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IBR—Information Base Repair Register
Address
BB + 2BC0
Access
R/W
The IBR register is used to access the EEPROM located on the I/O
port. To access the EEPROM, software continually updates the
IBR register to transfer command, address, and data to and from
the device. Writing an alternating one and zero pattern to
IBR<SCLK> implements the serial data clock used for the
EEPROM protocol. Command, address, and write data is serially
transferred to the EEPROM by writing to IBR<XMT_SDAT> in ac-
cordance with the logic selected by <SCLK>. EEPROM read data
and response are read serially from IBR<RCV_SDAT> in accor-
dance with the logic selected by <SCLK>. When receiving
EEPROM read data and responses, <XMT_SDAT> must be one.
31
7-140 System Registers
RSVD
3
2
1
0
SCLK
XMT_SDAT
RCV_SDAT
BXB-0766-92
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