LSI LSI53C896, Technical Manual

Page: 100 / 370

3-12 Signal Descriptions
3.2.8 SCSI Function B GPIO Signals
Table 3.9 describes the signals for the SCSI Function B GPIO group.
Table 3.9 SCSI Function B GPIO Signals
Name Bump Type Strength Description
B_GPIO0_
FETCH/ AA14 I/O 8 mA SCSI Function B General Purpose I/O pin 0. This pin
is programmable at power-up through the MAD[7] pin
to serve as the data signal for the serial EEPROM
interface. When GPIO_0 is not in the process of
downloading EEPROM data it can be used to drive a
SCSI Activity LED if bit 5 in the
General Purpose Pin
Control (GPCNTL) register is set. Or, it can be used to
indicate that the next bus request will be an opcode
fetch if bit 6 in the GPCNTL register is set.
B_GPIO1_
MASTER/ AC15 I/O 8 mA SCSI Function B General Purpose I/O pin 1. This pin
is programmable at power-up through the MAD[7] pin
to serve as the clock signal for the serial EEPROM
interface. When
General Purpose Pin Control
(GPCNTL) bit 7 is set, this pin is driven LOW when the
LSI53C896 is bus master.
B_GPIO2 AB15 I/O 8 mA SCSI Function B General Purpose I/O pin 2. This pin
powers up as an input.
B_GPIO3 AA15 I/O 8 mA SCSI Function B General Purpose I/O pin 3. This pin
powers up as an input.
B_GPIO4 AC16 I/O 8 mA SCSI Function B General Purpose I/O pin 4. This pin
powers up as an output.
*