10/100 Mb/s Ethernet Products
DP83620
Ethernet Physical Layer Transceiver
Demo Board User Guide
Interface Division
April 21, 2011
Document Revision A
Table of Contents
1 General Description .................................................................................................................. 1
2 Quick Start ................................................................................................................................ 2
2.1 Power Connection ...................................................................................................... 2
2.1.1 MII Interface (Default) ................................................................................................ 2
2.1.2 USB Interface ............................................................................................................. 2
2.1.3 External Supply .......................................................................................................... 2
2.2 Address Setting .......................................................................................................... 3
2.3 Device Register Access ............................................................................................. 4
2.3.1 Access MDIO Through MII ........................................................................................ 4
2.3.2 Access MDIO Through USB ...................................................................................... 4
2.3.3 Access MDIO Through Parallel Port .......................................................................... 4
2.4 Clock Sources ............................................................................................................ 5
2.4.1 Crystal (Default) ......................................................................................................... 5
2.4.2 Oscillator .................................................................................................................... 5
2.5 Straps ......................................................................................................................... 6
2.6 LEDs .......................................................................................................................... 7
2.7 SMA Connectors ........................................................................................................ 8
2.8 Table of Jumpers ....................................................................................................... 8
2.9 Modification for Fiber Operation ................................................................................ 9
2.10 Register Access Software .......................................................................................... 9
1
DP83620 DEMO BOARD USER GUIDE
1 General Description
The purpose of the DP83620 Demo Board is to provide National Semiconductor Corp.'s
customers with a vehicle to quickly design and market systems containing the DP83620.
Customers are encouraged to copy EVK components to expedite their design process.
The EVK contains:
• DP83620 Demo Board
• USB cable
• Cover letter
• DP83620 Demo licensing agreement
Links to the EVK design files and this User Guide can be found via the DP83620 product folder
on the National Semiconductor website (www.national.com).
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DP83620 DEMO BOARD USER GUIDE
2 Quick Start
The DP83620 Demo Board is fully assembled and factory tested. Follow the instructions below to
set up the hardware platform for the measurement of interest.
2.1 Power Connection
The DP83620 Demo Board provides several options for supplying power to the board. Power
can be supplied by way of the MII interface at 3.3 V or 5.0 V, USB interface, or directly from an
external supply.
2.1.1 MII Interface (Default)
To allow the board to be supplied by the MII interface a 0 ohm resistor must be inserted at R139.
Placing the jumper between J11 and pin 2 of J12 will connect the 3.3 V power plane to the MII
3.3V supply. In the case of an MII interface that supplies 5.0 V, an on board 3.3 V regulator is
provided and no jumper should be placed on J55. For a 3.3 V MII supply, a jumper should be
placed on J55 to bypass the regulator. In both cases, LED D2 will illuminate if a voltage is
available at J11. The following image shows the default jumper configuration.
Figure 1. Default Power Supply Connection
2.1.2 USB Interface
To supply the device using the USB interface, a jumper should be placed between pins 2 and 3 of
J12.
2.1.3 External Supply
The board can be supplied from an external supply by removing the jumper on J12 and
connecting the external 3.3 V supply directly to pin 2 of J12. Ground can be connected to one of
the GND pins on the board.
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DP83620 DEMO BOARD USER GUIDE
2.2 Address Setting
The PHY address can be set by placing jumpers in J24 and J26 as indicated in Table 1. Placing
2.2k ohm resistors in R47, R49, and R50 will pull PHYAD2, PHYAD3, and PHYAD4 high allowing
for PHY addresses greater than 3. The default address is 1 (no jumpers or resistors placed).
Table 1. PHY Address Settings
PHYAD1 (J26)
PHYAD0 (J24)
PHY Address
Open
Jumpered
0
Open
Open
1 (Default)
Jumpered
Jumpered
2
Jumpered
Open
3
Figure 2. Default PHY Address Setting
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DP83620 DEMO BOARD USER GUIDE
2.3 Device Register Access
2.3.1 Access MDIO Through MII
To access the device registers through the MII interface jumpers should be placed between pins
1 and 2 of J3 and J4. Figure 3 shows the default jumper settings for the MDIO/MDC access via
the MII interface.
