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WM8281ECS/R 数据表(PDF) 146 Page - Cirrus Logic |
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WM8281ECS/R 数据表(HTML) 146 Page - Cirrus Logic |
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146 / 392 page  WM8281 146 Rev 4.0 Figure 52 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 52 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 43 or Figure 44. 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 53, Figure 54 and Figure 55. The WM8281 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 53, Figure 54 and Figure 55. WM8281 Processor WM8281 or similar CODEC TXDAT LRCLK RXDAT BCLK TXDAT LRCLK RXDAT BCLK WM8281 Processor WM8281 or similar CODEC TXDAT LRCLK RXDAT BCLK TXDAT LRCLK RXDAT BCLK Figure 53 TDM with WM8281 as Master Figure 54 TDM with Other CODEC as Master |
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