CS4299-BQ(2002) View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS4299-BQ
(Rev.:2002)

CrystalClear SoundFusion™ Audio Codec ’97

Cirrus Logic 

CS4299-BQ

3.3 AC-Link Protocol Violation - Loss of

SYNC

The CS4299-BQ is designed to handle SYNC pro-

tocol violations. The following are situations where

the SYNC protocol has been violated:

• The SYNC signal is not sampled high for exact-

ly 16 BIT_CLK clock cycles at the start of an

audio frame.

• The SYNC signal is not sampled high on the

256th BIT_CLK clock period after the previous

SYNC assertion.

• The SYNC signal goes active high before the

256th BIT_CLK clock period after the previous

SYNC assertion.

Upon loss of synchronization with the controller,

the CS4299-BQ will ‘clear’ the Codec Ready bit in

the serial data input frame until two valid frames

are detected. During this detection period, the

CS4299-BQ will ignore all register reads and

writes and will discontinue the transmission of

PCM capture data. In addition, if the LOSM bit in

the Misc. Crystal Control Register (Index 60h) is

‘set’ (default), the CS4299-BQ will mute all analog

outputs. If the LOSM bit is ‘clear’, the analog out-

puts will not be muted.

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