operation. GREG4: Hardware Reset, Write Only (A3) Command b7 b6 b5 b4 b3 b2 b1 b0 1 0 1 0 0 0 1 1 A write operation to this register is equivalent to setting the RESET pin to logic low (Refer to "3.3 Default State After Reset" on page 21 for details). Note that when applying this write command, a data byte of FFH must follow to ensure proper operation. GREG5: Chopper Clock Selection, Read/Write (24H/A4H) Command b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 1 0 0 1 0 0 Chclk2[1] Chclk2[0] Chclk1[3] Chclk1[2] Chclk1[1] Chclk1[0] I/O data Reserved This register is used to select the frequency of the CHclk2 and CHclk1 output signals. CHclk2[1:0] = 00: the output of chclk2 is set to high permanently (default); CHclk2[1:0] = 01: chclk2 outputs a digital signal with the frequency of 512 kHz; CHclk2[1:0] = 10: chclk2 outputs a digital signal with the frequency of 256 kHz; CHclk2[1:0] = 11: chclk2 outputs a digital signal with the frequency of 16384 kHz; CHclk1[3:0] = 0000: CHclk1[3:0] = 0001: CHclk1[3:0] = 0010: CHclk1[3:0] = 0011: CHclk1[3:0] = 0100: CHclk1[3:0] = 0101: CHclk1[3:0] = 0110: CHclk1[3:0] = 0111: the output of chclk1 is set to high permanently (default); chclk1 outputs a digital signal with the frequency of 1000/2 Hz; chclk1 outputs a digital signal with the frequency of 1000/4 Hz; chclk1 outputs a digital signal with the frequency of 1000/6 Hz; chclk1 outputs a digital signal with the frequency of 1000/8 Hz; chclk1 outputs a digital signal with the frequency of 1000/10 Hz; chclk1 outputs a digital signal with the frequency of 1000/12 Hz; chclk1 outputs a digital signal with the frequency of 1000/14 Hz; 24 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE CHclk1[3:0] = 1000: CHclk1[3:0] = 1001: CHclk1[3:0] = 1010: CHclk1[3:0] = 1011: CHclk1[3:0] = 1100: CHclk1[3:0] = 1101: CHclk1[3:0] = 1110: CHclk1[3:0] = 1111: INDUSTRIAL TEMPERATURE RANGE chclk1 outputs a digital signal with the frequency of 1000/16 Hz; chclk1 outputs a digital signal with the frequency of 1000/18 Hz; chclk1 outputs a digital signal with the frequency of 1000/20 Hz; chclk1 outputs a digital signal with the frequency of 1000/22 Hz; chclk1 outputs a digital signal with the frequency of 1000/24 Hz; chclk1 outputs a digital signal with the frequency of 1000/26 Hz; chclk1 outputs a digital signal with the frequency of 1000/28 Hz; the output of chclk1 is set to low permanently. GREG6: MCLK Selection and Channel Program Enable, Read/Write (25H/A5H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 0 1 0 1 I/O data CE[3] CE[2] CE[1] CE[0] Sel[3] Sel[2] Sel[1] Sel[0] The higher 4 bits (CE[3:0]) in this register are used to specify the desired channel(s) before addressing local registers or Coe-RAM. The CE[0] to CE[3] bits indicate the program enable state for Channel 1 to Channel 4 respectively. CE[0] = 0: Disabled, Channel 1 can not receive programming commands (default); CE[0] = 1: Enabled, Channel 1 can receive programming commands; CE[1] = 0: Disabled, Channel 2 can not receive programming commands (default); CE[1] = 1: Enabled, Channel 2 can receive programming commands; CE[2] = 0: Disabled, Channel 3 can not receive programming commands (default); CE[2] = 1: Enabled, Channel 3 can receive programming commands; CE[3] = 0: Disabled, Channel 4 can not receive programming commands (default); CE[3] = 1: Enabled, Channel 4 can receive programming commands. The lower 4 bits (Sel[3:0]) in this register are used to select the Master Clock frequency. Sel[3:0] = 0000: 8.192 MHz Sel[3:0] = 0001: 4.096 MHz Sel[3:0] = 0010: 2.048 MHz (default) Sel[3:0] = 0110: 1.536 MHz Sel[3:0] = 1110: 1.544 MHz Sel[3:0] = 0101: 3.072 MHz Sel[3:0] = 1101: 3.088 MHz Sel[3:0] = 0100: 6.144 MHz Sel[3:0] = 1100: 6.176 MHz GREG7: A/-law, Linear/Compressed Code, Clock Slope and Delay Time Selection, Read/Write (26H/A6H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 0 1 1 0 I/O data A- VDS CS[2] CS[1] CS[0] OC[2] OC[1] OC[0] The A/-law select bit (A-) selects the companding law: A- = 0: A-law is selected (default) A- = 1: -law is selected. The Voice Data Select bit (VDS) defines the format of the voice data: VDS = 0: Compressed code (default) VDS = 1: Linear code The Clock Slope bits (CS[2:0]) select single or double clock and clock edges of transmitting and receiving data. CS[2] = 0: Single clock (default) CS[2] = 1: Double clock CS[1:0] = 00: CS[1:0] = 01: transmits data on rising edges of BCLK, receives data on falling edges of BCLK (default). transmits data on rising edges of BCLK, receives data on rising edges of BCLK. 25 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE CS[1:0] = 10: CS[1:0] = 11: INDUSTRIAL TEMPERATURE RANGE transmits data on falling edges of BCLK, receives data on falling edges of BCLK. transmits data on falling edges of BCLK, receives data on rising edges of BCLK. The PCM data Offset Configuration bits (OC[2:0]) determine that the transmit and receive time slots of PCM data offset from the FS signal by how many periods of BCLK: OC[2:0] = 000: 0 period of BCLK (default); OC[2:0] = 001: 1 period of BCLK; OC[2:0] = 010: 2 periods of BCLK; OC[2:0] = 011: 3 periods of BCLK; OC[2:0] = 100: 4 periods of BCLK; OC[2:0] = 101: 5 periods of BCLK; OC[2:0] = 110: 6 periods