VT8231 datasheet(116/132 Pages) ETC

116 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-110-

Function 5 & 6 Registers - AC97 Audio & Modem Codecs

7HFKQRORJLHV ,QF

:H &RQQHFW

Function 5 & 6 Codec-Specific Configuration Registers

Offset 40 – AC97 Interface Status ....................................RO

7-5

Reserved

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

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

AC97 Codec not in low-power mode

AC97 Codec in low-power mode

Reserved

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

Secondary Codec 2 (CID=10b) Ready Status ....RO

Codec Not Ready

Codec Ready (AC97 ctrlr can access codec)

Secondary Codec 1 (CID=01b) Ready Status ....RO

Codec Not Ready

Codec Ready (AC97 ctrlr can access codec)

Primary Codec Ready Status ..............................RO

Codec Not Ready

Codec Ready (AC97 ctrlr can access codec)

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

AC-Link Interface Enable (ENAC97)

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

1Enable

AC-Link Reset (ACRST#)

Assert AC-Link Reset ............................ default

De-assert AC-Link Reset

AC-Link Sync (RSYNCHI)

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

Force SYNC High

AC-Link Serial Data Out

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

Force SDO High

Function 5 Only (Reserved in Function 6):

Variable-Sample-Rate On-Demand Mode

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

1Enable

Bit valid in function 5 only (reserved in function 6)

AC Link SGD Read Channel PCM Data Output

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

1Enable

Bit valid in function 5 only (reserved in function 6)

AC Link FM Channel PCM Data Out (SELFM)

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

1Enable

Bit valid in function 5 only (reserved in function 6)

AC Link SB PCM Data Output (SELSB)

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

1Enable

Bit valid in function 5 only (reserved in function 6)

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