Serial Eeprom; Serial Eeprom Data Format - Rastergraf VFX-M User Manual

Rastergraf

4.8 Serial EEPROM

The graphics board includes an IC position for an Atmel AT24C02 (or
equivalent) 2 Kb (256 bytes) I
Programmable Read Only Memory (EEPROM). The programming of the
Serial EEPROM is done through control lines on the I128S2.
I128S2
Signal Name
DC_CLK
DC_DAT
The EEPROM is programmed using the standard Philips I
system. The protocol for programming the EEPROM is delineated in the
2
I C Bus Specification: see Philips web site:
eu.semiconductors.philips.com/acrobat/various/I2C_BUS_SPECIFICATI
ON_2.pdf.
In general, the method for accessing the EEPROM is to use DC_CLK to
clock commands and data into or out of the EEPROM, with data passed to
the EEPROM over DC_DAT.

Serial EEPROM Data Format

Rastergraf reserves the first 128 bytes of the 256 byte Serial EEPROM for
internal use. This includes the VFX-M board serial number, revision, and
configuration data. The remaining 128 bytes are left for user data. The
following table lists the byte assignments in the EEPROM.
4-24 Troubleshooting
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2
C Serial Electrically Erasable
EEPROM
Mnemonic Description
SCL Serial EEPROM clock
SDA Serial EEPROM data input/output
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2
C two wire