of BCLK; OC[2:0] = 111: 7 periods of BCLK. GREG8: SLIC Ring Trip Setting and Control, Read/Write (27H/A7H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 0 1 1 1 I/O data OPI Reserved IPI IS RTE OS[2] OS[1] OS[0] The Output Polarity Indicator bit (OPI) indicates the valid polarity of output: OPI = 0: the selected output pin changes from low to high to activate the ring (default); OPI = 1: the selected output pin changes from high to low to activate the ring. The Input Polarity Indicator bit (IPI) indicates the valid polarity of input: IPI = 0: active low (default); IPI = 1: active high. The Input Selection bit (IS) determines which input will be selected as the off-hook indication signal source. IS = 0: SI1 is selected (default); IS = 1: SI2 is selected. The Ring Trip Enable bit (RTE) enables or disables the ring trip function block: RTE = 0: the ring trip function block is disabled (default); RTE = 1: the ring trip function block is enabled. The Output Selection bits (OS[2:0]) determine which output will be selected as the ring control signal source. OS[2:0] = 000 - 010: not defined; OS[2:0] = 011: SB1 is selected (when SB1 is configured as an output); OS[2:0] = 100: SB2 is selected (when SB2 is configured as an output); OS[2:0] = 101: SB3 is selected (when SB3 is configured as an output); OS[2:0] = 110: SO1 is selected; OS[2:0] = 111: SO2 is selected. GREG9: SI Data, Read Only (28H) b7 b6 b5 b4 b3 b2 b1 b0 Command 0 0 1 0 1 0 0 0 I/O data SIB[3] SIB[2] SIB[1] SIB[0] SIA[3] SIA[2] SIA[1] SIA[0] The SIA[3:0] bits contain the debounced data (off-hook status) on the SI1 pins of Channel 4 to Channel 1 respectively. The SIB[3:0] bits contain the debounced data (ground key status) on the SI2 pins of Channel 4 to Channel 1 respectively. 26 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE GREG10: SB1 Direction Control and SB1 Status/Control Data, Read/Write (29H/A9H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 0 0 1 I/O data SB1C[3] SB1C[2] SB1C[1] SB1C[0] SB1[3] SB1[2] SB1[1] SB1[0] The SB1 direction control bits SB1C[3:0] in this register determine the directions of the SB1 pins of Channel 4 to Channel 1 respectively. SB1C[0] = 0: the SB1 pin of Channel 1 is configured as input (default); SB1C[0] = 1: the SB1 pin of Channel 1 is configured as output; SB1C[1] = 0: the SB1 pin of Channel 2 is configured as input (default); SB1C[1] = 1: the SB1 pin of Channel 2 is configured as output; SB1C[2] = 0: the SB1 pin of Channel 3 is configured as input (default); SB1C[2] = 1: the SB1 pin of Channel 3 is configured as output; SB1C[3] = 0: the SB1 pin of Channel 4 is configured as input (default); SB1C[3] = 1: the SB1 pin of Channel 4 is configured as output. When the SB1 pins of Channel 1 to Channel 4 are configured as inputs, the SB1[0] to SB1[3] bits contain the status of these four SB1 pins respectively. When the SB1 pins of Channel 1 to Channel 4 are configured as outputs, the control data is written to these four SB1 pins via the SB1[0] to SB1[3] bits respectively. GREG11: SB2 Direction Control and SB2 Status/Control Data, Read/Write (2AH/AAH) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 0 1 0 I/O data SB2C[3] SB2C[2] SB2C[1] SB2C[0] SB2[3] SB2[2] SB2[1] SB2[0] The SB2 direction control bits SB2C[3:0] in this register determine the directions of the SB2 pins of Channel 4 to Channel 1 respectively. SB2C[0] = 0: the SB2 pin of Channel 1 is configured as input (default); SB2C[0] = 1: the SB2 pin of Channel 1 is configured as output; SB2C[1] = 0: the SB2 pin of Channel 2 is configured as input (default); SB2C[1] = 1: the SB2 pin of Channel 2 is configured as output; SB2C[2] = 0: the SB2 pin of Channel 3 is configured as input (default); SB2C[2] = 1: the SB2 pin of Channel 3 is configured as output; SB2C[3] = 0: the SB2 pin of Channel 4 is configured as input (default); SB2C[3] = 1: the SB2 pin of Channel 4 is configured as output. When the SB2 pins of Channel 1 to Channel 4 are configured as inputs, the SB2[0] to SB2[3] bits contain the status of these four SB2 pins respectively. When the SB2 pins of Channel 1 to Channel 4 are configured as outputs, the control data is written to these four SB2 pins via the SB2[0] to SB2[3] bits respectively. GREG12: SB3 Direction Control and SB3 Status/Control Data, Read/Write (2BH/ABH) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 0 1 1 I/O data SB3C[3] SB3C[2] SB3C[1] SB3C[0] SB3[3] SB3[2] SB3[1] SB3[0] The SB3 direction control bits SB3C[3:0] in this register determine the directions of the SB3 pins of Channel 4 to Channel 1 respectively. SB3C[0] = 0: the SB3 pin of Channel 1 is configured as input (default); SB3C[0] = 1: the SB3 pin of Channel 1 is configured as output; SB3C[1] = 0: the SB3 pin of Channel 2 is configured as input (default); SB3C[1] = 1: the SB3 pin of Channel 2 is configured as output; SB3C[2] = 0: the SB3 pin of Channel 3 is configured as input (default); SB3C[2] = 1: the SB3 pin of Channel 3 is configured as output; SB3C[3] = 0: the SB3 pin of Channel 4 is configured as input (default); SB3C[3] = 1: the SB3 pin of Channel 4 is configured as output. When the SB3 pins of Channel 1 to Channel 4 are configured as inputs, the SB3[0] to SB3[3] bits contain the status of