CS8420-CSZ datasheet(36/94 Pages) CIRRUS

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DS245F4

CS8420

10.4

Data Flow Control (03h)

The Data Flow Control register configures the flow of audio data to/from the following blocks:

Serial Audio Input Port, Serial Audio Output Port, AES3 receiver, AES3 transmitter, and Sample

Rate Converter. In conjunction with the Clock Source Control register, multiple Receiver/Trans-

mitter/Transceiver modes may be selected. The output data should be muted prior to changing

bits in this register to avoid transients.

AMLL

Auto Mutes the SRC data sink when Receiver lock is lost, zero data is transmitted. The SRC

data sink may be either, or both, the Transmitter and the Serial Audio Output Port.

0 - Disables Auto Mute on loss of lock (default)

1 - Enables Auto Mute on loss of lock

TXOFF

AES3 Transmitter Output Driver Control

0 - AES3 transmitter output pin drivers normal operation (default)

1 - AES3 transmitter output pin drivers drive to 0 V.

AESBP

AES3 bypass mode selection

0 - normal operation

1 - Connect the AES3 transmitter driver input directly to the RXP pin, which become a normal

TTL threshold digital input.

TXD[1:0]

AES3 Transmitter Data Source

00 - SRC output (default)

01 - Serial audio input port

10 - AES3 receiver

11 - Reserved

SPD[1:0]

Serial Audio Output Port Data Source

00 - SRC output (default)

01 - Serial Audio Input Port

10 - AES3 receiver

11 - Reserved

SRCD

Input Data Source for SRC

0 - Serial Audio Input Port (default)

1 - AES3 Receiver

AMLL

TXOFF

AESBP

TXD1

TXD0

SPD1

SPD0

SRCD

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