VT8231 datasheet(115/132 Pages) ETC

115 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-109-

Function 5 & 6 Registers - AC97 Audio & Modem Codecs

7HFKQRORJLHV ,QF

:H &RQQHFW

PCI Configuration Space Header – Function 6 Modem

Offset 1-0 - Vendor ID .......................................................RO

0-7

Vendor ID

................. (1106h = VIA Technologies)

Offset 3-2 - Device ID.........................................................RO

0-7

Device ID

(3068h = 8231 Modem Codec)

Offset 5-4 - Command.......................................................RW

15-10 Reserved

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

Fast Back-to-Back.......................................fixed at 0

SERR# Enable.............................................fixed at 0

Address Stepping ........................................fixed at 0

Parity Error Response ................................fixed at 0

VGA Palette Snoop .....................................fixed at 0

Memory Write and Invalidate ...................fixed at 0

Special Cycle Monitoring ...........................fixed at 0

2Bus Master .................................................fixed at 0

Memory Space.............................................fixed at 0

I/O Space

............................... default=0 (disabled)

Offset 7-6 - Status ...........................................................RWC

Detected Parity Error .................................fixed at 0

Signalled System Error...............................fixed at 0

Received Master Abort...............................fixed at 0

Received Target Abort ...............................fixed at 0

Signalled Target Abort ...............................fixed at 0

10-9 DEVSEL# Timing

00 Fast

01 Medium .................................................... fixed

10 Slow

11 Reserved

Data Parity Error........................................fixed at 0

Fast Back-to-Back Capable........................fixed at 0

6-0

Reserved

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

Offset 8 - Revision ID (nnh) ...............................................RO

7-0

Silicon Revision Code (0 indicates first silicon)

Offset 9 - Programming Interface (00h) .........................*RO

Offset A - Sub Class Code (80h) ......................................*RO

Offset B - Base Class Code (07h).....................................*RO

*Registers 9-B are RW if function 5-6 Rx44[5] = 1

Offset D - Latency Timer (00h) .........................................RO

Offset E - Header Type (00h) ............................................RO

Offset F - BIST (00h)..........................................................RO

Offset 13-10 - Base Address 0 – SGD Control / Status .. RW

31-16 Reserved

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

15-8 Base Address ......................................... default = 00h

7-0

00000001b (256 bytes)

Offset 1F-1C - Base Address 3 – Codec Reg Shadow .... RW

31-16 Reserved

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

15-8 Base Address ......................................... default = 00h

7-0

00000001b (256 bytes)

Offset 3C - Interrupt Line................................................ RW

7-4

Reserved

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

3-0

Audio Interrupt Routing

0000 Disabled ................................................. default

0001 IRQ1

0010 Reserved

0011 IRQ3

0100 IRQ4

0101 IRQ5

0110 IRQ6

0111 IRQ7

1000 IRQ8

1001 IRQ9

1010 IRQ10

1011 IRQ11

1100 IRQ12

1101 IRQ13

1110 IRQ14

1111 Disabled

Offset 3D - Interrupt Pin (03h) ......................................... RO

Offset 3E - Minimum Grant (00h) .................................... RO

Offset 3F - Maximum Latency (00h) ................................ RO

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