Intel Desktop Board D865PCD Technical Product Specification
2.3 DMA Channels
Table 11. DMA Channels
DMA Channel Number
0
1
2
3
4
5
6
7
Data Width
8 or 16 bits
8 or 16 bits
8 or 16 bits
8 or 16 bits
8 or 16 bits
16bits
16bits
16bits
System Resource
Open
Parallel port
Diskette drive
Parallel port (for ECP or EPP)
DMA controller
Open
Open
Open
2.4 Fixed I/O Map
Table 12. I/O Map
Address (hex)
0000 - 00FF
0170 - 0177
01F0 - 01F7
0228 - 022F (Note 1)
0278 - 027F (Note 1)
02E8 - 02EF (Note 1)
02F8 - 02FF (Note 1)
0374 - 0377
0377, bits 6:0
0378 - 037F
03B0 - 03BB
03C0 - 03DF
03E8 - 03EF
03F0 - 03F5
03F4 – 03F7
03F8 - 03FF
04D0 - 04D1
LPTn + 400
0CF8 - 0CFB (Note 2)
0CF9 (Note 3)
0CFC - 0CFF
FFA0 - FFA7
FFA8 - FFAF
Notes:
Size
256 bytes
8bytes
8bytes
8bytes
8bytes
8bytes
8bytes
4bytes
7bits
8bytes
12bytes
32bytes
8bytes
6bytes
1byte
8bytes
2bytes
8bytes
4bytes
1byte
4bytes
8bytes
8bytes
Description
Used by the Desktop Board D865PCD. Refer to the ICH5 data sheet for dynamic addressing information.
Secondary Parallel ATA IDE channel command block
Primary Parallel ATA IDE channel command block
LPT3
LPT2
COM4
COM2
Secondary Parallel ATA IDE channel control block
Secondary IDE channel status port
LPT1
Intel 82865P MCH
Intel 82865P MCH
COM3
Diskette channel
Primary Parallel ATA IDE channel control block
COM1
Edge/level triggered PIC
ECP port, LPTn base address + 400h
PCI configuration address register
Reset control register
PCI configuration data register
Primary Parallel ATA IDE bus master registers
Secondary Parallel ATA IDE bus master registers
1.Default, but can be changed to another address range
2.Dword access only
3.Byte access only
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