Datasheet
TDMCA Mode Operation
9Packets ´ 32Bits
LRCK
BCK
DI
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’tCareCMD CMDCh2 Ch15
5Packets 32Bits´
1/f (256BCKClocks)
S
DCI
DCO
DCO
DI
¼
¼
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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