Intel D845EPI User Manual

Intel Desktop Board D845EPI Technical Product Specification
38
2.3 Fixed I/O Map
Table 12. I/O Map
Address (hex) Size Description
0000 - 00FF 256 bytes Used by the Desktop Board D845EPI. Refer to the ICH4
data sheet for dynamic addressing information.
0170 - 0177 8 bytes Secondary IDE channel
01F0 - 01F7 8 bytes Primary IDE channel
0228 - 022F
(Note 1)
8 bytes LPT3
0278 - 027F
(Note 1)
8 bytes LPT2
02E8 - 02EF
(Note 1)
8 bytes COM4
02F8 - 02FF
(Note 1)
8 bytes COM2
0376 1 byte Secondary IDE channel command port
0377, bits 6:0 7 bits Secondary IDE channel status port
0378 - 037F 8 bytes LPT1
03B0 - 03BB 12 bytes Intel 82845E MCH
03C0 - 03DF 32 bytes Intel 82845E MCH
03E8 - 03EF 8 bytes COM3
03F0 - 03F5 6 bytes Diskette channel 1
03F6 1 byte Primary IDE channel command port
03F8 - 03FF 8 bytes COM1
04D0 - 04D1 2 bytes Edge/level triggered PIC
LPTn + 400 8 bytes ECP port, LPTn base address + 400h
0CF8 - 0CFB
(Note 2)
4 bytes PCI configuration address register
0CF9
(Note 3)
1 byte Turbo and reset control register
0CFC - 0CFF 4 bytes PCI configuration data register
FFA0 - FFA7 8 bytes Primary bus master IDE registers
FFA8 - FFAF 8 bytes Secondary bus master IDE registers
Notes:
1. Default, but can be changed to another address range
2. Dword access only
3. Byte access only
✏ NOTE
Some additional I/O addresses are not available due to ICH4 address aliasing. The ICH4 data
sheet provides more information on address aliasing.
For information about Refer to
Obtaining the ICH4 data sheet Section 1.3 on page 16

Intel D845EPI Specifications

General

Brand	Intel
Model	D845EPI
Category	Motherboard
Language	English