CS4299 datasheet(30/52 Pages) CIRRUS

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CS4299

4.18

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 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.

SM[1:0]

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.

Default

0080h

4.19

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 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.

Default

0023h

D15

D14

D13

D12

D11

D10

DDM

AMAP

SM1

SM0

Slot

Assignment

Mode

Codec ID

Slot Map

AMAP

Slot Assignments

ID1

ID0 SM1 SM0

DAC,

SPDIF

ADC

AMAP Mode 0

3434

AMAP Mode 1

3434

AMAP Mode 2

7878

AMAP Mode 3

6969

Slot Map Mode 0

3434

Slot Map Mode 1

5656

Slot Map Mode 2

7878

Slot Map Mode 3

Table 8. Slot Mapping

D15

D14

D13

D12

D11

D10

Reserved

LOSM

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