82801 Ich2 General Purpose Functions - Compaq Evo D500 Technical Reference Manual

4.8.2 82801 ICH2 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 ICH2'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 ICH2's GPIO ports in these systems.
Table 4-18 lists the GPIO registers for the LPC47B357.
Table 4-18. 82801 ICH2 GPIO Register Utilization
82801 ICH2 GPIO Register Utilization
GPIO Port # Function
0 PS LED
1 NIC REQ5
2 IRQE-
3 IRQF-
4 IRQG-
5 IRQH-
6 HD LED
7 --
8 --
12 TAFI ASIC Interrupt
13 SMI
18 --
19 --
20 --
21 --
22 --
23 --
24 --
25 --
27 --
28 Password enable
NOTE:
NC = not connected
Table 4-18.
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition - March 2002
Technical Reference Guide
Direction
I
I
I
I
I
I
I
NC
NC
I
I
NC
NC
NC
NC
NC
NC
NC
NC
NC
I
4-39