82801CA Datasheet, PDF (50/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

Signal Description
2.18 General Purpose I/O
Table 2-18. General Purpose I/O Signals
Name
GPIO[47:44]
GPIO[43:38]
GPIO[37:32]
GPIO[31:29]
GPIO[28:27]
GPIO[26]
GPIO[25]
GPIO[24]
GPIO[23]
GPIO[22]
GPIO[21]
GPIO[20]
GPIO[19]
GPIO[18]
GPIO[17:16]
GPIO[15:14]
GPIO[13:12]
GPIO[11]
GPIO[10:9]
GPIO[8]
GPIO[7]
GPIO[6]
GPIO[5:2]
GPIO[1:0]
Type
I/O
I/O
I/O
O
I/O
I/O
I/O
I/O
O
OD
O
O
O
O
O
I
I
I
I
I
I
I
I
I
Description
Not implemented.
Can be input or output. Main power well.
Can be input or output. Main power well.
Not implemented.
Can be input or output. Resume power well. Unmuxed.
Not implemented.
Can be input or output. Resume power well. Unmuxed.
Can be input or output. Resume power well.
Fixed as output only. Main power well.
Fixed as output only. Main power well.
Fixed as output only. Main power well. .
Fixed as output only. Main power well.
Fixed as output only. Main power well.
Fixed as output only. Main power well.
Fixed as Output only. Main Power Well. Can be used instead as PC/PCI
GNT[B:A]#. GPIO[17] can also alternatively be used for PCI GNT[5]#. Integrated
pull-up resistor.
Not implemented.
Fixed as Input only. Resume Power Well. Unmuxed.
Fixed as Input only. Resume Power Well. Can be used instead as SMBALERT#.
Not implemented.
Fixed as Input only. Resume Power Well. Unmuxed.
Fixed as Input only. Main power well. Unmuxed.
Fixed as Input only. Main power well.
Fixed as Input only. Main power well. Can be used instead as PIRQ[H:E]#.
Fixed as Input only. Main Power Well. Can be used instead as PC/PCI REQ[B:A]#.
GPIO[1] can also alternatively be used for PCI REQ[5]#.
NOTE: Only GPIO[7:0] are 5 V tolerant.
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Intel^® 82801CA ICH3-S Datasheet