MCM63P736•MCM63P818
8MOTOROLA FAST SRAM
MCM63P818 PBGA PIN DESCRIPTIONS
Pin Locations Symbol Type Description
4B ADSC Input Synchronous Address Status Controller: Active low, interrupts any
ongoing burst and latches a new external address. Used to initiate a
READ, WRITE, or chip deselect.
4A ADSP Input Synchronous Address Status Processor: Active low, interrupts any
ongoing burst and latches a new external address. Used to initiate a
new READ, WRITE, or chip deselect (exception — chip deselect does
not occur when ADSP is asserted and SE1 is high).
4G ADV Input Synchronous Address Advance: Increments address count in
accordance with counter type selected (linear/interleaved).
(a) 6D, 7E, 6F, 7G, 6H, 7K, 6L, 6N, 7P
(b) 1D, 2E, 2G, 1H, 2K, 1L, 2M, 1N, 2P DQx I/O Synchronous Data I/O: “x” refers to the byte being read or written
(byte a, b).
4F G Input Asynchronous Output Enable Input:
Low — enables output buffers (DQx pins).
High — DQx pins are high impedance.
4K K Input Clock: This signal registers the address, data in, and all control signals
except G, LBO, and ZZ.
3R LBO Input Linear Burst Order Input: This pin must remain in steady state (this
signal not registered or latched). It must be tied high or low.
Low — linear burst counter (68K/PowerPC).
High — interleaved burst counter (486/i960/Pentium).
2A, 3A, 5A, 6A, 3B, 5B, 2C, 3C,
5C, 6C, 2R, 6R, 2T, 3T, 5T, 6T SA Input Synchronous Address Inputs: These inputs are registered and must
meet setup and hold times.
4N, 4P SA1, SA0 Input Synchronous Address Inputs: These pins must be wired to the two
LSBs of the address bus for proper burst operation. These inputs are
registered and must meet setup and hold times.
5L, 3G
(a) (b) SBx Input Synchronous Byte Write Inputs: “x” refers to the byte being written (byte
a, b). SGW overrides SBx.
4E SE1 Input Synchronous Chip Enable: Active low to enable chip.
Negated high — blocks ADSP or deselects chip when ADSC is
asserted.
2B SE2 Input Synchronous Chip Enable: Active high for depth expansion.
6B SE3 Input Synchronous Chip Enable: Active low for depth expansion.
4H SGW Input Synchronous Global Write: This signal writes all bytes regardless of the
status of the SBx and SW signals. If only byte write signals SBx are
being used, tie this pin high.
4M SW Input Synchronous Write: This signal writes only those bytes that have been
selected using the byte write SBx pins. If only byte write signals SBx
are being used, tie this pin low.
7T ZZ Input Sleep Mode: This active high asynchronous signal places the RAM into
the lowest power mode. The ZZ pin disables the RAMs internal clock
when placed in this mode. When ZZ is negated, the RAM remains in
low power mode until it is commanded to READ or WRITE. Data
integrity is maintained upon returning to normal operation.
4C, 2J, 4J, 6J, 4R VDD Supply Core Power Supply.
1A, 7A, 1F, 7F, 1J, 7J, 1M, 7M, 1U, 7U VDDQ Supply I/O Power Supply.
3D, 5D, 3E, 5E, 3F, 5F, 5G, 3H, 5H,
3K, 5K, 3L, 3M, 5M, 3N, 5N, 3P, 5P VSS Supply Ground.
1B, 7B, 1C, 7C, 2D, 4D, 7D, 1E, 6E,
2F, 1G, 6G, 2H, 7H, 3J, 5J, 1K, 6K,
2L, 4L, 7L, 6M, 2N, 7N, 1P, 6P, 1R,
5R, 7R, 1T, 4T, 2U, 3U, 4U, 5U, 6U
NC — No Connection: There is no connection to the chip.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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