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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
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
26
NC
27
NC
28
Password Enable
I
NOTE:
NC = not connected (not used).
Содержание Deskpro EXS
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