82801 Ich General Purpose Functions - Compaq iPAQ 1.0 Technical Reference Manual

4.7.2 82801 ICH GENERAL PURPOSE FUNCTIONS

The 82801 ICH2 component includes a number of single and multi-purpose pins available as
general-purpose input/output (GPIO) ports. The GPIO ports are configured (enabled/disabled)
during POST by BIOS through the PCI configuration registers of the ICH's LPC I/F Bridge
(82801, function 0). The GPIO ports are controlled through 64 bytes of I/O space that is mapped
during POST.
Table 4-11 lists the utilization of the ICH's GPIO ports.
Table 4-11. 82801 ICH GPIO Register Utilization
82801 ICH2 GPIO Register Utilization
GPIO Port # Function
0 PS LED detect
1 NIC REQ5
2 IRQE-
3 IRQF-
4 IRQG-
5 IRQH-
6 HD LED detect
7 --
8 --
11 Multibay device detect
12 --
13 SMI from I/O
18 --
19 --
20 --
21 --
22 --
23 --
24 --
25 --
26 --
27 --
28 Password (1 = Enabled, 0 = Disabled)
NOTE:
NC = not connected (not used).
Table 4-11.
Compaq iPAQ Series of Desktop Personal Computers
Second Edition - February 2001
Technical Reference Guide
Direction
I
I
I
I
I
I
I
NC
NC
I
NC
I
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
I
4-27