LSI 53C875A - Manual (Page 86)

3-10 Signal Descriptions
3.5 GPIO Signals
Table 3.11 describes the SCSI GPIO signals.
Table 3.11 GPIO Signals
Name PQFP BGA Type Strength Description
GPIO0_FETCH/ 53 N5 I/O 8 mA SCSI General Purpose I/O pin. Optionally,
when driven LOW, indicates that the next bus
request will be for an opcode fetch. This pin is
programmable at power-up through the MAD7
pin to serve as the data signal for the serial
EEPROM interface. This signal can also be
programmed to be driven LOW when the
LSI53C875A is active on the SCSI bus.
GPIO1_MASTER/ 54 K6 I/O 8 mA SCSI General Purpose I/O pin. Optionally,
when driven LOW, indicates that the
LSI53C875A is bus master. This pin is
programmable at power-up through the MAD7
pin to serve as the clock signal for the serial
EEPROM interface.
GPIO2 68 J8 I/O 8 mA SCSI General Purpose I/O pin. This pin
powers up as an input.
GPIO3 70 M9 I/O 8 mA SCSI General Purpose I/O pin. This pin
powers up as an input.
GPIO4 71 L9 I/O 8 mA SCSI General Purpose I/O pin. GPIO4
powers up as an output. (This pin may be used
as the enable line for VPP, the 12 V power
supply to the external flash memory interface.)