Owner manual

CS4297A

4.17 AC Mode Control Register (Index 5Eh)

DDM 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.

AMAP Audio Slot Mapping. This read/write bit controls whether the CS4297A responds to the Codec

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 7 for the slot mapping configurations.

SM[1:0] Slot Map. The SM[1:0] bits define the Slot Mapping for the CS4297A when the AMAP bit is

‘cleared’. Refer to Table 7 for the slot mapping configurations.

Default 0080h

4.18 Misc. Crystal Control Register (Index 60h)

LOSM Loss of SYNC Mute Enable. The LOSM bit controls the loss of SYNC mute function. If this bit

is ‘set’, the CS4297A 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 CS4297A

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.

Default 0023h

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

0000000DDMAMAP0SM1SM00000

Slot

Assignment

Mode

Codec ID Slot Map

AMAP

Slot Assignments

ID1 ID0 SM1 SM0

DAC,

SPDIF

ADC

LRLR

AMAP Mode 000XX 1 3434

AMAP Mode 101XX 1 3434

AMAP Mode 210XX 1 7878

AMAP Mode 311XX 1 6969

Slot Map Mode 0XX00 0 3434

Slot Map Mode 1XX01 0 5656

Slot Map Mode 2XX10 0 7878

Slot Map Mode 3 X X 1 1 0 9 10 9 10

Table 7. Slot Mapping

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

0000 Reserved 00Reserved0ReservedLOSM

DS318PP6 29

CS4297A