PCM1796DB datasheet(49/63 Pages) TI2

49 / 63 page

PCM1796

SLES100A − DECEMBER 2003 − REVISED NOVEMBER 2006

www.ti.com

58 BCKs

Command Field

DID

LRCK

BCK

DCO1

DCI2

Device ID = 1

Device ID = 2

DCO1

DCO2

DCI3

DCO29

DCI30

Device ID = 3

Device ID = 30

•

Figure 56. Device ID Determination Sequence

TDMCA Frame

In general, the TDMCA frame consists of the command field, extended command (EMD) field, and audio data fields.

All of them are 32 bits in length, 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 follows 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 PCM1796 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 57 shows the general TDMCA frame. If some DACs

are enabled, but corresponding audio data packets are not transferred, the analog outputs are unpredictable.

LRCK

BCK

CMD

EMD

CMD

Don’t

Care

EMD

Ch1

Ch(m)

Ch2

CMD

Ch2

Ch3

Ch(n)

CMD

Ch1

Ch4

Ch3

Ch4

[For Initialization]

[For Operation]

32 Bits

CMD

1/fS

Don’t

Care

Figure 57. General TDMCA Frame

PCM1796DB Datasheet(PDF) 49 Page - Texas Instruments

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