STAC9758 Datasheet, PDF (74/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
8.2.21. Extended Audio Control/Status (2Ah)
Default: 05F0h
D15
VCFG
D7
SDAC
D14
RESERVED
D6
CDAC
D13
PRK
D5
SPSA1
D12
PRJ
D4
SPSA0
D11
PRI
D3
RSRVD
D10
SPCV
D2
SPDIF
D9
RESERVED
D1
DRA
D8
LDAC
D0
VRA enable
Note: If pin 48 is held high at powerup, the SPDIF is not available and bits D15:D1 can not be
written and will read back zero.
Bit(s) Reset Value R/W
15
0
RW
14
0
RO
13
0
RW
12
0
RW
11
0
RW
10
1
RO
9
0
RO
8
1
RO
7
1
RO
6
1
RO
Name
VCFG
RESERVED
PRK
PRJ
PRI
SPCV
RESERVED
LDAC
SDAC
CDAC
Description
Determines the SPDIF transmitter behavior when data is not being
transmitted. When asserted, this bit forces the deassertion of the SPDIF
“Validity” flag, which is bit 28 transmitted by the SPDIF sub-frame. The
“V” bit is defined in the SPDIF Control Register (Reg 3Ah).
If "V" = 1 and "VCFG" = 0, then for each SPDIF sub-frame (Left &
Right), bit[28] "Validity" flag reflects whether or not an internal CODEC
transmission error has occurred. Specifically an internal CODEC error
should result in the "Validity" flag being set to "1".
If "V" = 0 and "VCFG" = 1, In the case where theSPDIF transmitter does
not receive a valid sample from the AC'97 controller, (Left or Right), the
SPDIF transmitter should set the "Validity" flag to "0" and pad the "Audio
Sample Word" with "0"s for sub-frame in question. If a valid sample (Left
or Right) was received and successfully transmitted, the "Validity" flag
should be "0" for that sub-frame.
Default state, coming out of reset, for "V" and "VCFG" should be 0 and
0. These bits should be settable via driver .inf options.
Reserved
0 = PCM LFE DACs on
1 = PCM LFE DACs off
0 = PCM Surround DACs on
1 = PCM Surround DACs off
0 = PCM Center DAC on
1 = PCM Center DAC off
0 = invalid SPDIF configuration
1 = valid SPDIF configuration
Reserved
0 = PCM LFE DAC is not ready
1 = PCM LFE DAC is ready
0 = PCM Surround DAC is not ready
1 = PCM Surround DAC is ready
0 = PCM Center DAC is not ready
1 = PCM Center DAC is ready
IDT™
74
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
V 1.2 1206