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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002 -33- Register Overview

Function 5 I/O Base 0 Registers – AC97 Audio S/G DMA

Offset

AC97 SGD I/O Re

isters Default Acc

x0 SGD Channel x Status 00

x1 SGD Channel x Control 00 RW

x2 SGD Channel x Left Volume

x3 SGD Channel x Right Volume

x7-x4 SGD Channel x Table Pointer Base

SGD Channel x Current Address

0000 0000 WR

xB-x8 Stop Index / Data Type / Sample Rate

FF0F FFFF

xF-xC SGD Channel x Current Count 0000 0000

40 SGD 3D Channel Status 00

41 SGD 3D Channel Control 00 RW

42 SGD 3D Channel Format 00 RW

43 SGD 3D Channel Scratch 00 RW

47-44 SGD 3D Channel Table Pointer Base

SGD 3D Channel Current Address

0000 0000 WR

4B-48 SGD 3D Channel Slot Select

FF00 0000

4F-4C SGD 3D Channel Current Count 0000 0000

50-5F -reserved- 00 —

60 SGD Write Channel 0 Status 00

61 SGD Write Channel 0 Control 00 RW

62 SGD Write Channel 0 Format 00 RW

63 SGD Write Channel 0 Select 00 RW

67-64 SGD Write Channel 0 Table Ptr Base

SGD Write Channel 0 Current Addr

0000 0000 WR

6B-68 SGD Write Channel 0 Stop Index

FF00 0000

6F-6C SGD Write Channel 0 Current Count 0000 0000

70 SGD Write Channel 1 Status 00

71 SGD Write Channel 1 Control 00 RW

72 SGD Write Channel 1 Format 00 RW

73 SGD Write Channel 1 Select 00 RW

77-74 SGD Write Channel 1 Table Ptr Base

SGD Write Channel 1 Current Addr

0000 0000 WR

7B-78 SGD Write Channel 1 Stop Index

FF00 0000

7F-7C SGD Write Channel 1 Current Count 0000 0000

Offset

AC97 / Audio Codec I/O Registers Default Acc

83-80 AC97 Controller Command / Status 0000 0000 RW

87-84 SGD Global IRQ Shadow 0000 0000

8B-88 Modem Codec GPI Intr Status / GPIO 0000 0000

8F-8C Modem Codec GPI Interrupt Enable 0000 0000

90-9F Shadow PCI Config Registers 40-4F n/a

A0-FF -reserved- 00 —

Function 6 I/O Base 0 Registers – MC97 Modem S/G DMA

Offset

MC97 SGD I/O Registers

Default Acc

0-7 -reserved- 00 —

8-F -reserved- 00 —

10-17 -reserved- 00 —

18-1F -reserved- 00 —

20-27 -reserved- 00 —

28-2F -reserved- 00 —

30-37 -reserved- 00 —

38-3F -reserved- 00 —

40 SGD Read Channel Status 00

41 SGD Read Channel Control 00 RW

42 SGD Read Channel Type 00 RW

43 -reserved- 00 —

47-44 SGD Read Chan Table Pointer Base

SGD Read Channel Current Address

0000 0000 WR

4B-48 -reserved- (Test) 0000 0000

4F-4C SGD Read Channel Current Count 0000 0000

50 SGD Write Channel Status 00

51 SGD Write Channel Control 00 RW

52 SGD Write Channel Type 00 RW

53 -reserved- 00 —

57-54 SGD Write Channel Table Ptr Base

SGD Write Channel Current Address

0000 0000 WR

5B-58 Reserved (Test) 0000 0000

5F-5C SGD Write Channel Current Count 0000 0000

60-7F -reserved- 00 —

Offset AC97 / Modem Codec I/O Registers Default Acc

83-80 AC97 Controller Command / Status 0000 0000 RW

87-84 SGD Global IRQ Shadow 0000 0000

8B-88 Modem Codec GPI Intr Status / GPIO 0000 0000

8F-8C Modem Codec GPI Interrupt Enable 0000 0000 RW

90-9F Shadow PCI Config Registers 40-4F n/a

A0-FF -reserved- 00 —