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Chapter 4 System Support
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
4-36
4.8.2 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 4-15 lists the utilization of the ICH’s GPIO ports in the desktop and minitower systems.
Table 4-15. 82801 ICH GPIO Register Utilization (Desktop and Minitower only)
Table 4-15.
82801 ICH2 GPIO Register Utilization
GPIO Port # Function Direction
0PS LED I
1NIC REQ5 I
2IRQE- I
3IRQF- I
4 IRQG- I
5 IRQH- I
6HD LED I
7-- NC
8NC
12 TAFI ASIC Interrupt I
13 SMI I
18 -- NC
19 -- NC
20 -- NC
21 -- NC
22 -- NC
23 -- NC
24 NC
25 -- NC
26 NC
27 NC
28 Password Enable I
NOTE:
NC = not connected (not used).