PCM1795DB datasheet(51/58 Pages) TI

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TDMCA Mode Operation

9Packets ´ 32Bits

LRCK

BCK

Don’tCare

DCI1

DCO1

DID=1

DCI2

DCO2

DID=2

DCI3

DCO3

DID=3

DCI4

DCO4

DID=4

CMD

1/f

S (384BCKClocks)

CMD

Ch1

Ch2

Ch3

Ch4

Ch5

Ch6

Ch7

Ch8

INDaisyChain

14 BCKDelay

2BCKDelay

DID=1

DID=2

DID=8

Don’tCare

CMD

Ch2

Ch15

5Packets

32Bits

1/f (256BCKClocks)

DCI

DCO

Ch1

Ch16

DCI

DCO

DCI

LRCK

BCK

PCM1795

www.ti.com ........................................................................................................................................................................................................ SLES248 – MAY 2009

DCO specifies the owner of the next audio channel in TDMCA mode operation. When a device retrieves its own

audio channel data, DCO goes high during the last audio channel period. Figure 71 shows the DCO output

timing in TDMCA mode operation. The host controller ignores the behavior of DCI and DCO. DCO indicates the

last audio channel of each device. Therefore, DCI means the next audio channel is allocated.

If some devices are skipped because of no active audio channel, the skipped devices must notify the next device

that the DCO will be passed through the next DCI. Figure 72 and Figure 73 show DCO timing with skip

operation. Figure 74 and Table 16 show the ac timing of the daisy-chain signals.

Figure 71. DCO Output Timing of TDMCA Mode Operation

Figure 72. DCO Output Timing with Skip Operation

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