CS4201 Datasheet, PDF (35/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

CS4201
4.23 AC Mode Control Register (Index 5Eh)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0 ASPM 0
0 DDM AMAP SPAS SM1 SM0 0
0
0
0
ASPM
DDM
AMAP
SPAS
SM[1:0]
Default
Analog S/PDIF Mode. The ASPM bit controls the input source to the S/PDIF transmitter block.
When ‘clear’, the S/PDIF transmitter will receive data from the corresponding AC-link output
slots. The actual slots are determined by the state of the SPAS bit. If ‘set’, the S/PDIF trans-
mitter block will receive data from the ADC output.
DAC Direct Mode. The DDM bit controls the source of the line output drivers. When this bit is
‘clear’, the CS4201 stereo output mixer drives the line output. When this bit is ‘set’, the
CS4201 audio DACs (DAC1 and DAC2) directly drive the line output.
Audio Slot Mapping. The AMAP bit controls whether the CS4201 responds to the Codec ID
based slot mapping as outlined in the AC ’97 2.1 Specification. This bit is shadowed in the
Extended Audio ID Register (Index 28h). Refer to Table 10 for the slot mapping configura-
tions.
Alternate S/PDIF Slot Mapping. The SPAS bit controls the mapping of output slots to the
S/PDIF transmitter. If this bit is ‘clear’ (default), the S/PDIF transmitter will receive data from
the same slots as the DACs. If this bit is ‘set’, alternate (independent) slots will be routed to
the S/PDIF transmitter. The alternate slots are the same as the SDO2 slots in Table 10.
Slot Map. The SM[1:0] bits define the Slot Mapping for the CS4201 when the AMAP bit is
‘cleared’. Refer to Table 10 for the slot mapping configurations.
0080h
Slot
Assignment
Mode
Codec ID Slot Map
AMAP
ID1 ID0 SM1 SM0
AMAP Mode 0 0 0 X X
1
AMAP Mode 1 0 1 X X
1
AMAP Mode 2 1 0 X X
1
AMAP Mode 3 1 1 X X
1
Slot Map Mode 0 X X 0 0
0
Slot Map Mode 1 X X 0 1
0
Slot Map Mode 2 X X 1 0
0
Slot Map Mode 3 X X 1 1
0
DAC
SPDIF for
SPAS = 0
LR
34
34
78
69
34
78
69
5 11
Slot Assignments
SDOUT
SDO2
SPDIF for
SPAS = 1
LRLR
7869
7869
6 9 10 11
7 8 10 11
7869
6 9 10 11
7 8 10 11
7869
Table 10. Slot Mapping for the CS4201
ADC
LR
34
34
78
78
34
78
78
56
DS483PP3
35