Product specifications

VT8235 V-Link South Bridge
Revision 1.22 October 24, 2002 -101- 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[4] 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)
1-0 Reserved ........................................always reads 0