ARM ARM DUI 0224I Computer Hardware User Manual


 
Memory Expansion Boards
E-6 Copyright © 2003-2007 ARM Limited. All rights reserved. ARM DUI 0224F
E.3 EEPROM contents
There are three serial devices on the PB926EJ-S serial bus:
Dynamic Memory Expansion EEPROM at
0xA0
for write,
0xA1
for read
Static Memory Expansion EEPROM at
0xA2
for write,
0xA3
for read
Real Time Clock (Time of Year) at
0xD0
for write,
0xD1
for read
See Serial bus interface on page 4-86 for details on the serial bus interface.
Both memory Expansion Proems are 256 bytes in size and have a similar structure:
Static Memory Expansion EEPROM contains 5 chip select information blocks, a
manufacturer string and a checksum.
Dynamic Memory Expansion EEPROM contains 3 chip select information
blocks, a manufacturer string and a checksum.
Each chip select information block contains details about the memory devices accessed
with the corresponding chip select signal. The organization of a chip select information
block is listed in table Table E-2 on page E-7.
Note
Table E-2 on page E-7 organization and the examples given are valid for all pre-v1.0
PISMO compliant memory expansion boards. For v1.0 onwards please check the latest
PISMO specification at www.pismoworld.org