VT8235 datasheet(122/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-116-

Device 17 Function 6 Modem Controller Registers

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Modem SGD Write Channel Registers

I/O Offset 50 – Modem SGD Write Channel Status....... RO

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

SGD has completed or been terminated default

SGD Active

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

SGD not paused..................................... default

SGD Paused

5-4

Reserved

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

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

This bit reports whether the trigger used to restart the

SGD operation is queued (I/O Offset 51[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 5B-58[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 51[1] = 1.

SGD Flag

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

Block complete. May be used by software as a

signal to generate an interrupt request if I/O

Offset 51[0] = 1.

I/O Offset 51 – Modem SGD Write Channel Control ....RW

SGD Start

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

No effect

Start SGD write channel operation

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

No effect

Terminate SGD write channel operation

5-4

Test (Do Not Program)

.......................always write 0

SGD Pause .........................................................RW

Release SGD write channel pause and resume

the transfer from the paused line

Pause SGD write channel operation (SGD

write channel pointer stays at current address)

Reserved

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

Reset Modem Write SGD Operation.................RW

Reserved

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

I/O Offset 52 – Modem SGD Write Channel Type ........ RW

Auto-Start SGD at EOL

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

Auto restart at EOL

6-2

Reserved

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

Interrupt on EOL @ End of Block

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

Enable

Interrupt on FLAG @ End-of-Blk

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

Enable

I/O Offset 57-54 – Modem SGD W Ch Table Ptr Base . RW

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

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

I/O Offset 5F-5C – Modem SGD W Ch Current Count. RO

31-24 Current Modem SGD Write Channel Index

This field reports the index the SGD engine is

currently processing.

23-0 Current Modem SGD Write Channel Count

This field reports the count remaining in the current

entry being processed. For example, if 10 bytes of a

30-byte count have been transferred, this field would

read 20 to indicate 20 bytes remaining.

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].

VT8235 Datasheet(PDF) 122 Page - VIA Technologies, Inc.

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