CS4201 Datasheet, PDF (21/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

CS4201
3.3 AC-Link Protocol Violation - Loss of
SYNC
The CS4201 is designed to handle SYNC protocol
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 CS4201 will mute all analog outputs and ‘clear’
the Codec Ready bit in the serial data input frame
until two valid frames are detected. During this de-
tection period, the CS4201 will ignore all register
reads and writes and will discontinue the transmis-
sion of PCM capture data.
DS483PP3
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