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PCM1795DBRG4.B Datasheet(PDF) 52 Page - Texas Instruments |
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PCM1795DBRG4.B Datasheet(HTML) 52 Page - Texas Instruments |
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52 / 68 page  LRCK BCK DI CMD EMD EMD EMD CMD Don’t Care EMD EMD DO Ch1 Ch(m) Ch2 CMD CMD Ch2 Ch3 Ch(n) CMD Ch1 Ch4 DI Ch3 Ch4 [ForInitialization] [ForOperation] 32Bits DO CMD CMD CMD CMD CMD CMD 1/f S Don’t Care 58BCKs CommandField DID LRCK BCK DI DCO1, DCI2 DeviceID=1 DeviceID=2 DCO1 DCO2, DCI3 DCO29, DCI30 DeviceID=3 DeviceID=30 PCM1795 SLES248A – MAY 2009 – REVISED MARCH 2015 www.ti.com Figure 72. Device ID Determination Sequence 8.2.4.2.4 TDMCA Frame In general, the TDMCA frame consists of the command field, extended command (EMD) field, and audio data fields. All fields are 32 bits long, but the lowest byte has no meaning. The MSB is transferred first for each field. The command field is always transferred as the first packet of the frame. The EMD field is transferred if the EMD flag of the command field is high. If any EMD packets are transferred, no audio data follow the EMD packets. This frame is for quick system initialization. All devices of a daisy-chain should respond to the command field and extended command field. The PCM1795 has two audio channels that can be selected by OPE (register 19). If the OPE bit is not set to high, those audio channels are transferred. Figure 73 shows the general TDMCA frame. If some DACs are enabled, but corresponding audio data packets are not transferred, the analog outputs are unpredictable. Figure 73. General TDMCA Frame 52 Submit Documentation Feedback Copyright © 2009–2015, Texas Instruments Incorporated Product Folder Links: PCM1795 |
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