VT8235 datasheet(108/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-102-

Device 17 Function 5 Audio Controller Registers

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Offset 42 – Function Enable .............................................RW

7-6

Reserved

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

Function 5 Config Reg Rx2C Writable .............RW

Device 17 Function 5 Rx2C-2F RO ...... default

Device 17 Function 5 Rx2C-2F RW

4-0

Reserved

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

Offset 44 – MC97 Interface Control ................................ RO

Mapped RO to function 5 (RW in func 6) for status reporting.

AC-Link Interface for Slot-5 (Modem) ............. RO

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

Enable

Secondary Codec Support .................................. RO

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

Enable

Function 6 Config Reg Rx9-B Writable ............ RO

Device 17 Function 6 Rx9-B RO .......... default

Device 17 Function 6 Rx9-B RW

Function 6 Config Reg 2Ch Writable................ RO

Device 17 Function 6 Rx2C-2F RO ...... default

Device 17 Function 6 Rx2C-2F RW

Sync

......................................................... RO

This bit reports whether there is activity in function 6

(modem). When function 5 (audio) enters low-power

state and wants to gate bit-clock, software needs to

check this bit to see whether bit-clock can actually be

gated, as function 6 shares the same bit-clock.

Function 6 activity in progress that requires

bit-clock

Function 6 does not need bit-clock so bit-clock

can be gated

2-0

Reserved

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

Offset 48 – Volume Change Rate Control ...................... RW

7-4

Volume Change Rate

This field controls the volume change rate in the

sample rate converter

0000 Volume Adjust Every Frame (sync cycle)... def

…

1111 Volume Adjust Every 16 Frames (sync cycles)

Sync

This bit reports whether there is activity in function 5

(audio). When function 6 (modem) enters low-power

state and wants to gate bit-clock, software needs to

check this bit to see whether bit-clock can actually be

gated, as function 5 shares the same bit-clock.

Function 5 activity in progress that requires

bit-clock

Function 5 does not need bit-clock so bit-clock

can be gated

2-0

Reserved

........................................................ RW

Offset 49 – S/PDIF Control .............................................. RW

7-4

Reserved

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

DX3 (DirectSound) Channel S/PDIF Support

This bit controls whether DirectSound Channel 3 is

used as S/PDIF support

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

Enable

Reserved

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

1-0

S/PDIF Data Slot Select

00 Slot 10/11............................................... default

01 Slot 3/4

10 Slot 7/8

11 Slot 6/9

Offset C3-C0 – Power Mgmt Capability.......................... RO

31-0 Power Mgmt Capability

....always reads 0002 0001h

Offset C7-C4 – Power State ............................................. RW

31-2 Reserved

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

1-0

Power State (D3 / D0 Only)

VT8235 Datasheet(PDF) 108 Page - VIA Technologies, Inc.

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