BIOS SPECIFICATION
6-13

5. GPIO Pin Assignment

The following tables are the definition of GPIO pins. Some of GPIO pins need to be initialized by system BIOS
and some of them need the driver to support. Please check the Description column for reference.
Table 5-1. ICH7-M GPIO Definition
GPIO Type Name Usage Power Description
0 I GPIO00/BM_BUSY# BM_BUSY# M Native Function
1 I GPIO01/REQ5# REQ5# M Native Function
2 I GPIO02/PIRQE# PIRQE# M Native Function
3 I GPIO03/PIRQF# PIRQF# M Native Function
4 I GPIO04/PIRQG# PIRQG# M Native Function
5 I GPIO05/PIRQH# PIRQH# M Native Function
6 I/O GPIO06 N/A M
7 I GPIO07 RF_OFF_SW# M N/A
8 I GPIO08 EXTSMI#
R From KBC, it is to notify system an
external SMI occurred.
9 I GPIO09 SATA_DET#0 R SATA indicator
10 I/O GPIO10 N/A R
11 I GPIO11/SMBALERT# SMBALERT# R Native Function
12 I GPIO12 KBDSCI R From KBC, runtime and wake up event
will be sent to system through this pin.
13 I GPIO13 SIO_SMI# R Super I/O SMI event
14 I/O GPIO14 PWRLED_1Hz R 1Hz On/Off cycle for Power LED
15 I/O GPIO15 N/A R
16 O GPIO16/GNT6# GNT6# M Native Function
17 O GPIO17/GNT5# GNT5# M Native Function
18 O GPIO18/STP_PCI# STP_PCI# M This signal is an output to the external
clock generator fo r it to turn off the PCI
clock. Used to support PCI CLKRUN#
protocol.
19 I GPIO19/SATA1GP SATA1GP M N/A
20 O GPIO20/STP_CPU# STP_CPU# M Output to the external clock generator
for it to turn off the CPU clock. Used to
support the C3 state.
21 I GPIO21/SATA0GP SATA0GP M Native Function
22 I GPIO22/REQ4# REQ4# M Native Function
23 I/O GPIO23/LDRQ1# LDRQ1# M Native Function
24 O GPIO24 802_LED_EN# R Enable Wireless LED
25 O GPIO25 CB_SD# R Disable CardBus function.
26 I/O GPIO26 R
27 O GPIO27/EL_STATE0 BT_LED_EN# R Enable BlueTooth LED
28 I/O GPIO28/EL_STATE1 R
29 I GPIO29/OC#5 OC#5 R N/A
30 I GPIO30/OC#6 OC#6 R N/A
31 I GPIO31/OC#7 OC#7 R N/A
32 O GPIO32/CLKRUN# PM_CLKRUN# M Used to support PCI clock run protocol.
Connects to PCI devices that need to
request clock re-start, or prevention of
clock stopping.
33 O GPIO33/AZ_DOCK_EN# BT_ON M Turn On/Off BlueTooth
34 O GPIO34/AZ_DOCK_RST# WLAN_ON# Turn On/Off Wireless LAN
35 O GPIO35/SATACLKREQ# SATACLKREQ# M Native Function
36 I GPIO36/SATA2GP SATA2GP M Native Function
37 I GPIO37/SATA3GP SATA3GP M Native Function
38 I GPIO38 PCB_ID0 M 1st PCB ID pin
39 I GPIO39 PCB_ID1 M 2nd PCB ID pin
40 N/A GPIO40 N/A N/A N/A