these four SB3 27 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE pins respectively. When the SB3 pins of Channel 1 to Channel 4 are configured as outputs, the control data is written to these four SB3 pins via the SB3[0] to SB3[3] bits respectively. GREG13: FSK Flag Length, Read/Write (2CH/ACH) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 1 0 0 I/O data FL[7] FL[6] FL[5] FL[4] FL[3] FL[2] FL[1] FL[0] The flag signal is a stream of `1' which is transmitted between two message bytes during Caller-ID messages transmission. The Flag Length bits FL[7:0] determine the number of the flag bits. The flag length can be from 0 to 255 (d) bits. The default flag length is 0 (i.e. FL[7:0] = 00H), which means that no flag signal will be transmitted. GREG14: FSK Data Length, Read/Write (2DH/ADH) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 1 0 1 I/O data DL[7] DL[6] DL[5] DL[4] DL[3] DL[2] DL[1] DL[0] The Data Length bits DL[7:0] determine the number of the data bytes that will be transmitted except the flag signal. The data length can be from 0 to 64 (d) bytes. Any value larger than 64 (d) in this register will be taken as 64 (d) by the CODEC. The default data length is 0 (d), which means that no data bytes will be transmitted. GREG15: FSK Seizure Length, Read/Write (2EH/AEH) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 1 1 0 I/O data SL[7] SL[6] SL[5] SL[4] SL[3] SL[2] SL[1] SL[0] The Seizure Length is the number of `01' pairs that represent the seizure phase. The Seizure Length is two times of the value of the SL[7:0] bits. The value of the SL[7:0] bits can be from 0 to 255 (d), corresponding to Seizure Length of 0 to 510 (d). The default value is 0 (d), which means that no seizure signal will be transmitted. GREG16: FSK Mark Length, Read/Write (2FH/AFH) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 0 1 1 1 1 I/O data ML[7] ML[6] ML[5] ML[4] ML[3] ML[2] ML[1] ML[0] The Mark Length bits ML[7:0] determine the number of the mark bits of `1', which is transmitted in initial flag phase. The Mark Length can be from 0 to 255 (d). The default value is 0 (d), which means that no mark signal will be transmitted. GREG17: FSK Start, Mark After Send, BT/Bellcore Selection, FSK Channel Selection and FSK On/Off, Read/Write (30H/B0H) Command I/O data b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 1 1 0 0 0 0 FCS[1] FCS[0] FO BS MAS FS Reserved The FSK Channel Select bits (FCS[1:0]) select a channel on which the FSK signal is generated. FCS[1:0] = 00: Channel 1 is selected (default); FCS[1:0] = 01: Channel 2 is selected; FCS[1:0] = 10: Channel 3 is selected; FCS[1:0] = 11: Channel 4 is selected. The FSK On/Off bit (FO) enables or disables the FSK function block. FO = 0: The FSK function block is disabled (default); 28 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE FO = 1: INDUSTRIAL TEMPERATURE RANGE The FSK function block is enabled. The BT/Bellcore Select bit (BS) determines which specification the IDT821054 will follow: BS = 0: Bellcore specification is selected (default); BS = 1: BT specification is selected. The Mark After Send bit (MAS) determines if the FSK generator will keep on sending a mark-after-send signal (a stream of `1') after sending out all data in the FSK-RAM. MAS = 0: The output will be muted after all data in the FSK-RAM has been sent out (default); MAS = 1: The FSK generator keeps on sending out a mark-after-send signal after sending out all data in the FSK-RAM. If the MAS bit is set to `0' and the FS bit is set to `1', the mark-after-send signal will be stopped. The FSK Start bit (FS) should be set to `1' to start sending FSK signal. It will be automatically reset after all data in the FSK-RAM has been sent out. If the Seizure Length, Mark Length and Data Length are set to 0, the FS bit will be reset to `0' immediately after it is set to `1'. FS = 0: FSK transmission is disabled (default); FS = 1: FSK transmission starts. GREG18: Level Meter Result Low Byte, Read Only (31H) b7 b6 b5 b4 b3 b2 b1 b0 Command 0 0 1 1 0 0 0 1 I/O data LVLL[7] LVLL[6] LVLL[5] LVLL[4] LVLL[3] LVLL[2] LVLL[1] LVLL[0] This register contains the low byte of the level meter result. The default value is 00H. The LVLL[0] bit in this register will be set to `1' when the level meter result (both high and low bytes) is ready, and it will be reset to `0' immediately after the high byte of result is read. To read the level meter result, it is recommended to the low byte first, then read the high byte (LVLH[7:0] in GREG19). GREG19: Level Meter Result High Byte, Read Only (32H) b7 b6 b5 b4 b3 b2 b1 b0 Command 0 0 1 1 0 0 1 0 I/O data LVLH[7] LVLH[6] LVLH[5] LVLH[4] LVLH[3] LVLH[2] LVLH[1] LVLH[0] This register contains the high byte of the level meter result. The default value is 00H. GREG20: Level Meter Count Number, Read/Write (33H/B3H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 1 1 0 0 1 1 I/O data CN[7] CN[6] CN[5] CN[4] CN[3] CN[2] CN[1] CN[0] The CN[7:0] bits are used to set the number of time cycles for sampling the PCM data. CN[7:0] = 0 (d): the PCM data is output to the result registers GREG18 and GREG19 directly; CN[7:0] = N (d): the PCM data is sampled for N x 125 s (N is from 1 to 255). GREG21: Level Meter Channel and Linear/Compressed Mode Selection, Level Meter On/Off, Read/Write (34H/B4H) Command I/O data b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 1 1 0 1 0 0 LMO L/C CS[1] CS[0] Reserved The Level Meter On/Off bit (LMO) enables/disables the level meter. LMO = 0: The level meter is disabled (default); LMO = 1: The level meter is enabled. 