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7.4 Direct Memory Access (DMA) Channels
Table 40 DMA Channels
DMA# Data Width Available Description
0 8 bits Yes Note 3
1 8 bits Yes Note 3
2 8 bits Note 1, 3 Floppy Drive Controller
3 8 bits Note 2, 3 Parallel Port (LPT)
4 16 bits No Cascade DMA Controller
5 16 bits Yes
6 16 bits Yes
7 16 bits Yes
Notes
1. If the corresponding device is disabled in BIOS setup then the DMA channel can be
used by customers hardware.
2. Not available if Parallel Port is used in ECP mode (Enhanced Parallel Port).
3. Only the 8 bit DMA channels 0-3 can be mapped to the LPC bus.
7.5 PCI Configuration Space Map
Table 41 PCI Configuration Space Map
Bus Number
(hex) Device Number
(hex) Function Number
(hex) PCI Interrupt
Routing Description
00h 01h 00h Internal Host Bridge
00h 01h 01h Internal VGA Graphics
00h 01h 02h Internal Encryption
00h 0Eh 00h INTC VT6421 RAID Controller
00h 0Fh 00h Internal ISA Bridge
00h 0Fh 02h Internal IDE Controller
00h 0Fh 03h Internal Audio Multimedia Device
00h 0Fh 04h Internal OHCI Host Controller 0
00h 0Fh 05h Internal OHCI Host Controller 1
00h 0F 06h Internal UDC Controller
00h 0F 07h Internal ODC Controller
00h 10h 00h INTD RTL8100C Ethernet Controller
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