VT8231 datasheet(119/132 Pages) ETC

119 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-113-

Function 5 & 6 Registers - AC97 Audio & Modem Codecs

7HFKQRORJLHV ,QF

:H &RQQHFW

I/O Offset 40 – 3D 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 41 – 3D 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

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 42 – 3D Channel SGD Format .......................RW

7PCM Format

8-bit .....................................................default

16-bit

6-4

# of Channels

000 -invalid- ..................................................default

001 One channel

010 Two channels

011 Three channels

100 Four channels

101 Five channels

110 Six channels

111 -invalid-

3-0

Reserved

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

I/O Offset 43 – Scratch .....................................................RW

7-0

No Assigned Hardware Function

I/O Offset 47-44 – 3D Channel SGD Table Pointer ....... RW

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

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

I/O Offset 4B-48 – 3D Channel SGD Slot-Select............ RW

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

23-20 Slot 9 Data Select

0000 No data assigned to slot 9

0001 1

st data in the sample is assigned to slot9

0010 2

nd data in the sample is assigned to slot9

0011 3

rd data in the sample is assigned to slot9

0100 4

th data in the sample is assigned to slot9

0101 5

th data in the sample is assigned to slot9

0110 6

th data in the sample is assigned to slot9

0111 -invalid-

1xxx -invalid-

19-16 Slot 6 Data Select

15-12 Slot 8 Data Select

11-8 Slot 7 Data Select

7-4

Slot 4 Data Select

3-0

Slot 3 Data Select

I/O Offset 4F-4C – 3D Channel SGD Current Count..... RO

31-24 Current SGD Index

23-0 Current SGD Count

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