29 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE The Linear/Compressed bit (L/C) determines the mode of level meter operation. L/C = 0: Message mode is selected. The compressed PCM data will be output to GREG19 transparently (default). L/C = 1: Metering mode is selected. The linear PCM data will be metered and the result will be output to the registers GREG18 and GREG19. The Level Meter Channel Select bits (CS[1:0]) select a channel, data on which will be level metered. CS[1:0] = 00: Channel 1 is selected (default); CS[1:0] = 01: Channel 2 is selected; CS[1:0] = 10: Channel 3 is selected; CS[1:0] = 11: Channel 4 is selected. GREG22: Global Loopback Control and PLL Power Down, Read/Write (35H/B5H) Command b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 1 1 0 1 0 1 PPD DLB_ANA ALB_8k DLB_8k DLB_DI ALB_DI I/O data Reserved The PLL Power Down bit (PPD) controls the operation state of the PLL block. PPD = 0: The PLL is disabled. The device is in normal operation state (default); PPD = 1: The PLL is powered down. The device works in power-saving mode. All clocks stop running. The Loop Control bits determine the loopback status. Refer to Figure - 4 on page 11 for detailed information. DLB_ANA = 0: The Digital Loopback via Analog Interface is disabled (default); DLB_ANA = 1: The Digital Loopback via Analog Interface is enabled. ALB_8k = 0: ALB_8k = 1: The Analog Loopback via 8 kHz Interface is disabled (default); The Analog Loopback via 8 kHz Interface is enabled. DLB_8k = 0: DLB_8k = 1: The Digital Loopback via 8 kHz Interface is disabled (default); The Digital Loopback via 8 kHz Interface is enabled. DLB_DI = 0: DLB_DI = 1: The Digital Loopback from DR to DX is disabled (default); The Digital Loopback from DR to DX is enabled. ALB_DI = 0: ALB_DI = 1: The Analog Loopback from DX to DR is disabled (default); The Analog Loopback from DX to DR is enabled. GREG23: Over-sampling Timing Tuning, Read/Write (37H/B7H) Command b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 1 1 0 1 1 1 To improve the performance of total distortion, it is recommended to write a data byte of 40H to this register. The default value is 00H. 30 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 3.4.3 INDUSTRIAL TEMPERATURE RANGE LOCAL REGISTERS LIST LREG1: Coefficient Selection, Read/Write (00H/80H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 0 0 0 0 I/O data CS[7] CS[6] CS[5] CS[4] CS[3] CS[2] CS[1] CS[0] The Coefficient Select bits (CS[7:0]) are used to control digital filters and function blocks on each channel. The digital filters include Impedance Matching Filter, Echo Cancellation Filter, High-Pass Filter, Gain for Impedance Scaling, Gain in the Transmit/Receive Path and Frequency Response Correction in the Transmit/Receive Path. See Figure - 4 on page 11 for details. It should be noted that the Impedance Matching Filter and Gain for Impedance Scaling are working together to adjust the impedance. So the CS[0] and CS[2] bits should be set to the same value to ensure proper operation. CS [7] = 0: The Digital Gain Filter in the Receive path (GRX) is disabled (default); CS [7] = 1: The Digital Gain in the Receive path (GRX) is programmed by the Coe-RAM. CS [6] = 0: The Frequency Response Correction filter in the Receive path (FRR) is disabled (default); CS [6] = 1: The coefficient of the Frequency Response Correction filter in the Receive path (FRR) is programmed by the Coe-RAM. CS [5] = 0: The Digital Gain Filter in the Transmit path (GTX) is disabled (default); CS [5] = 1: The Digital Gain in the Transmit path (GTX) is set by the Coe-RAM. CS [4] = 0: The Frequency Response Correction filter in the Transmit path (FRX) is disabled (default); CS [4] = 1: The coefficient of the Frequency Response Correction filter in the Transmit path (FRX) is programmed by the Coe-RAM. CS [3] = 0: The High-Pass Filter (HPF) is bypassed/disabled; CS [3] = 1: The High-Pass Filter (HPF) is enabled (default). CS [2] = 0: The Gain for Impedance Scaling filter (GIS) is disabled (default); CS [2] = 1: The coefficient of the Gain for Impedance Scaling filter (GIS) is programmed by the Coe-RAM. CS [1] = 0: The Echo Cancellation Filter (ECF) is disabled (default); CS [1] = 1: The coefficient of the Echo Cancellation Filter (ECF) is programmed by the Coe-RAM. CS [0] = 0: The Impedance Matching Filter (IMF) is disabled (default); CS [0] = 1: The coefficient of theImpedance Matching Filter (IMF) is programmed by the Coe-RAM. LREG2: Local Loopback Control and SLIC Input Interrupt Enable, Read/Write (01H/81H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 0 0 0 1 I/O data IE[4] IE[3] IE[2] IE[1] IE[0] DLB_PCM ALB_1BIT DLB_1BIT The SLIC Input Interrupt Enable bits IE[4:0] enable or disable the interrupt signal on each channel. IE[4] = 0: Interrupt disabled. The interrupt generated by changes of SB3 (when SB3 is selected as an input) will be