Compaq iPAQ 1.0 - 82801 Ich General Purpose Functions

Technical Reference Guide
Compaq iPAQ Series of Desktop Personal Computers
Second Edition - February 2001
4-27
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
Table 4-11.
82801 ICH2 GPIO Register Utilization
GPIO Port # Function Direction
0 PS LED detect I
1NIC REQ5 I
2IRQE- I
3IRQF- I
4 IRQG- I
5 IRQH- I
6 HD LED detect I
7-- NC
8-- NC
11 Multibay device detect I
12 -- NC
13 SMI from I/O I
18 -- NC
19 -- NC
20 -- NC
21 -- NC
22 -- NC
23 -- NC
24 -- NC
25 -- NC
26 -- NC
27 -- NC
28 Password (1 = Enabled, 0 = Disabled) I
NOTE:
NC = not connected (not used).