82801 Ich General Purpose Functions; Table - HP Deskpro EX Technical Reference Manual

4.9.2 82801 ICH GENERAL PURPOSE FUNCTIONS

The 82801 ICH 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 4-18 lists the utilization of the ICH's GPIO ports in these systems.
Table 4-18 lists the GPIO registers for the LPC47B357.
Table 4-18. 82801 ICH GPIO Register Utilization
82801 ICH GPIO Register Utilization
GPIO Port # Function
0 --
1 --
2 --
3 --
4 --
5 --
6 --
7 PCI PERR#
8 Password Enable
12 --
13 SIO SMI
18 --
19 --
20 --
21 --
22 --
23 --
24 S3 Power Control
25 --
26 SIO 32-KHz Clock
27 SMBus Clock
28 SMBus Data
NOTE:
NC = not connected (not used).

Table 4-18.

Compaq Deskpro EX Series of Personal Computers
First Edition - August 2000
Technical Reference Guide
Direction
NC
NC
NC
NC
NC
NC
NC
I
I
NC
I
NC
NC
NC
NC
NC
NC
O
NC
O
I/O
I/O
4-39