STAC9752A Datasheet, PDF (68/106 Pages) Integrated Device Technology – AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

STAC9752A/9753A
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
PC AUDIO
7.1.24.
SPDIF Control (3Ah)
Default: 2000h
D15
V
D7
CC3
D14
DRS
D6
CC2
Bit(s) Reset Value
15 in 2.3
D13
SPSR1
D5
CC1
D12
SPSR2
D4
CC0
D11
L
D3
PRE
D10
CC6
D2
COPY
D9
CC5
D1
/AUDIO
D8
CC4
D0
PRO
Access
Name
V
Description (note 1-2)
Validity: This bit affects the "Validity" flag, bit<28>, transmitted in
each S/PDIF subframe, and enables the S/PDIF transmitter to
maintain connection during error or mute conditions. Subframe
bit<28>=0 indicates that data is valid for conversion at the
receiver, 1 indicates invalid data (not suitable for conversion at
the receiver).
14
13:12
11
10:4
3
2
1
0
If “V” = 1, then each S/PDIF subframe (Left & Right) should have
bit<28> “Validity” flag = 1 or set based on the assertion or
de-assertion of the AC '97 “VFORCE” bit within the Extended
Audio Status and Control Register (D15, register 2Ah).
0
Read Only
DRS 1 = Double Rate SPDIF support (always = 0)
SPDIF Sample Rate.
00 - 44.1 KHz Rate
10
Read & Write SPSR[1,0] 01 - Reserved
10 - 48 KHz Rate (default)
11 - 32 KHz Rate
0
Read & Write
L
Generation Level is defined by the IEC standard, or as
appropriate.
0
Read & Write
CC[6, 0]
Category Code is defined by the IEC standard or as appropriate
by media.
0
Read & Write
PRE
0 = 0 µsec Pre-emphasis
1 = Pre-emphasis is 50/15 µsec
0
Read & Write
COPY
0 = Copyright not asserted
1 = Copyright is asserted
0
Read & Write
/AUDIO
0 = PCM data
1 = Non-Audio or non-PCM format
0
Read & Write
PRO
0 = Consumer use of the channel
1 = Professional use of the channel
7.2. General Purpose Input & Outputs
7.2.1.
EAPD
EAPD can act as a GPIO, but is unaffected by the following registers. To use EAPD as a GPIO, use
Register 74h, the EAPD Access Register. Information about this register is located in Section
7.4.11: page82. Additional information about EAPD can also be found in Section 7.1.18.3:
page63.
IDT™
68
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
V 1.5 1206