DSD1796DB.B datasheet(45/63 Pages) TI2

45 / 63 page

DSD1796

SLES101A – DECEMBER 2003 – REVISED NOVEMBER 2006

www.ti.com

58 BCKs

Command Field

DID

LRCK

BCK

DCO1

DCI2

DCO2

DCI3

DCO29

DCI30

Device ID = 1

Device ID = 2

Device ID = 3

Device ID = 30

DCO1

•

Figure 52. 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 DSD1796

has two audio channels that can be selected by OPE (register 19). If the OPE bit is not set HIGH, those audio channels

are transferred. Figure 53 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 53. General TDMCA Frame

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