VT8231 datasheet(118/132 Pages) ETC

118 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-112-

Function 5 & 6 Registers - AC97 Audio & Modem Codecs

7HFKQRORJLHV ,QF

:H &RQQHFW

Function 5 I/O Base 0 Regs – DXSn Scatter/Gather DMA

“n” is 0-3 for DXS channels 0-3

I/O Offset n0 – DXSn SGD Read Channel 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 n1 – DXSn SGD Read Channel Control........RW

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

No effect

Trigger SGD Operation

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

No effect

Terminate SGD Operation

Auto Restart

Stop SGD Operation at EOL

Restart SGD Operation at EOL

4SGD 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

Interrupt on EOL @ End of Block

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

1Enable

Interrupt on FLAG @ End-of-Blk

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

1Enable

I/O Offset n2 – DXSn Read Channel Left Volume .........RW

7-6

Reserved

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

5-0

Left Volume Control

000000

0 db ...................................................default

000111

-10.5 db

011111

-46.5 db .............................................default

111111

muted (instead of –94.5 db)

I/O Offset n3 – DXSn Read Channel Right Volume ......RW

7-6

Reserved

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

5-0

Right Volume Control

000000

0 db ...................................................default

000111

-10.5 db

011111

-46.5 db .............................................default

111111

muted (instead of –94.5 db)

I/O Offset n7-n4 – DXSn SGD Table Pointer Base........ RW

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

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

I/O Offset nB-n8 – DXSn Read Channel Format............ RO

31-24 Stop Index (SGD operation will stop at end of entry)

23-22 Reserved

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

21-20 PCM Format

00 8-Bit Mono Format ................................ default

01 8-Bit Stereo Format

10 16-bit Mono Format............................... default

11 16-bit Stereo Format

19-0 DXSx Channel Sample Rate

I/O Offset nF-nC – DXSn SGD Count Pointer................ RO

31-24 Current SGD Index

23-0 Current SGD Count

SGD Table Format

60-56

55-32

31-0

EOL FLAG STOP

-reserved-

Base

(FM

Count

Address

Chan

[23:0]

[31:0]

Only)

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.

STOP

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

block. To resume the transfer, write 1 to Rx?0[2].

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