Cirrus Logic CS8427 - Manual (Page 29)

CS8427
DS477F5 29
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
7 6 5 4 3 2 1 0
0 TXOFF AESBP TXD1 TXD0 SPD1 SPD0 0