VT8235 datasheet(109/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-103-

Device 17 Function 5 Audio Controller Registers

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I/O Base 0 Regs – Audio Scatter / Gather DMA

DXS Channel 0-3 SGD Registers (x = 0-3)

I/O Offset x0 – DXS Channel x SGD Status.................RWC

SGD Active ......................................................... RO

SGD has completed or been terminated default

SGD Active

6-5

Reserved

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

Current SGD Index Equals Stop Index ............ RO

SGD index not equal to stop index........ default

SGD index being processed equals the stop

index.

This bit differs from bit-2 of this

the SGD reaches the index equal to the stop

index. Bit-2 becomes 1 after the SGD finishes

processing the index equal to the stop index.

So this bit will always turn on before bit-2.

SGD Trigger Queued .......................................... RO

This bit reports whether the trigger used to restart the

SGD operation is queued (I/O Offset x1[1] = 1 while

the SGD engine is running).

SGD trigger not queued......................... default

SGD trigger queued (when SGD reaches EOL,

it will restart).

SGD Stop Interrupt Status..............................RWC

SGD finished the index equal to the stop index

set in xB-x8[31-24].

SGD EOL (End Of Link).................................RWC

Block is the last of the link. May be used by

software as a signal to generate an interrupt

request if I/O Offset x1[1] = 1.

SGD Flag

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

Block complete. May be used by software as a

signal to generate an interrupt request if I/O

Offset x1[0] = 1.

I/O Offset x1 – DXS Channel x SGD Control ................ RW

SGD Start

............................WO (always reads 0)

No effect

Start SGD operation

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

No effect

Terminate SGD operation

SGD Auto-Start

Stop at EOL ........................................... default

Auto Restart at EOL

Reserved

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

SGD Pause

Release pause and resume the transfer

Pause SGD read operation (SGD pointer stays

at the current address).

SGD will finish

transferring the current block before pausing.

Interrupt on Stop Index = Current Index and End

of Block

Controls whether an interrupt is generated when the

current index equals the stop index (x0[2] = 1).

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

Enable

Interrupt on EOL @ End of Block

Controls whether an interrupt is generated on EOL

(x0[1] = 1).

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

Enable

Interrupt on FLAG @ End-of-Block

Controls whether an interrupt is generated on FLAG

(x0[0] = 1).

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

Enable

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