IBM CMX58886CX - Manual (Page 81)

BDM-610000050 Rev A Chapter 4: Using the cpuModule 73
User EEPROM
A 512kB serial EEPROM (Atmel AT93C66) is available on the cpuModule for the user to save nonvolatile
parameters on the cpuModule. The EEPROM can be accessed by reading and writting to I/O address 456h, as
shown in the following table.
Table 55 User EEPROM I/O Address 456h
D7 D6 D5 D4 D3 D2 D1 D0
CS SK DI DO Reserved (Multi-Color LED)
Table 56 EEPROM Register Description
Bit Signal Function Read / Write
D7 CS Chip Select Read / Write
D6 SK Serial Data Clock Read / Write
D5 DI Serial Data Input Read / Write
D4 DO Serial Data Output Read Only
D3 Reserved
D2 (Multi-Color LED)
D1 (Multi-Color LED)
D0 (Multi-Color LED)