PCM1795DB datasheet(50/58 Pages) TI

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Extended Command Field

ExtendedCommand

RSVD

EMD

DCS

R/W

DeviceID

RegisterID

Data

NotUsed

Audio Fields

AudioData

MSB

24Bits

LSB

All0s

4 3

TDMCA Register Requirements

BCK

DOEN

(Internal)

1BCKEarly

Read ModeandProperRegisterID

WriteDataRetrieved,ifWriteMode

ReadDataDriven,ifReadMode

RegisterIDPhase

DataPhase

PCM1795

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

The extended command field is the same as the command field, except that it does not have a DID flag.

Figure 68 defines the extended command field.

Figure 68. Extended Command Field

The audio field is 32 bits in length and the audio data are transferred MSB first, so the other fields must be filled

with 0s as shown in Figure 69.

Figure 69. Audio Field Example

The TDMCA mode requires device ID and audio channel information, as previously described. The OPE bit in

the TDMCA mode; see the mode control register map of Table 9.

The command supports register write and read operations. If the command requests to read one register, the

read data are transferred on DO during the data phase of the timing cycle. The DI signal can be retrieved at the

positive edge of BCK, and the DO signal is driven at the negative edge of BCK. DO is activated one BCK cycle

early to compensate for the output delay caused by high impedance. Figure 70 shows the TDMCA write and

read timing.

Figure 70. TDMCA Write and Read Operation Timing

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