Serial Eeprom; Interrupts - Rastergraf Topaz User Manual

5.13 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 secondary I2C control lines on the
SM731.
Rastergraf reserves the first 128 bytes of the 256 byte Serial EEPROM for
internal use. The remaining 128 bytes are left for user data. The use of the
serial EEPROM on the graphics board does not currently have formal
Rastergraf software support.

5.14 Interrupts

There is not a lot to say about interrupts for the graphics board. The
SM731 chip is connected to the INTA line. The interrupt is controlled
through the control registers in the chip itself. See Section 2.3.2 for more
comments about Interrupts. Note that if the LM75 Temperature Sensor is
installed, it too can cause an interrupt on the INTA line.
What happens on that line at the other end (CPU side) is beyond the scope
of this manual. In most cases, the interrupts are combined with other PCI
slots, and the software will have to poll all PCI devices to see who made
the interrupt.
2
C Serial Electrically Erasable
Programming On-board Devices and Memories 5-31
Rastergraf