![](http://datasheet.mmic.net.cn/390000/SYM53C876_datasheet_16836340/SYM53C876_80.png)
3-10
SYM53C876/876E Data Manual
Signal Descriptions
PCI Interface Pins
GPIO Interface Pins
Table 3-7: GPIO Interface Pins
Pin Name
Pin/Ball Number
Type
Strength
Description
A_GPIO0_
FETCH/
68, W7
I/O
16 mA
SCSI Function A General Purpose I/O pin 0.
Option-
ally, when driven low, indicates that the next bus request
is for an op code fetch. This pin is programmable at pow-
erup through the MAD(7-6) pins to serve as either the
data or clock signal for the serial EEPROM interface.
SCSI Function B General Purpose I/O pin 0.
Option-
ally, when driven low, indicates that the next bus request
is for an op code fetch. This pin is programmable at pow-
erup through the MAD(7-6) pins to serve as either the
data or clock signal for the serial EEPROM interface.
SCSI Function A General purpose I/O pin 1.
Option-
ally, when driven low, indicates that the SYM53C876 is
bus master. This pin is programmable at powerup
through the MAD(7-6) pins to serve as either the data or
clock signal for the serial EEPROM interface.
SCSI Function B General purpose I/O pin 1.
Option-
ally, when driven low, indicates that the SYM53C876 is
bus master. This pin is programmable at powerup
through the MAD(7-6) pins to serve as either the data or
clock signal for the serial EEPROM interface.
SCSI Function A General Purpose I/O pin 2.
This
pin is a general purpose I/O pin that powers up as an
input.
SCSI Function B General purpose I/O pin 2.
B
_
GPIO2 powers up as an input.
SCSI Function A General purpose I/O pin 3.
A_GPIO3 powers up as an input. Currently our drivers,
use A_GPIO3 as a means to detect Diffsense.
SCSI Function B General purpose I/O pin 3.
B_GPIO3 powers up as an input. Currently our drivers,
use B_GPIO3 as a means to detect Diffsense.
SCSI Function A General purpose I/O pin 4.
A_GPIO4 powers up as an output. It can be used as the
enable line for VPP, the 12 Volt power supply to the exter-
nal flash memory interface.
SCSI Function B General purpose I/O pin 4.
B_GPIO4 powers up as an output. It can be used as the
enable line for VPP, the 12 Volt power supply to the exter-
nal flash memory interface.
B_GPIO0_
FETCH/
84, U11
I/O
16 mA
A_GPIO1_
MASTER/
69, Y7
I/O
16 mA
B_GPIO1_
MASTER/
86, Y12
I/O
16 mA
A_GPIO2
70, V8
I/O
16 mA
B_GPIO2
87, W12
I/O
16 mA
A_GPIO3
71, W8
I/O
16 mA
B_GPIO3
88, V12
I/O
16 mA
A_GPIO4
73, Y8
I/O
16 mA
B_GPIO4
89, U12
I/O
16 mA