Product specifications

VT8237R Data Sheet
Revision 2.06 December 15, 2004 -133- Device 17 Function 5 Audio Controller Registers
Audio-Specific PCI Configuration Registers
Offset 40 – AC Link Interface Status ...............................RO
7-6 Reserved ........................................ always reads 0
5 Codec CID=11b Ready Status ............................RO
0 Codec Not Ready
1 Codec Ready (audio ctrlr can access codec)
4 Codec CID=10b Ready Status ............................RO
0 Codec Not Ready
1 Codec Ready (audio ctrlr can access codec)
3 Reserved ........................................ always reads 0
2 Codec CID=01b Ready Status ............................RO
0 Codec Not Ready
1 Codec Ready (audio ctrlr can access codec)
1 AC97 Low-Power Status .....................................RO
0 AC97 Codecs not in low-power mode
1 AC97 Codecs in low-power mode
This bit reports 1 when Rx26[12] of the codecs
is 1. It is used to determine whether the bit-
clock should be gated.
0 Codec CID=00b Ready Status ............................RO
0 Codec Not Ready
1 Codec Ready (audio ctrlr can access codec)
Offset 41 – AC Link Interface Control........................... RW
7 AC-Link Interface
0 Disable................................................... default
1 Enable
6 AC-Link Reset
0Assert AC-Link Reset (used for cold reset) ......... def
1De-assert AC-Link Reset
5 AC-Link Sync
0 Release SYNC....................................... default
1 Force SYNC High (used for warm reset)
4 AC-Link Serial Data Out
0 Release SDO.......................................... default
1 Force SDO High
3 Variable-Sample-Rate On-Demand Mode
0 Disable (AC Link sends data every frame).. def
1 Enable (AC Link sends data only when there is
a request from the codec)
2 3D Audio Channel Slots 3/4
0 Disable................................................... default
1 Enable
Note that slots 7/8 and 6/9 do not have to be selected
as they are not muxed with DXS as are slots 3/4)
1 Free Running Clock
0 Dynamic Stop Clock.............................. default
1 Free Running Clock
0 Reserved ........................................always reads 0