VT8235 datasheet(110/145 Pages) VIA

110 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-104-

Device 17 Function 5 Audio Controller Registers

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I/O Offset x2 – DXS Left Channel x Volume (3Fh)........RW

I/O Offset x3 – DXS Right Channel x Volume (3Fh) .....RW

7-6

Reserved (Do Not Program)

............always write 0’s

5-0

Volume Control

000000 0 db

…

000111 -10.5 db

…

011111 -46.5 db

…

111111 Muted (instead of -94.5 db) .............. default

I/O Offset x7-x4 – DXS Chan x SGD Table Ptr Base.....RW

31-0 SGD Table Pointer Base Address (even addr).... W

Current Pointer Address ........................................R

I/O Offset xB-x8 – StopIndex / DataType / SampleRate RW

31-24 SGD Stop Index Setting

....................... default = FFh

23-22 Reserved

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

21-20 PCM Format

Selects the format used by the controller to process

the incoming sample.

00 8-bit Mono............................................. default

01 8-bit Stereo

10 16-bit Mono

11 16-bit Stereo

19-0 Sample Rate

.........................default = FFFFFh (48K)

This field allows the sample rate converter to know

the sample rate of an incoming sample so the

converter can properly convert the sample into the

required 48 KHz sample output. Program as (2

20 /

48.000) * Sample Rate

I/O Offset xF-xC – DXS Chan x SGD Current Count.... RO

31-24 Current SGD Index

This field reports the index the SGD engine is

currently processing.

23-0 Current SGD Count

This field reports the count remaining in the current

entry being processed. For example, if 10 bytes of a

30-byte count have been transferred, this field would

read 20 to indicate 20 bytes remaining.

Audio SGD Table Format

61-56

55-32

31-0

EOL FLAG -reserved-

Base

Count

Address

[23:0]

[31:0]

EOL

End Of Link. 1 indicates this block is the last of the

link.

If the channel “Interrupt on EOL” bit is set,

then an interrupt is generated at the end of the

transfer.

FLAG

Block Flag. If set, transfer pauses at the end of this

block. If the channel “Interrupt on FLAG” bit is set,

then an interrupt is generated at the end of this block.

VT8235 Datasheet(PDF) 110 Page - VIA Technologies, Inc.

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