Figure 3. Default MDIO/MDC Connection
2.3.2 Access MDIO Through USB
To access the device registers through the USB interface jumpers should be placed between pins
2 and 3 of J3 and J4.
2.3.3 Access MDIO Through Parallel Port
To access the device registers through the parallel port of the PC, the jumpers on J3 and J4 must
be removed. Figure 4 shows the connection between the parallel port and the device signals:
MDIO (J4, 2), MDC (J3, 2), and GND (J22, 1).
Figure 4. Direct Connect Cable with Line Resistors
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DP83620 DEMO BOARD USER GUIDE
2.4 Clock Sources
The board can be configured to operate with either a crystal or an external oscillator.
2.4.1 Crystal (Default)
The board comes with a 25 MHz crystal for use in the MII configuration. A surface mount device
using the pads provided on the bottom side of the board can replace the through-hole part.
2.4.2 Oscillator
To use the board with a 25 MHz oscillator, remove the crystal (Y2) and resistors R22 and R25,
populate the oscillator (X1) and R27 with a 0 ohm resistor. The board will accept oscillators in
both full and half can package sizes.
For Reduced MII mode, two modes of operation are supported (RMII Master Mode and RMII
Slave Mode). For RMII Master Mode, the DP83620 internally generates the 50 MHz RMII
reference clock from the 25 MHz XTAL. For RMII Slave Mode operation, an external 50 MHz
oscillator must provide the reference to the X1 input of the DP83620. Refer to the DP83620
datasheet for details on configuring the device for RMII Master and Slave Modes.
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DP83620 DEMO BOARD USER GUIDE
2.5 Straps
The DP83620 Demo Board provides a combination of jumpers and resistors to configure the
strap options for the device. The following table summarizes the straps and the default settings.
Table 2. Strap Settings
Jumper
Signal Name
IC Pin Name
Function
Default Setting
J23
MII_MODE
RX_DV
MII Mode Select
Open
J29
RMII_MAS
TXD_3
RMII Master Enable
Open
J25
LED_CFG
CRS/CRS_DV
LED Configuration
Open
J32
CLK_OUT_EN
CLK_OUT_EN
CLK_OUT Enable
Open
J35
PCF_EN
PCF_EN
PHY Control Frame Enable
Open
J33
ACT
LED_ACT
Sets Mode in Auto Negotiation
High
J36
SPEED
LED_SPEED
Sets Mode in Auto Negotiation
High
J39
LINK
LED_LINK
Auto-Negotiation Enable
High
R46
FX_EN_Z
RX_ER
Fiber Mode Enable
Open
PHY Address
J24
PHYAD0
COL
PHY Address Bit 0
Open
J26
PHYAD1
RXD_3
PHY Address Bit 1
Open
R47
PHYAD2
RXD_2
PHY Address Bit 2
Open
R49
PHYAD3
RXD_1
PHY Address Bit 3
Open
R50
PHYAD4
RXD_0
PHY Address Bit 4
Open
Refer to the DP83620 datasheet for specific details related to each strap option. The position of
the default strap settings are indicated below for each version of the board.
Figure 5. Default Strap Locations
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DP83620 DEMO BOARD USER GUIDE
2.6 LEDs
Various LEDs are provided to assist the user in determining the state of operation of the board.
Table 3 and Figure 6 clarify the relationship between the LEDs and Jumpers.
Table 3. List of LEDs with Jumpers
LED
Associated Jumper
Function
D1
Interrupt Indication
D2
MII Power Supply Indication
D13 / D33
J42
Reserved
D10 / D30
J39
Link
D7 /D27
J36
Speed
D4 / D24
J33
Activity
D12 / D32
J41
Reserved
D9 / D29
J38
Reserved
D6 / D26
J35
Phy Control Frame Enable
D3 / D23
J32
Clock Out Enable
Figure 6. LED/Jumper Order
LEDs D3 through D33 can be used to indicate the state of the Phy. When it is desired that the
LED is “ON” when the signal is “LOW”, the associated jumper should be set to the “UP” state.
