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CS47L85 Datasheet(PDF) 171 Page - Cirrus Logic

Part # CS47L85
Description  Low-Power Smart Codec with Seven DSP Cores, Voice and Media Enhancement, and Integrated Sensor Hub
PDF  370 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS47L85 Datasheet(HTML) 171 Page - Cirrus Logic

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CS47L85
Rev 4.3
171
Figure 56 shows an example of Left Justified format. Six enabled channels are shown.
LRCLK
Slot 0
Slot 2
Slot 4
...
Slot 1
Slot 3
Slot 5
...
Slot 0
Channel 1
Channel 4
BCLK
TXDAT/
RXDAT
Channel 2
Slot 4
Channel 3
Slot 3
Channel 6
Slot 1
Slot 2
Channel 5
Slot 5
AIF1[TX5/RX5]_SLOT = 0
AIF1[TX6/RX6]_SLOT = 2
AIF1[TX2/RX2]_SLOT = 4
AIF1[TX3/RX3]_SLOT = 1
AIF1[TX1/RX1]_SLOT = 5
AIF1[TX4/RX4]_SLOT = 3
Figure 56 Left Justifed Example
TDM OPERATION BETWEEN THREE OR MORE DEVICES
The AIF operation described above illustrates how multiple audio channels can be interleaved on a single TXDAT or RXDAT
pin. The interface uses Time Division Multiplexing (TDM) to allocate time periods to each of the audio channels in turn.
This form of TDM is implemented between two devices, using the electrical connections illustrated in Figure 47 or Figure 48.
It is also possible to implement TDM between three or more devices. This allows one CODEC to receive audio data from
two other devices simultaneously on a single audio interface, as illustrated in Figure 57, Figure 58 and Figure 59.
The CS47L85 provides full support for TDM operation. The TXDAT pin can be tri-stated when not transmitting data, in order
to allow other devices to transmit on the same wire. The behaviour of the TXDAT pin is configurable, to allow maximum
flexibility to interface with other devices in this way.
Typical configurations of TDM operation between three devices are illustrated in Figure 57, Figure 58 and Figure 59.
CS47L85
Processor
CS47L85
or similar
CODEC
TXDAT
LRCLK
RXDAT
BCLK
TXDAT
LRCLK
RXDAT
BCLK
CS47L85
Processor
CS47L85
or similar
CODEC
TXDAT
LRCLK
RXDAT
BCLK
TXDAT
LRCLK
RXDAT
BCLK
Figure 57 TDM with CS47L85 as Master
Figure 58 TDM with Other CODEC as Master



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