CS4298 Datasheet, PDF (35/52 Pages) Cirrus Logic – SoundFusion Audio/Modem Codec 97 (AMC 97)

CS4298
6.1.35 AC Mode Control (Index 5Eh)
D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
EDM EAM DDM
MD1 MD0
DDM
EAM
EDM
MD[1:0]
Default
DAC Direct Mode. This bit controls the source to the line and alternate line output drivers. When set, the
Left and Right DAC directly drive the line and alternate line outputs by bypassing the audio mixer. When
clear, the audio mixer is the source for the line and alternate line outputs.
Extended Audio Mode. When set the output of MDAC2 and MDAC1 are mapped to the ALT_LINE OUT-
PUT. The MDAC volumes are set by the Alternate Line Volume (Index 04h) register when in this mode.
Extended Docking Mode. When set the output of the analog input mixer is routed to the MADC1 and
MADC2 inputs. This allows any analog input mix to be digitized and routed to a second AC ‘97 codec
or allows the host controller to add effects processing to analog sources.
Mode. Sets basic operating mode for the codec. This effects the mapping of the ADCs and DACs to AC-
LINK Slot locations. See the Mode of Operation subsection for additional detail. Table XXX below details
the Slot mapping.
0000h
Mode Definition
0
Basic
1
2 Line
2 Speakerphone
3
Extended 4
Channel
Audio
DAC1
Left
3
Left
3
Left
3
Surrnd
Left
7
Audio
DAC2
Right
4
Right
4
Right
4
Surrnd
Right
8
Audio
ADC1
Left
3
Left
3
Left
3
Audio
ADC2
Right
4
Right
4
Right
4
Modem
DAC1
Line 1
5
Line 1
5
Line 1
5
Left
Right Center
3
4
6
Table 9. Slot Assignments
Modem
DAC2
Handset
11
Line 2
10
Handset
11
LFE
9
Modem
ADC1
Line 1
5
Line 1
5
Line 1
5
Line 1
5
Modem
ADC2
Handset
11
Line 2
10
Mic
6
Handset
11
GPIO
12
12
12
12
6.1.36 S/PDIF Control (Index 68h)
D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
SPEN V
0
0
L CC6 CC5 CC4 CC3 CC2 CC1 CC0 Pre Copy #Audio 0
SPEN
V
L
CC[6:0]
Pre
Copy
#Audio
Default
S/PDIF Enable. When set, Slot 6 and Slot 9 are mapped to the SPDIF_OUT pin. When in Mode 3 and
SPEN set, data is not passed to Modem DAC1 and Modem DAC2.
Validity Bit. When set, this bit notifies the S/PDIF receiver that the subframe data is not suitable for con-
version.
Generation Level.
Category Code.
Premphasis. If set, filter premphasis is 50/15 µs. If clear, premphasis is none.
Copyright. When clear, copyright is asserted. If clear, copyright is not asserted.
#Audio valid. When clear, the data routed to the S/PDIF transmitter contains valid PCM data. For trans-
mitting all other compressed data formats, the #Audio bit must be set.
0000h.
DS315PP2
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