Specifications

7-140 System Registers

IBR—Information Base Repair Register

ddress

ccess

BB + 2BC0

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.

BXB-0766-92

RSVD

SCLK

XMT_SDAT

RCV_SDAT

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