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