VT82C686B
Function 5 I/O Base 0 Registers – AC97 Audio S/G DMA
Offset AC97 SGD I/O Registers Default Acc
Function 6 I/O Base 0 Registers – MC97 Modem S/G DMA
Offset MC97 SGD I/O Registers
40 SGD Read Channel Status
41 SGD Read Channel Control
42 SGD Read Channel Type
43 -reserved-
Default Acc
0
1
2
3
SGD Read Channel Status
SGD Read Channel Control
SGD Read Channel Type
-reserved-
00
00
00
00
00
00
00
00
WC
RW
RW
—
WC
RW
RW
—
7-4 SGD Read Chan Table Pointer Base 0000 0000 WR
47-44 SGD Read Chan Table Pointer Base 0000 0000 WR
SGD Read Channel Current Address
B-8 Reserved (Test)
RD
RO
RO
WC
RW
RW
—
SGD Read Channel Current Address
4B-48 -reserved- (Test)
RD
RO
RO
WC
RW
RW
—
0000 0000
0000 0000
0000 0000
0000 0000
F-C SGD Read Chan Current Count
10 SGD Write Channel Status
11 SGD Write Channel Control
12 SGD Write Channel Type
13 -reserved-
4F-4C SGD Read Chan Current Count
50 SGD Write Channel Status
51 SGD Write Channel Control
52 SGD Write Channel Type
53 -reserved-
00
00
00
00
00
00
00
00
17-14 SGD Write Chan Table Pointer Base 0000 0000 WR
57-54 SGD Write Chan Table Pointer Base 0000 0000 WR
SGD Write Channel Current Address
1B-18 Reserved (Test)
1F-1C SGD Write Channel Current Count
20 SGD FM Channel Status
21 SGD FM Channel Control
22 SGD FM Type
RD
RO
RO
WC
RW
RW
—
SGD Write Channel Current Address
5B-58 Reserved (Test)
5F-5C SGD Write Channel Current Count
60-7F -reserved-
RD
RO
RO
—
0000 0000
0000 0000
0000 0000
0000 0000
00
00
00
00
00
Offset AC97 / Modem Codec I/O Registers Default Acc
83-80 AC97 Controller Command / Status
87-84 SGD Status Shadow
0000 0000 RW
23 -reserved-
0000 0000
RO
27-24 SGD FM Channel Table Pointer Base 0000 0000 WR
8B-88 Modem Codec GPI Intr Status / GPIO 0000 0000
8F-8C Modem Codec GPI Interrupt Enable 0000 0000 RW
90-FF -reserved- 00
WC
SGD FM Channel Current Address
2B-28 Reserved (Test)
RD
RO
RO
—
0000 0000
0000 0000
00
—
2F-2C SGD FM Channel Current Count
30-7F -reserved-
Offset AC97 / Audio Codec I/O Registers
83-80 AC97 Controller Command / Status
87-84 SGD Status Shadow
Default Acc
0000 0000 RW
0000 0000
00
RO
—
88-FF -reserved-
Function 5 I/O Base 1 Registers – FM NMI Status
Offset FM NMI Status Registers Default Acc
0
1
2
3
FM NMI Status
FM NMI Data
FM NMI Index
-reserved-
00
00
00
00
RO
RO
RO
—
Function 5 I/O Base 2 Registers – MIDI / Game Port
Offset FM NMI Status Registers
1-0 MIDI Port Base
3-2 Game Port Base
Default Acc
0330
0200
RW
RW
Revision 1.71 June 9, 2000
-37-
Register Overview
ETC [ ETC ]