ignored (default); IE[4] = 1: Interrupt enabled. The interrupt generated by changes of SB3 (when SB3 is selected as an input) will be recognized. IE[3] = 0: Interrupt disabled. The interrupt generated by changes of SB2 (when SB2 is selected as an input) will be ignored (default); IE[3] = 1: Interrupt enabled. The interrupt generated by changes of SB2 (when SB2 is selected as an input) will be recognized. IE[2] = 0: Interrupt disabled. The interrupt generated by changes of SB1 (when SB1 is selected as an input) will be ignored (default); IE[2] = 1: Interrupt enabled. The interrupt generated by changes of SB1 (when SB1 is selected as an input) will be recognized. IE[1] = 0: Interrupt disabled. The interrupt generated by changes of SI2 will be ignored (default); IE[1] = 1: Interrupt enabled. The interrupt generated by changes of SI2 will be recognized. IE[0] = 0: Interrupt disabled. The interrupt generated by changes of SI1 will be ignored (default); 31 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE IE[0] = 1: Interrupt enabled. The interrupt generated by changes of SI1 will be recognized. The Loopback Control Bits (DLB_PCM, ALB_1BIT and DLB_1BIT) determine the loopback status on the corresponding channel. Refer to Figure - 4 on page 11 for details. DLB_PCM = 0: Digital Loopback via Time Slots on the corresponding channel is disabled (default); DLB_PCM = 1: Digital Loopback via Time Slots on the corresponding channel is enabled. ALB_1BIT = 0: Analog Loopback via Onebit on the corresponding channel is disabled (default); ALB_1BIT = 1: Analog Loopback via Onebit on the corresponding channel is enabled; DLB_1BIT = 0: Digital Loopback via Onebit on the corresponding channel is disabled (default); DLB_1BIT = 1: Digital loopback via Onebit on the corresponding channel is enabled; LREG3: DSH and GK Debounce Filters Configuration, Read/Write (02H/82H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 0 0 1 0 I/O data GK[3] GK[2] GK[1] GK[0] DSH[3] DSH[2] DSH[1] DSH[0] The DSH Debounce bits DSH[3:0] are used to set the debounce time of SI1 input of the corresponding channel. DSH[3:0] = 0000: The debounce time is 0 ms (default); DSH[3:0] = 0001: The debounce time is 2 ms; DSH[3:0] = 0010: The debounce time is 4 ms; DSH[3:0] = 0011: The debounce time is 6 ms; DSH[3:0] = 0100: The debounce time is 8 ms; DSH[3:0] = 0101: The debounce time is 10 ms; DSH[3:0] = 0110: The debounce time is 12 ms; DSH[3:0] = 0111: The debounce time is 14 ms; DSH[3:0] = 1000: The debounce time is 16 ms; DSH[3:0] = 1001: The debounce time is 18 ms; DSH[3:0] = 1010: The debounce time is 20 ms; DSH[3:0] = 1011: The debounce time is 22 ms; DSH[3:0] = 1100: The debounce time is 24 ms; DSH[3:0] = 1101: The debounce time is 26 ms; DSH[3:0] = 1110: The debounce time is 28 ms; DSH[3:0] = 1111: The debounce time is 30 ms. The GK Debounce bits GK[3:0] are used to set the debounce interval of SI2 input of the corresponding channel. The debounce interval is programmable from 0 to 30 ms, corresponding to the minimal debounce time of 0 to 180 ms. GK[3:0] = 0000: The debounce interval is 0 ms (default); GK[3:0] = 0001: The debounce interval is 2 ms; GK[3:0] = 0010: The debounce interval is 4 ms; GK[3:0] = 0011: The debounce interval is 6 ms; GK[3:0] = 0100: The debounce interval is 8 ms; GK[3:0] = 0101: The debounce interval is 10 ms; GK[3:0] = 0110: The debounce interval is 12 ms; GK[3:0] = 0111: The debounce interval is 14 ms; GK[3:0] = 1000: The debounce interval is 16 ms; GK[3:0] = 1001: The debounce interval is 18 ms; GK[3:0] = 1010: The debounce interval is 20 ms; GK[3:0] = 1011: The debounce interval is 22 ms; GK[3:0] = 1100: The debounce interval is 24 ms; GK[3:0] = 1101: The debounce interval is 26 ms; GK[3:0] = 1110: The debounce interval is 28 ms; GK[3:0] = 1111: The debounce interval is 30 ms; 32 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE LREG4: Channel I/O Data, Read/Write (03H/83H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 0 0 1 1 I/O data Reserved SO2 SO1 SB3 SB2 SB1 SI2 SI1 The Channel I/O Data bits contain the information of the SLIC I/O pins (SI1, SI2, SB1, SB2, SB3, SO1 and SO2) of the corresponding channel. If SB1, SB2 and SB3 are configured as outputs, data can only be written to them by global registers GREG10, GREG11 and GREG12 respectively, and not by this register. LREG5: Transmit Timeslot and Transmit Highway Selection, Read/Write (04H/84H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 0 1 0 0 I/O data THS TT[6] TT[5] TT[4] TT[3] TT[2] TT[1] TT[0] The Transmit Time Slot Bits TT[6:0] select a time slot (compressed code) or a time slot group (linear code) for the corresponding channel to transmit the PCM data. The valid value is from 0 to 127(d), corresponding to TS0 to TS127. The default value is 0 (d). The Transmit Highway Selection bit THS selects a PCM highway for the corresponding channel to transmit the PCM data. THS = 0: DX1 is selected (default); THS = 1: DX2 is selected. LREG6: Receive Timeslot and Receive PCM Highway Selection, Read/Write (05H/85H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 0 1 0 1 I/O data RHS RT[6] RT[5] RT[4] RT[3] RT[2] RT[1] RT[0] The Receive Time Slot Bits RT[6:0] select a time slot (compressed