CS4299 Datasheet, PDF (30/52 Pages) Cirrus Logic – CrystalClear SoundFusion Audio Codec 97

CS4299
4.18 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
0
0
0 DDM AMAP 0 SM1 SM0 0
0
0
0
DDM
AMAP
SM[1:0]
Default
DAC Direct Mode. This bit controls the source to the line and alternate line output drivers. When
‘set’, the L/R DACs directly drive the line and alternate line outputs by bypassing the audio mix-
er. When ‘clear’, the audio mixer is the source for the line and alternate line outputs.
Audio Slot Mapping. This read/write bit controls whether the CS4299 responds to the Codec ID
based slot mapping as outlined in the AC ’97 2.1 specification. The bit is shadowed in the Ex-
tended Audio ID Register (Index 28h). Refer to Table 8 for the slot mapping configurations.
Slot Map. The SM[1:0] bits define the Slot Mapping for the CS4299 when the AMAP bit is
‘cleared’. Refer to Table 8 for the slot mapping configurations.
0080h
4.19
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
Table 8. Slot Mapping
Misc. Crystal Control Register (Index 60h)
Slot Assignments
DAC,
SPDIF
ADC
LRLR
3434
3434
7878
6969
3434
5656
7878
9 10 9 10
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
Reserved
0
0
Reserved
0
Reserved LOSM
LOSM
Default
Loss of SYNC Mute Enable. The LOSM bit controls the loss of SYNC mute function. If this bit
is ‘set’, the CS4299 will mute all analog outputs for the duration of loss of SYNC. If this bit is
‘cleared’, the mixer will continue to function normally during loss of SYNC. The CS4299 ex-
pects to sample SYNC ‘high’ for 16 consecutive BIT_CLK periods and then ‘low’ for 240 con-
secutive BIT_CLK periods, otherwise loss of SYNC becomes true.
0023h
30