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VT8231
Preliminary Revision 0.8
October 29, 1999
-38-
Register Overview
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PCI Function 5 & 6 Registers
–
AC97 / MC97 Codecs
Function 5 Configuration Space AC97 Header Registers
Offset PCI Configuration Space Header
1-0
Vendor ID
3-2
Device ID
5-4
Command
7-6
Status
8
Revision ID
9
Programming Interface
A
Sub Class Code
B
Base Class Code
C
Cache Line Size
D
Latency Timer
E
Header Type
F
BIST
13-10 Base Address 0 - SGD Control/Status
0000 0001 RW
17-14 Base Address 1 - FM NMI Status
1B-18 Base Address 2 - MIDI Port
1F-1C Base Address 3 (reserved)
23-20 Base Address 4 (reserved)
27-24 Base Address 5 (reserved)
28-29 -reserved-
2F-2C Subsystem ID / SubVendor ID
33-30 Expansion ROM (reserved)
34
Capture Pointer
35-3B -reserved-
3C
Interrupt Line
3D
Interrupt Pin
3E
Minimum Grant
3F
Maximum Latency
Default
1106
3058
0000
0210
40
00
01
04
00
00
00
00
Acc
RO
RO
RW
WC
RO
RO
RO
RO
RO
RW
RO
RO
0000 0001 RW
0000 0331 RW
0000 0000
—
0000 0000
—
0000 0000
—
00
0000 0000
RW
0000 0000
—
00
00
00
03
00
00
—
RW
—
RW
RO
RO
RO
Configuration Space Audio Codec-Specific Registers
Offset Audio Codec Link Control
40
AC-Link Interface Status
41
AC-Link Interface Control
42
Function Enable
43
Plug and Play Control
44
MC97 Interface Control
45-47 -reserved-
48
FM NMI Control
49
-reserved-
4B-4A Game Port Base Address
4C-FF -reserved-
Default
00
00
00
1C
00
00
00
00
0000
00
Acc
RO
RW
RW
RW
RO
—
RW
—
RW
—
Function 6 Configuration Space MC97 Header Registers
Offset PCI Configuration Space Header
1-0
Vendor ID
3-2
Device ID
5-4
Command
7-6
Status
8
Revision ID
9
Programming Interface
A
Sub Class Code
B
Base Class Code
C
Cache Line Size
D
Latency Timer
E
Header Type
F
BIST
13-10 Base Address 0 - SGD Control/Status
0000 0001 RW
17-14 Base Address 1 - (reserved)
1B-18 Base Address 2 - (reserved)
1F-1C Base Address 3
–
Codec Reg Shadow
0000 0001
—
23-20 Base Address 4 (reserved)
27-24 Base Address 5 (reserved)
28-29 -reserved-
2F-2C Subsystem ID / SubVendor ID
33-30 Expansion ROM (reserved)
34
Capture Pointer
35-3B -reserved-
3C
Interrupt Line
3D
Interrupt Pin
3E
Minimum Grant
3F
Maximum Latency
Default
1106
3068
0000
0200
40
00
80
07
00
00
00
00
Acc
RO
RO
RW
WC
RO
RO
RO
RO
RO
RW
RO
RO
0000 0000
RW
0000 0000
RW
0000 0000
—
0000 0000
—
00
0000 0000
RW
0000 0000
—
00
00
00
03
00
00
—
RW
—
RW
RO
RO
RO
Configuration Space Modem Codec-Specific Registers
Offset Modem Codec Link Control
40
AC-Link Interface Status
41
AC-Link Interface Control
42
Function Enable
43
Plug and Play Control
44
MC97 Interface Control
45-47 -reserved-
48
FM NMI Control
49
-reserved-
4B-4A Game Port Base Address
4C-FF -reserved-
Default
00
00
00
1C
00
00
00
00
0000
00
Acc
RO
RW
RO
RO
RW
—
RO
—
RO
—