VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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Function 5 & 6 Registers - AC97 Audio & Modem Codecs
The codec interface is hardware compatible with AC97 and
SoundBlaster Pro. There are two sets of software accessible
registers: PCI configuration registers and I/O registers. The
PCI configuration registers for the Audio Codec are located in
the function 5 PCI configuration space of the VT82C686B.
The PCI configuration registers for the Modem Codec are
located in the function 6 PCI configuration space. The I/O
registers are located in the system I/O space.
PCI Configuration Space Header – Function 5 Audio
Offset 1-0 - Vendor ID ....................................................... RO
0-7
Vendor ID ................. (1106h = VIA Technologies)
Offset 3-2 - Device ID ......................................................... RO
0-7
Device ID
(3058h = 82C686B Audio Codec)
Offset 5-4 - Command ....................................................... RW
15-10 Reserved
........................................ always reads 0
Fast Back-to-Back.......................................fixed at 0
9
8
SERR# Enable.............................................fixed at 0
Address Stepping ........................................fixed at 0
7
6
Parity Error Response................................fixed at 0
VGA Palette Snoop .....................................fixed at 0
5
4
Memory Write and Invalidate ...................fixed at 0
Special Cycle Monitoring ...........................fixed at 0
3
2
Bus Master .................................................fixed at 0
Memory Space.............................................fixed at 0
1
0
I/O Space
............................... default=0 (disabled)
Offset 7-6 - Status ........................................................... RWC
15
Detected Parity Error ........................ always reads 0
Signalled System Error.............................. default=0
14
13
Received Master Abort...............................fixed at 0
Received Target Abort ...............................fixed at 0
12
11
Signalled Target Abort ...............................fixed at 0
10-9 DEVSEL# Timing
00 Fast
01 Medium .................................................... fixed
10 Slow
11 Reserved
8
Data Parity Error........................................fixed at 0
7
Fast Back-to-Back Capable........................fixed at 0
........................................ always reads 0
6-5
Reserved
4
PM 1.1
.................................................fixed at 1
........................................ always reads 0
3-0
Reserved
Offset 8 - Revision ID (nnh) ............................................... RO
7-0
Silicon Revision Code
10h Revision A
11h Revision B
12h Revision C
13h Revision D
14h Revision E
20h Revision H
Revision 1.71 June 9, 2000
Offset 9 - Programming Interface (00h) ........................... RO
Offset A - Sub Class Code (01h=Audio Device) ............... RO
Offset B - Base Class Code (04h=Multimedia Device) ..... RO
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 17-14 - Base Address 1 – FM NMI Status ........... RW
........................................always reads 0
31-16 Reserved
15-2 Base Address..................................... default = 0000h
1-0
01b (4 bytes)
Offset 1B-18 - Base Address 2 – MIDI Port ................... RW
31-16 Reserved
........................................always reads 0
15-2 Base Address..................................... default = 0330h
1-0
01b (4 bytes)
Offset 1F-1C - Base Address 3 – Codec Register Shadow RW
........................................always reads 0
31-16 Reserved
15-2 Base Address..................................... default = 0000h
1-0
01b (4 bytes)
Offset 2F-2C – Subsystem ID / Sub Vendor ID ............. RO*
*This register is RW if function 5-6 Rx42[5] = 1
Offset 34 – Capture Pointer (C0h) ................................... RO
Offset 3C - Interrupt Line ................................................ RW
........................................always reads 0
7-4
Reserved
3-0
Audio Interrupt Routing
0000 Disable................................................... 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 Disable
Offset 3D - Interrupt Pin (03h) ......................................... RO
Offset 3E - Minimum Grant (00h) .................................... RO
Offset 3F - Minimum Latency (00h) ................................. RO
-106-
Function 5 & 6 Registers - AC97 Audio & Modem Codecs
VT82C686B