CS4349 datasheet(32/40 Pages) CIRRUS

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DS782F1

CS4349

8.4

Mute Control - Register 04h

8.4.1

Auto-Mute (AMUTE) Bit 7

Function:

When set to 1 (default), the Digital-to-Analog converter output will mute following the reception of 8192

consecutive audio samples of static 0 or -1. A single sample of non-static data will release the mute. De-

tection and muting is done independently for each channel. The quiescent voltage on the output will be

retained, and the Mute Control pin will go active during the mute period.

When set to 0, this function is disabled

8.4.2

AMUTEC = BMUTEC (MUTEC A=B) Bit 5

Function:

When set to 0 (default), the AMUTEC and BMUTEC pins operate independently.

When set to 1, the individual controls for AMUTEC and BMUTEC are internally connected through an

AND gate prior to the output pins. Therefore, the external AMUTEC and BMUTEC pins go active only

when the requirements for both AMUTEC and BMUTEC are valid.

8.4.3

Channel A Mute (MUTE_A) Bit 4 & Channel B Mute (MUTE_B) Bit 3

Function:

When set to 1, the Digital-to-Analog converter output will mute. The quiescent voltage on the output will

be retained. The muting function is effected, similar to attenuation changes, by the Soft and Zero Cross

bits in the Volume and Mixing Control register. The corresponding MUTEC pin will go active following any

ramping due to the soft and zero cross function.

When set to 0 (default), this function is disabled.

000

MUTE

001

b[(L+R)/2]

a[(L+R)/2]

MUTE

a[(L+R)/2]

b[(L+R)/2]

543

AMUTE

Reserved

MUTEC A=B

MUTE_A

MUTE_B

Reserved

000

ATAPI_A1 ATAPI_A0 ATAPI_B1 ATAPI_B0

AOUTA

AOUTB

Table 4. ATAPI Decode

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