VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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Read / Write through function 5, R/O through function 6.
The following set of registers is dedicated for FM:
I/O Offset 20 – FM SGD Read Channel Status ........... RWC
7
SGD Active (0 = completed or terminated)........RO
6
SGD Paused ..........................................................RO
5-4
Reserved
........................................ always reads 0
3
SGD Trigger Queued (will restart after EOL) ..RO
2
SGD Stopped (write 1 to resume) ...................RWC
1
SGD EOL
......................................................RWC
0
SGD Flag
......................................................RWC
I/O Offset 21 – FM SGD Read Channel Control ............ RW
7
SGD Start ............................ WO (always reads 0)
0
No effect
1
Start SGD read channel operation
6
SGD Terminate ...................... WO (always reads 0)
0
No effect
1
Terminate SGD read channel operation
5-4
Reserved
.....always reads 0, writing 1 not allowed
3
SGD Pause .........................................................RW
0
Release SGD read channel pause and resume
the transfer from the paused line
1
Pause SGD read channel operation (SGD read
channel pointer stays at the current address)
2-0
Reserved
........................................ always reads 0
I/O Offset 22 – FM SGD Read Channel Type ................ RW
7
Auto-Start SGD at EOL (1=Enable) ....... default = 0
6-4
Reserved
........................................ always reads 0
3-2
Interrupt Select
00 Interrupt at PCI Read of Last Line .........default
01 Interrupt at Last Sample Sent
10 Interrupt at Less Than One Line to Send
11 -reserved-
1
Interrupt on EOL @ End of Block
0
Disable ...................................................default
1
Enable
0
Interrupt on FLAG @ End-of-Blk
0
Disable ...................................................default
1
Enable
I/O Offset 27-24 – FM SGD Rd Ch Table Pointer Base RW
31-0 SGD Table Pointer Base Address (even addr).....W
Current Pointer Address ........................................R
I/O Offset 2F-2C – FM SGD Rd Chan Current Count ... RO
........................................ always reads 0
31-24 Reserved
23-0 Current SGD FM Read Channel Count
Revision 1.71 June 9, 2000
-111-
Function 5 & 6 Registers - AC97 Audio & Modem Codecs
VT82C686B