VT8231 datasheet(120/132 Pages) ETC

120 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-114-

Function 5 & 6 Registers - AC97 Audio & Modem Codecs

7HFKQRORJLHV ,QF

:H &RQQHFW

I/O Offset 50 – FM Channel SGD Status .....................RWC

SGD Active (0 = completed or terminated)........RO

6-3

Reserved

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

SGD Stopped ........................................................RO

SGD EOL

......................................................RWC

SGD Flag

......................................................RWC

I/O Offset 51 – FM Channel SGD Control......................RW

SGD Trigger ........................... WO (always reads 0)

No effect

Trigger SGD Operation

SGD Terminate ...................... WO (always reads 0)

No effect

Terminate SGD Operation

5-4

Reserved (Do Not Program)............always write 0’s

3SGD Pause

Release SGD pause and resume the transfer

from the paused line

Pause SGD read operation (SGD pointer stays

at the current address)

2-0

Reserved (No Function) ...................................... RW

I/O Offset 52 – FM Channel SGD Type ..........................RW

Auto Restart

Stop SGD Operation at EOL

Restart SGD Operation at EOL

6-4

Reserved

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

3-2

Interrupt Select

00 Interrupt at last line PCI read

01 Interrupt at last sample sent

10 Interrupt at less than one line to send

11 -reserved-

Interrupt on EOL @ End of Block

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

1Enable

Interrupt on FLAG @ End-of-Blk

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

1Enable

I/O Offset 57-54 – FM Channel SGD Table Pointer ......RW

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

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

I/O Offset 5F-5C – FM Channel SGD Current Count....RO

31-24 Current SGD Index

23-0 Current SGD Count

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