Appendix B. System Address Maps
DMA I/O Address Map
The following figure lists resource assignments for the DMA address map. Any addresses that are not
shown are reserved.
Figure 46 (Page 3 of 3). I/O Address Map
Address (Hex)
Size
Description
7000–700D
14 bytes
SMBus I/O space registers
8000–8037
56 bytes
Power management I/O space registers
FF00–FF07
8 bytes
IDE bus master register
FFA0–FFA7
8 bytes
Primary bus master IDE registers
FFA8–FFAF
8 bytes
Secondary bus master IDE registers
Figure 47 (Page 1 of 2). DMA I/O Address Map
Address (Hex)
Description
Bits
Byte Pointer
0000
Channel 0, Memory Address register
00–15
Yes
0001
Channel 0, Transfer Count register
00–15
Yes
0002
Channel 1, Memory Address register
00–15
Yes
0003
Channel 1, Transfer Count register
00–15
Yes
0004
Channel 2, Memory Address register
00–15
Yes
0005
Channel 2, Transfer Count register
00–15
Yes
0006
Channel 3, Memory Address register
00–15
Yes
0007
Channel 3, Transfer Count register
00–15
Yes
0008
Channels 0–3, Read Status/Write Command register
00–07
0009
Channels 0–3, Write Request register
00–02
000A
Channels 0–3, Write Single Mask register bits
00–02
000B
Channels 0–3, Mode register (write)
00–07
000C
Channels 0–3, Clear byte pointer (write)
N/A
000D
Channels 0–3, Master clear (write)/temp (read)
00–07
000E
Channels 0–3, Clear Mask register (write)
00–03
000F
Channels 0–3, Write All Mask register bits
00–03
0081
Channel 2, Page Table Address register
1
00–07
0082
Channel 3, Page Table Address register
1
00–07
0083
Channel 1, Page Table Address register
1
00–07
0087
Channel 0, Page Table Address register
1
00–07
0089
Channel 6, Page Table Address register
1
00–07
008A
Channel 7, Page Table Address register
1
00–07
008B
Channel 5, Page Table Address register
1
00–07
008F
Channel 4, Page Table Address/Refresh register
00–07
00C0
Channel 4, Memory Address register
00–15
Yes
00C2
Channel 4, Transfer Count register
00–15
Yes
00C4
Channel 5, Memory Address register
00–15
Yes
00C6
Channel 5, Transfer Count register
00–15
Yes
00C8
Channel 6, Memory Address register
00–15
Yes
00CA
Channel 6, Transfer Count register
00–15
Yes
Appendix B. System Address Maps
43