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

CS4299-BQ
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-BQ responds to the Co-
dec ID based slot mapping as outlined in the AC ’97 2.1 specification. The bit is shadowed in
the Extended Audio ID Register (Index 28h). Refer to Table 8 for the slot mapping configura-
tions.
Slot Map. The SM[1:0] bits define the Slot Mapping for the CS4299-BQ 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-BQ 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-BQ expects to sample SYNC ‘high’ for 16 consecutive BIT_CLK periods and then
‘low’ for 240 consecutive BIT_CLK periods, otherwise loss of SYNC becomes true.
0023h
30