VT8231 datasheet(124/132 Pages) ETC

124 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-118-

Function 5 & 6 Registers - AC97 Audio & Modem Codecs

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Function 6 I/O Base 0 Regs –Modem Scatter/Gather DMA

I/O Offset 0 – Modem Read Channel SGD Status.......RWC

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

SGD Paused ..........................................................RO

5-4

Reserved

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

SGD Trigger Queued (transaction will restart after

EOL)

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

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

SGD EOL

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

SGD Flag

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

I/O Offset 1 – Modem Read 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 2 – Modem Read 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 7-4 – Modem SGD Read Table Pointer .........RW

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

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

I/O Offset F-C – Modem SGD Current Read Count.......RO

31-24 Reserved

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

23-0 Current SGD Read Count

I/O Offset 10 – Modem Write Channel SGD Status ... RWC

7SGD Active (0 = completed or terminated) .......... RO

SGD Paused ......................................................... RO

5-4

Reserved

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

SGD Trigger Queued (transaction will restart after

EOL)

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

Reserved

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

1SGD EOL (clear interrupt if Rx62[1] is set)..... RWC

0SGD Flag (clear interrupt if Rx62[0] is set) ..... RWC

I/O Offset 11 – Modem Write 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

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

3SGD Pause

Release SGD pause and resume the transfer

from the paused line

Pause SGD read operation (SGD pointer stays

at the current address)

3-2

Reserved

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

I/O Offset 12 – Modem Write Channel SGD Format .... RW

Auto Restart

Stop SGD Operation at EOL

Restart SGD Operation at EOL

6-2

Reserved

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

Interrupt on EOL @ End of Block

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

1Enable

Interrupt on FLAG @ End-of-Blk

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

1Enable

I/O Offset 17-14 – Modem Wr Chan SGD Table Ptr .... RW

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

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

I/O Offset 1F-1C – Modem Wr Chan SGD Current CntRO

31-24 Current SGD Index

23-0 Current SGD Count

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