VT82C686B
Offset 42 – Function Enable.......................RW (Function 5)
Offset 42 – Function Enable........................RO (Function 6)
Offset 44 – MC97 Interface Control .......... RO (Function 5)
Offset 44 – MC97 Interface Control ......... RW (Function 6)
7
6
5
4
AC-Link Interface for Slot-5
7
6
5
4
3
2
1
0
MIDI PnP
0
Disable................................................... default
0
MIDI Port Address Selected by Rx43[3-2]. def
1
Enable
1
MIDI Port Address Selected by IOBase2
Secondary Codec Support
Mask MIDI IRQ
0
Disable................................................... default
0
Disable ...................................................default
1
Enable
1
Enable
Function 6 Config Reg Rx9-B Writable
Function 5 Config Reg Rx2C Writable
0
F6Rx9-B RO.......................................... default
0
F5Rx2C-2F RO ......................................default
1
F6Rx9-B RW
1
F5Rx2C-2F RW
Function 6 Config Reg 2Ch Writable
Gate SoundBlaster PCM When FIFO Empty
0
F6Rx2C-2F RO...................................... default
0
Disable ...................................................default
1
F6Rx2C-2F RW
1
Enable
........................................always reads 0
3-0 Reserved
Game Port Enable (ENGAME)
0
Disable ...................................................default
1
Enable (200-207h)
FM Enable (ENFM)
Offset 48 – FM NMI Control..................... RW (Function 5)
Offset 48 – FM NMI Control...................... RO (Function 6)
0
Disable ...................................................default
1
Enable (388-38B)
........................................always reads 0
FM IRQ Select
7-3 Reserved
MIDI Enable (ENMIDI)
2
1
0
0
Disable ...................................................default
0
Route FM Trap interrupt to NMI........... default
1
Enable
1
Route FM Trap interrupt to SMI
SoundBlaster Enable (ENSB)
FM SGD Data for SoundBlaster Mixing
0
Disable ...................................................default
0
Disable................................................... default
1
Enable
1
Enable
FM Trap Interrupt
0
Enable
Offset 43 – Plug and Play Control .............RW (Function 5)
Offset 43 – Plug and Play Control ..............RO (Function 6)
1
Disable .................................................. default
Offset 4B-4A – Game Port Base Address ....................... RW
.........................default = 0
7-6 SoundBlaster IRQ Select (SBIRQS[1:0])
00 IRQ5 .....................................................default
01 IRQ7
15-0 Game Port Base Address
10 IRQ9
11 IRQ10
5-4 SoundBlaster DRQ Select (SBDRQS[1:0])
00 DMA Channel 0
01 DMA Channel 1 .....................................default
10 DMA Channel 2
11 DMA Channel 3
3-2 MIDI Decode Select (MIDIBASE)
00 300-303h
01 310-313h
10 320-323h
11 330-333h ................................................default
1-0 SoundBlaster Decode Select (SBBASE)
00 220-22Fh................................................default
01 240-24Fh
10 260-26Fh
11 280-28Fh
Revision 1.71 June 9, 2000
-109- Function 5 & 6 Registers - AC97 Audio & Modem Codecs
ETC [ ETC ]
