VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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The audio / modem interface is compliant with AC97. Refer
to the AC97 specification and AC97 Codec data sheets for
further details.
Read / Write through both functions 5 and 6.
Offset 83-80 – AC97 Controller Command / Status ....... RW
Read / Write through both functions 5 and 6.
......................................................... RW
31-30 Codec ID
00 Select Primary Codec
01 Select Secondary Codec
1x -reserved-
29-28 Reserved
........................................ always reads 0
Secondary Codec Data / Status / Index Valid .RWC
27
0
Not Valid
1
Valid (OK to Read bits 0-23)
........................................ always reads 0
26
Reserved
25
Primary Codec Data / Status / Index Valid.....RWC
0
Not Valid
1
Valid (OK to Read bits 0-23)
24
AC97 Controller Busy ......................................... RO
0
Primary Codec is ready for a register access
command
1
AC97 Controller is sending a command to the
primary codec (commands are not accepted)
Codec Command Register Write Mode ............ RW
23
0
Select Codec command register write mode
1
Select Codec command register read mode
22-16 Codec Command Register Index [7:1] .............. RW
Index of the AC97 codec command register to access
(in the attached codec). Data must be written before
or at the same time as Index as writing to the index
triggers the AC97 controller to access the addressed
codec register over the AC-link interface.
15-0 Codec Command Register Data / Status ........... RW
W Codec Command Register Data
R Codec Status Register Data
Revision 1.71 June 9, 2000
Offset 87-84 – SGD Status Shadow .................................. RO
Read / Only through both functions 5 and 6.
31-30 Reserved
........................................always reads 0
29
Modem Write Chan SGD Active Shadow(Rx50[7])
28
Modem Read Chan SGD Active Shadow (Rx40[7])
........................................always reads 0
27-26 Reserved
25
Modem Write Chan SGD STOP Shadow (Rx50[2])
24
Modem Read Chan SGD STOP Shadow. (Rx40[2])
........................................always reads 0
23-22 Reserved
21
Modem Write Chan SGD EOL Shadow.. (Rx50[1])
20
Modem Read Chan SGD EOL Shadow... (Rx40[1])
19-18 Reserved
........................................always reads 0
17
Modem Write Chan SGD FLAG Shadow(Rx50[0])
16
Modem Read Chan SGD FLAG Shadow (Rx40[0])
15
Reserved
........................................always reads 0
14
FM Channel SGD Active Shadow............ (Rx20[7])
13
Audio Write Chan SGD Active Shadow.. (Rx10[7])
12
Audio Read Chan SGD Active Shadow ... (Rx00[7])
11
Reserved
........................................always reads 0
10
FM Channel SGD STOP Shadow ............ (Rx20[2])
9
Audio Write Chan SGD STOP Shadow .. (Rx10[2])
8
Audio Read Chan SGD STOP Shadow ... (Rx00[2])
7
Reserved
........................................always reads 0
6
FM Channel SGD EOL Shadow .............. (Rx20[1])
5
Audio Write Chan SGD EOL Shadow .... (Rx10[1])
4
Audio Read Chan SGD EOL Shadow ..... (Rx00[1])
........................................always reads 0
3
Reserved
2
FM Channel SGD FLAG Shadow............ (Rx20[0])
1
Audio Write Chan SGD FLAG Shadow.. (Rx10[0])
0
Audio Read Chan SGD FLAG Shadow... (Rx00[0])
Read / Only through function 5 and Read / Write through
function 6:
Offset 8B-88 – Codec GPI Interrupt Status / GPIO ... RWC
31-16 GPI Interrupt Status ........................................ RWC
R GPI[15-0] Interrupt Status
W 1 to clear
15-0 Codec GPIO .........................................................RW
R Reflect status of Codec GPI[15-0]
W Triggers AC-Link slot-12 output to codec
Offset 8F-8C – Codec GPI Interrupt Enable ................. RW
31-16 Interrupt on GPI[15-0] Change of Status..........RW
0
Disable
1
Enable
15-0 Reserved
........................................always reads 0
-113-
Function 5 & 6 Registers - AC97 Audio & Modem Codecs
VT82C686B