code) or a time slot group (linear code) for the corresponding channel to receive the PCM data. The valid value is from 0 to 127(d), corresponding to TS0 to TS127. The default value is 0 (d). The Receive Highway Selection bit RHS selects a PCM highway for the corresponding channel to receive the PCM data. RHS = 0: DR1 is selected (default); RHS = 1: DR2 is selected. LREG7: PCM Data Low Byte, Read Only (06H) b7 b6 b5 b4 b3 b2 b1 b0 Command 0 0 0 0 0 1 1 0 I/O data PCM[7] PCM[6] PCM[5] PCM[4] PCM[3] PCM[2] PCM[1] PCM[0] This register is used for MCU to monitor the transmit (A to D) PCM data. For linear code, this register contains the low byte of the transmit PCM data and LREG8 contains the high byte of the transmit PCM data. For compressed code (A/-Law), this register contains total 8 bits of the transmit PCM data. The low byte or total 8 bits of transmit PCM data will be read out by applying a read command to this register, and at the same time, it will be transmitted to the PCM highway without any interference. LREG8: PCM Data High Byte, Read Only (07H) b7 b6 b5 b4 b3 b2 b1 b0 Command 0 0 0 0 0 1 1 1 I/O data PCM[15] PCM[14] PCM[13] PCM[12] PCM[11] PCM[10] PCM[9] PCM[8] This register is used for MCU to monitor the transmit (A to D) PCM data. For linear code, this register contains the high byte of the 33 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE transmit PCM data. For compressed code (A/-Law), this register is not used (when being read, it will output a data byte of 00H). The high byte of transmit PCM data will be read out by applying a read command to this register, and at the same time, it will be transmitted to the PCM highway without any interference. LREG9: A/D Gain, D/A Gain, Channel Power Down and PCM Receive Path Cutoff, Read/Write (08H/88H) b7 b6 b5 b4 b3 b2 b1 b0 Command R/W 0 0 0 1 0 0 0 I/O data PD PCMCT GAD GDA 0 0 0 0 The Channel Power Down bit (PD) selects the operation mode for the corresponding channel: PD = 0: The corresponding channel is in normal operation state; PD = 1: The corresponding channel is powered down (default). The PCMCT bit determines the operation of PCM Receive Path of the corresponding channel: PCMCT = 0: The PCM Receive Path of the corresponding channel is in normal operation state (default); PCMCT = 1: The PCM Receive Path of the corresponding channel is cut off. The A/D Gain bit (GAD) sets the gain of analog A/D for the corresponding channel: GAD = 0: 0 dB (default); GAD = 1: +6 dB. The D/A Gain bit (GDA) sets the gain of analog D/A for the corresponding channel: GDA = 0: 0 dB (default); GDA = 1: -6 dB. Attention: To ensure proper operation, the lower 4 bits of the I/O data byte following the write command (88H) must be '0000'. LREG10: Tone Generator Enable, Read/Write (09H/89H) Command I/O data b7 b6 b5 b4 b3 b2 b1 b0 R/W 0 0 0 1 0 0 1 1 1 TEN1 TEN0 Reserved TEN1 = 0: TEN1 = 1: Tone generator 1 is disabled (default); Tone generator 1 is enabled. TEN0 = 0: TEN0 = 1: Tone generator 0 is disabled (default); Tone generator 0 is enabled. Attention: To ensure proper operation, the b3 and b2 of the I/O data byte following the write command (89H) must be `11'. 34 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 4 INDUSTRIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS Ratings Min. Power supply voltage Voltage on Any Pin with respect to ground -0.5 Package power dissipation Storage temperature -65 Max. Unit 6.5 V 5.5 V 1.5 W +150 C Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 5 RECOMMENDED DC OPERATING CONDITIONS Parameter Min. Max. Unit Operating temperature -40 +85 C Power supply voltage 4.75 5.25 V Note: MCLK: 1.536 MHz, 1.544 MHz, 2.048 MHz, 3.072 MHz, 3.088 MHz, 4.096 MHz, 6.144 MHz, 6.176 MHz or 8.192 MHz with tolerance of 50 ppm. 6 ELECTRICAL CHARACTERISTICS 6.1 DIGITAL INTERFACE Parameter Description VIL Input low voltage VIH Input high voltage VOL Output low voltage VOH Output high voltage II Min. Typ. Max. Units 0.8 V All digital inputs V All digital inputs V DX, IL = 8 mA, All other digital outputs, IL = 4 mA V DX, IL = -8 mA, All other digital outputs, IL = -4 mA 2.0 0.8 VDD - 0.6 Test Conditions Input current -10 10 A All digital inputs, GND<VIN<VDD IOZ Output current in high-impedance state -10 10 A DX CI Input capacitance 5 pF Max. Units 6.2 POWER DISSIPATION Parameter Description IDD1 Operating current IDD0 Standby current Min. Typ. 50 6 Note: Power measurements are made at MCLK = 2.048MHz, outputs unloaded. 