CS8427-CSZ datasheet(29/60 Pages) CIRRUS

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CS8427

DS477F5

MMR - Select AES3 receiver mono or stereo operation

Default = ‘0’

0 - Normal stereo operation

1 - A and B subframes treated as consecutive samples of one channel of data. Data is duplicated to

both left and right parallel outputs of the AES receiver block. The input sample rate (Fsi) is doubled

compared to MMR=0

MMT - Select AES3 transmitter mono or stereo operation

Default = ‘0’

0 - Normal stereo operation

1 - Output either left or right channel inputs into consecutive subframe outputs (mono

mode, left or right is determined by MMTLR bit)

MMTCS - Select A or B channel status data to transmit in mono mode

Default = ‘0’

0 - Use channel A CS data for the A subframe and use channel B CS data for the B subframe

1 - Use the same CS data for both the A and B subframe outputs. If MMTLR = 0, use the

left channel CS data. If MMTLR = 1, use the right channel CS data.

MMTLR - Channel Selection for AES Transmitter mono mode

Default = ‘0’

0 - Use left channel input data for consecutive subframe outputs

1- Use right channel input data for consecutive subframe outputs

11.3 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, and AES3 transmitter. In conjunction with the Clock Source Control regis-

ter, multiple Receiver/Transmitter/Transceiver modes may be selected. The output data should be muted prior to

changing bits in this register to avoid transients.

TXOFF - AES3 Transmitter Output Driver Control

Default = ‘0

0 - AES3 transmitter output pin drivers normal operation

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

AESBP - AES3 bypass mode selection

Default = ‘0’

0 - Normal operation

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

threshold digital input. The transmitter clock (selecting using the OUTC bit in the Clock Source Control)

must be present for the bypass mode to work.

TXD1:TXD0 - AES3 Transmitter Data Source

Default = ‘01’

00 - Reserved

01 - Serial audio input port

10 - AES3 receiver

11 - Reserved

TXOFF

AESBP

TXD1

TXD0

SPD1

SPD0

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