With this setting a GREEN LED will be illuminated. When it is desired that the LED is “ON” when
the signal is “HIGH”, the associated jumper should be set to the “DN” state. In this case, an
AMBER LED has been incorporated in the circuit. Care should be taken when selecting the
LED polarity of the signals which also function as strap inputs.
For additional information about the functionality of pins connected to the LEDs (with the
exception of D2), refer to the DP83620 datasheet.
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DP83620 DEMO BOARD USER GUIDE
2.7 SMA Connectors
For convenience, SMA connector J2 is provided to allow connection to the CLK_OUT pin. J2 can
be connected to the CLK_OUT pin by placing a 0 ohm resistor at R1. A 50 ohm resistor can be
placed at R2 to provide a terminating impedance for test equipment, if desired. J34 is unused
and reserved.
2.8 Table of Jumpers
Table 4. List of Jumpers
Jumper
Name
Function
Default
Setting
Power
J11/J12
Selects device 3.3 V source (Default MII_3V3)
J55
MII 5V/3V3
Bypasses 3.3 V regulator for 3.3 V MII supply
Open
MDIO/MDC Access
J3
MDC_SEL
Allows selection between USB, MII or parallel port
MDC source
Jumper to
PMDC_MII
J4
MDIO_SEL
Allows selection between USB, MII or parallel port
MDIO source
Jumper to
PMDIO_MII
J22
GND
Ground for parallel port source
Open
Address
J24
PHYAD0
PHY address strap pin
Open
J26
PHYAD1
PHY address strap pin
Open
Auto-Negotiation
J33
ACT
Force/Advertised operation mode in auto-
negotiation
Pulled High
J36
SPEED
Force/Advertised operation mode in auto-
negotiation
Pulled High
J39
LINK
Enable/Disable auto-negotiation
Pulled High
Reset
J8
RESET_N
Allows reset of DP83620
Open
J40
/RESET
Allows reset of USB interface device
Open
Function
J5
PWRDOWN/INTN
Allows for powerdown and interrupt modes
Open
J23
MII_MODE
Allows for MII_MODE strap option. Placing the
jumper forces the unit into RMII mode.
Open
J25
LED_CFG
Allows for LED configuration strap option
Open
J29
RMII_MAS
Allows for RMII_MAS strap option. Placing the
jumper forces the unit into RMII Master mode when
MII_MODE (J23) is strapped.
Open
J32
CLK_OUT_EN
Allows for CLK_OUT_EN strap option
Open
J35
PCF_EN
Allows for PCF_EN strap option
Open
J38
Reserved
Reserved
Open
J41
Reserved
Reserved
Open
J42
Reserved
Reserved
Open
J64
ALP EEPROM write control (Internal Use)
Open
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DP83620 DEMO BOARD USER GUIDE
Interface
J1
LED/Strap header
Allows access to LED and strap pins
J2
CLK_OUT
Allows access to CLK_OUT signal
J6
JTAG
JTAG interface for DP83620
J7
USB
USB Mini B connector
J34
Reserved
Reserved
J46
Connector
RJ-45 connector
J53
FX Transceiver
HP FX transceiver (AFBR5803Z) - Not stuffed in
copper configuration
J56
MII Header
Allow connection to MII pins
J58
MII Male
Connector
Smartbits Interface
J60
ALP Connector
Internal Use – Not placed on Customer Demo
Boards
2.9 Modification for Fiber Operation
Provisions have been made to allow for the evaluation board to be configured for fiber mode
operation. To modify the board for fiber operation, the components on Sheet 7 of the schematic
should be placed, with R113, R114, R117, R118, and R128 all 0 ohm resistors. A 2.2k ohm
resistor should also be placed in R46 to strap the device into fiber mode. Resistors R112, R115,
R116, and R119 should be removed.
2.10 Register Access Software
Access to the device registers is available with the use of National’s Analog LaunchPAD
software. Refer to the DP83620 datasheet for detailed information on specific registers and to
the National Semiconductor website (www.national.com) for the most recent version of the
Analog LaunchPAD programming software.
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