35 Test Conditions mA All channels are active. mA All channels are powered down, with MCLK present. IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 6.3 INDUSTRIAL TEMPERATURE RANGE ANALOG INTERFACE Parameter Description Min. Typ. Max. Units 2.4 2.6 V VOUT1 Output voltage, VOUT 2.25 VOUT2 Output voltage swing, VOUT 3.25 RI Input resistance, VIN RO Output resistance, VOUT RL Load resistance, VOUT CL Load capacitance, VOUT 30 40 Alternating zero, -law PCM code applied to DR Vp-p RL = 300 60 k 0.25 V < VIN < 4.75 V 20 0 dBm0, 1020 Hz PCM code applied to DR External loading pF External loading 300 100 36 Test Conditions IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 7 INDUSTRIAL TEMPERATURE RANGE TRANSMISSION CHARACTERISTICS 0 dBm0 is defined as 0.775 Vrms for A-law and 0.769 Vrms for -law, both for 600 load. Unless otherwise noted, the analog input is a 0 dBm0, 1020 Hz sine wave; the input amplifier is set for unity gain. The digital input is a PCM bit stream equivalent to that obtained by passing a 0 dBm0, 1020 Hz sine wave through an ideal encoder. The output level is sin(x)/x-corrected. Typical values are for VDD = +5 V and TA = 25C. 7.1 ABSOLUTE GAIN Parameter Description Min. Typ. Max. Units Test Conditions GXA Transmit gain, absolute -0.25 0.25 dB Signal output of 0 dBm0, -law or A-law GRA Receive gain, absolute -0.25 0.25 dB Measured relative to 0 dBm0, -law or A-law, PCM input of 0 dBm0, 1020 Hz. RL = 10 k. 7.2 GAIN TRACKING Parameter Min. Transmit gain tracking +3 dBm0 to -37 dBm0 (exclude -37 dBm0) -37 dBm0 to -50 dBm0 (exclude -50 dBm0) -50 dBm0 to -55 dBm0 Receive gain tracking +3 dBm0 to -40 dBm0 (exclude -40 dBm0) -40 dBm0 to -50 dBm0 (exclude -50 dBm0) -50 dBm0 to -55 dBm0 GTX GTR 7.3 Description Typ. Max. Units -0.25 -0.50 -1.40 0.25 0.50 1.40 dB dB dB -0.10 -0.25 -0.50 0.10 0.50 0.50 dB dB dB Test Conditions Tested by sinusoidal method, A-law or -law. Tested by sinusoidal method, A-law or -law. FREQUENCY RESPONSE Parameter GXR GRR Description Transmit gain, relative to GXA f = 50 Hz f = 60 Hz f = 300 Hz f = 300 to 3000 Hz (exclude 3000 Hz) f = 3000 Hz to 3400 Hz f = 3600 Hz f 4600 Hz Receive gain, relative to GRA f < 300 Hz f = 300 to 3000 Hz (exclude 3000 Hz) f = 3000 Hz to 3400 Hz f = 3600 Hz f 4600 Hz Min. Typ. -0.10 -0.15 -0.60 -0.15 -0.60 37 Max. Units -30 -30 0.20 0.15 0.15 -0.10 -35 dB dB dB dB dB dB dB 0 0.15 0.15 -0.20 -35 dB dB dB dB dB Test Conditions The high-pass filter is enabled. IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 7.4 INDUSTRIAL TEMPERATURE RANGE GROUP DELAY Parameter DXR DRR 7.5 Description Min. Typ. Transmit delay, relative to 1800 Hz f = 500 to 600 Hz f = 600 to 1000 Hz f = 1000 to 2600 Hz f = 2600 to 2800 Hz Receive delay, relative to 1800 Hz f = 500 to 600 Hz f = 600 to 1000 Hz f = 1000 to 2600 Hz f = 2600 to 2800 Hz Max. Units 280 150 80 280 s s s s 50 80 120 150 s s s s Max. Units Test Conditions DISTORTION Parameter STDX STDR Description Transmit signal to total distortion ratio A-law: input level = 0 dBm0 input level = -30 dBm0 input level = -40 dBm0 input level = -45 dBm0 -law: input level = 0 dBm0 input level = -30 dBm0 input level = -40 dBm0 input level = -45 dBm0 Receive signal to total distortion ratio A-law: input level = 0 dBm0 input level = -30 dBm0 input level = -40 dBm0 input level = -45 dBm0 -law: input level = 0 dBm0 input level = -30 dBm0 input level = -40 dBm0 input level = -45 dBm0 Min. Typ. 36 36 30 24 dB dB dB dB 36 36 31 27 dB dB dB dB 36 36 30 24 dB dB dB dB 36 36 31 27 dB dB dB dB SFDX Single frequency distortion, transmit -42 dBm0 SFDR Single frequency distortion, receive -42 dBm0 IMD Intermodulation distortion -42 dBm0 38 Test Conditions ITU-T O.132 Sine wave method, psophometrically weighted for A-law and C-message weighted for -law. ITU-T O.132 Sine wave method, psophometrically weighted for A-law and C-message weighted for -law. 200 to 3400 Hz, 0 dBm0 input, output any other single frequency 3400 Hz 200 to 3400 Hz, 0 dBm0 input, output any other single frequency 3400 Hz Transmit or receive, two frequencies in the range of 300 to 3400 Hz at -6 dBm0 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 7.6 INDUSTRIAL TEMPERATURE RANGE NOISE Parameter Description Min. Typ. Max. Units Test Conditions NXC Transmit noise, C-message weighted for -law 15 dBrnC0 NXP Transmit noise, psophometrically weighted for A-law -70 dBm0p NRC Receive noise, C-message weighted for -law 10 dBrnC0 NRP Receive noise, psophometrically weighted for A-law -80 dBm0p -53 dBm0 VIN = 0 Vrms, tested at VOUT 40 25 dB dB VDD = 5.0 VDC+100 mVrms 40 25 dB dB Noise, single frequency f = 0 kHz to 100 kHz Power supply rejection, transmit f = 300 Hz to 3.4 kHz f = 3.4 kHz to 20 kHz Power supply rejection, receive f = 300 Hz to 3.4 kHz f = 3.4 kHz to 20 kHz Spurious out-of-band signals at VOUT, relative to input PCM code applied: f = 4.6 kHz to 20 kHz f = 20 kHz to 50 kHz NRS PSRX PSRR SOS 7.7 -40 -30 dB dB VDD = 5.0 VDC+100 mVrms, PCM code is positive one LSB 0 dBm0, 300 Hz to 3400 Hz input INTERCHANNEL CROSSTALK Parameter Description Min. Typ. Max. Units XTX-R Transmit to receive crosstalk -85 -78 dB XTR-X Receive to transmit crosstalk -85 -80 dB XTX-X Transmit to transmit crosstalk -85 -78 dB XTR-R Receive to receive crosstalk -85 -80 dB Typ. Max. Units 7.8 Test Conditions 300 Hz to 3400 Hz, 0 dBm0 signal into VIN of the interfering channel. Idle PCM code into the channel under test. 300 Hz to 3400 Hz, 0 dBm0 PCM code into the interfering channel. VIN = 0 Vrms for the channel under test. 300 Hz to 3400 Hz, 0 dBm0 signal into VIN of the interfering channel. VIN = 0 Vrms for the channel under test. 300 Hz to 3400 Hz, 0 dBm0 PCM code into the interfering channel. Idle PCM code into the channel under test. INTRACHANNEL CROSSTALK Parameter Description Min. Test Conditions XTX-R Transmit to receive crosstalk -80 -70 dB 300 Hz to 3400 Hz, 0 dBm0 signal into VIN. Idle PCM code into DR. XTR-X Receive to transmit crosstalk -80 -70 dB 300 Hz to 3400 Hz, 0 dBm0 PCM code into DR. VIN = 0 Vrms. Note: Crosstalk into transmit channels (VIN) can be significantly affected by parasitic capacitive coupling from VOUT outputs. PCB layouts should be arranged to minimize the parasitics. 