VT8235 datasheet(119/145 Pages) VIA

119 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-113-

Device 17 Function 6 Modem Controller Registers

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Modem-Specific PCI Configuration Registers

Offset 40 – AC Link Interface Status .............................. RO

7-6

Reserved

........................................ always reads 0

Codec CID=11b Ready Status............................ RO

Codec Not Ready

Codec Ready (modem ctrlr can access codec)

Codec CID=10b Ready Status............................ RO

Codec Not Ready

Codec Ready (modem ctrlr can access codec)

Reserved

........................................ always reads 0

Codec CID=01b Ready Status............................ RO

Codec Not Ready

Codec Ready (modem ctrlr can access codec)

AC97 Low-Power Status .................................... RO

AC97 Codecs not in low-power mode

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.

Codec CID=00b Ready Status............................ RO

Codec Not Ready

Codec Ready (modem ctrlr can access codec)

Offset 41 – AC Link Interface Control ........................... RW

AC-Link Interface

Disable ................................................... default

Enable

AC-Link Reset

0Assert AC-Link Reset (used for cold reset).......... def

1De-assert AC-Link Reset

AC-Link Sync

Release SYNC ....................................... default

Force SYNC High (used for warm reset)

AC-Link Serial Data Out

Release SDO.......................................... default

Force SDO High

Variable-Sample-Rate On-Demand Mode ........ RO

This bit is controlled through function 5 but may be

read from function 6.

Disable (AC Link sends data every frame).. def

Enable (AC Link sends data only when there is

a request from the codec)

3D Audio Channel Slots 3/4 ................................ RO

This bit is controlled through function 5 but may be

read from function 6.

Disable ................................................... default

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

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