VT82C686B
Function 5 & 6 Codec-Specific Configuration Registers
Offset 40 – AC97 Interface Status ....................................RO
Offset 41 – AC Link Interface Control ........................... RW
........................................ always reads 0
Secondary Codec Ready Status ..........................RO
7-3 Reserved
7
6
5
4
3
AC-Link Interface Enable (ENAC97)
0
Disable................................................... default
2
1
0
0
Codec Not Ready
1
Enable
1
Codec Ready (AC97 ctrlr can access codec)
AC-Link Reset (ACRST#)
0
Assert AC-Link Reset............................ default
AC97 Codec Low-Power Status..........................RO
0
AC97 Codec not in low-power mode
1
De-assert AC-Link Reset
1
AC97 Codec in low-power mode
AC-Link Sync (RSYNCHI)
0
Release SYNC ....................................... default
AC97 Codec Ready Status...................................RO
0
Codec Not Ready
1
Force SYNC High
1
Codec Ready (AC97 ctrlr can access codec)
AC-Link Serial Data Out
0
Release SDO.......................................... default
1
Force SDO High
Variable-Sample-Rate On-Demand Mode
0
Disable................................................... default
1
Enable
Bit valid in function 5 only (reserved in function 6)
2
1
0
AC Link SGD Read Channel PCM Data Output
0
Disable................................................... default
1
Enable
Bit valid in function 5 only (reserved in function 6)
AC Link FM Channel PCM Data Out (SELFM)
0
Disable................................................... default
1
Enable
Bit valid in function 5 only (reserved in function 6)
AC Link SB PCM Data Output (SELSB)
0
Disable................................................... default
1
Enable
Bit valid in function 5 only (reserved in function 6)
Revision 1.71 June 9, 2000
-108- Function 5 & 6 Registers - AC97 Audio & Modem Codecs
ETC [ ETC ]