39 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 8 TIMING CHARACTERISTICS 8.1 CLOCK TIMING Symbol Description Min. Typ. INDUSTRIAL TEMPERATURE RANGE Max. Units 100k ns t1 CCLK period 122 t2 CCLK pulse width 48 t3 CCLK rise and fall time t4 BCLK period 122 ns t5 BCLK pulse width 48 ns t6 BCLK rise and fall time t7 MCLK pulse width t8 MCLK rise and fall time ns 25 ns 15 ns 48 ns 15 t2 ns t1 CCLK t3 t3 t2 t6 t6 t5 t8 t8 t7 t5 t4 BCLK t7 MCLK Figure - 8 Clock Timing 40 Test Conditions IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 8.2 INDUSTRIAL TEMPERATURE RANGE MICROPROCESSOR INTERFACE TIMING Symbol t11 Description Min. CS setup time Typ. Max. Units 15 ns 8 n t1 (n 2) t12 CS pulse width ns t13 CS off time 250 ns t14 Input data setup time 30 ns t15 Input data hold time 30 ns t16 SLIC output latch valid t17 Output data turn on delay t18 Output data hold time t19 Output data turn off delay t20 output data valid 1000 ns 50 ns 0 ns 0 50 ns 50 ns CCLK t11 t14 t13 t12 CS t15 CI t16 SLIC Output Figure - 9 MPI Input Timing CCLK t12 t13 t11 CS t17 t18 t20 t19 CO Figure - 10 MPI Output Timing 41 Test Conditions IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 8.3 INDUSTRIAL TEMPERATURE RANGE PCM INTERFACE TIMING Symbol Description Min. Typ. Max. Units t21 Data enable delay time 5 70 ns t22 Data delay time from BCLK 5 70 ns t23 Data float delay time 5 70 ns t24 Frame sync setup time 25 t4 - 50 ns t25 Frame sync hold time 50 t26 TSX1 or TSX2 enable delay time 5 80 ns t27 TSX1 or TSX2 disable delay time 5 80 ns t28 Receive data setup time 25 ns t29 Receive data hold time 5 ns Test Conditions ns Time Slot BCLK 1 2 t24 3 4 5 6 7 8 1 t25 FS t23 t22 t21 DX1/ DX2 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 1 BIT 7 BIT 8 t29 t28 DR1/ DR2 BIT 6 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 t26 t27 TSX1 / TSX2 Note: This timing diagram only applies to the situation of receiving data on falling edges and transmitting data on rising edges. Figure - 11 Transmit and Receive Timing Time Slot 27 28 29 30 31 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 FS DX1/DX2 DR1/DR2 X0 X1 R0 X2 R1 X3 R2 TSX1 / TSX2 Figure - 12 Typical Frame Sync Timing (2 MHz Operation) 42 R3 25 26 IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 9 INDUSTRIAL TEMPERATURE RANGE APPENDIX: IDT821054 COE-RAM MAPPING Channel4 Block # 5 4 3 2 1 Word # Channel3 b[2:0] of a Coe-RAM Command 39 100 32 31 24 23 16 15 8 7 0 Channel2 Channel1 GRX RAM FRR RAM 011 GTX RAM FRX RAM 010 TONE RAM GIS RAM 001 ECF RAM 000 IMF RAM Figure - 13 Coe-RAM Mapping Generally, 6 bits of address are needed to locate each word of the 40 Coe-RAM words. In the IDT821054, the 40 words of Coe-RAM are divided into 5 blocks with 8 words per block, so, only 3 address bits are needed to locate each of the block. When the address of a Coe-RAM block (b[2:0]) is specified in a Coe-RAM command, all 8 words of this block will be addressed automatically, with the highest order word first (The IDT821054 will count down from '111' to '000' so that it accesses the 8 words successively). Refer to "3.1.4 Addressing the Coe-RAM" for details. The address assignment for the 40 words of Coe-RAM is as shown in Table - 5. The number in the "Address" column is the actual address of each Coe-RAM word. As the IDT821054 handles the lower 3 bits of address automatically, only the higher 3 bits of address (in bold style) are needed for a Coe-RAM Command. It should be noted that, when addressing the GRX RAM, the FRR RAM will be addressed at the same time. Table - 5 Coe-RAM Address Allocation Block # Word # 5 4 3 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 Address Function 100,111 100,110 100,101 100,100 100,011 100,010 100,001 100,000 011,111 011,110 011,101 011,100 011,011 011,010 011,001 011,000 010,111 010,110 010,101 010,100 GRX RAM Block # Word # 3 FRR RAM 2 GTX RAM FRX RAM Amplitude Coefficient of Tone Generator 1 Frequency Coefficient of Tone Generator 1 Amplitude Coefficient of Tone Generator 0 Frequency Coefficient of Tone Generator 0 43 1 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Address 010,011 010,010 010,001 010,000 001,111 001,110 001,101 001,100 001,011 001,010 001,001 001,000 000,111 000,110 000,101 000,100 000,011 000,010 000,001 000,000 Function GIS RAM ECF RAM IMF RAM IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE 10 INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XXXXXX Dev ice Ty pe XXX X Package Process/ Temperature Range 44 Blank Industrial (-40 C to +85 C) PQF Plastic Quad Flat Pack (PQFP, PM64) 821054 Quad Programmable PCM CODEC IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE DATA SHEET DOCUMENT HISTORY 12/21/2001 01/03/2002 01/23/2002 02/19/2002 10/30/2002 01/10/2003 02/20/2003 02/26/2003 pgs. 8, 22, 26, 27 pg. 24 pgs. 1, 2, 5, 7, 11, 15, 21 pg. 27 pgs. 14, 21, 22, 25, 27 pgs. 8, 11, 16, 23, 44 pg. 37 pg. 13 CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 45 for Tech Support: email: telecomhelp@idt.com phone: 408-330-1552