WM8731CSEFL/R View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

WM8731CSEFL/R

Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates

Cirrus Logic 

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WM8731 / WM8731L

Production Data

1/fs

DACLRC/

ADCLRC

LEFT CHANNEL

RIGHT CHANNEL

BCLK

DACDAT/

ADCDAT

1 BCLK

123

MSB

n-2 n-1 n

LSB

1 BCLK

123

MSB

n-2 n-1 n

LSB

Figure 27 I2S Mode

Right Justified mode is where the LSB is available on the rising edge of BCLK preceding a DACLRC

or ADCLRC transition, yet MSB is still transmitted first.

DACLRC/

ADCLRC

BCLK

1/fs

LEFT CHANNEL

RIGHT CHANNEL

DACDAT/

ADCDAT

123

MSB

n-2 n-1 n

LSB

123

MSB

n-2 n-1 n

LSB

Figure 28 Right Justified Mode

In DSP/PCM mode, the left channel MSB is available on either the 1st (mode B) or 2nd (mode A) rising

edge of BCLK (selectable by LRP) following a rising edge of LRC. Right channel data immediately

follows left channel data. Depending on word length, BCLK frequency and sample rate, there may be

unused BCLK cycles between the LSB of the right channel data and the next sample.

Figure 29 DSP/PCM Mode Audio Interface (mode A, LRP=1)

w

PD, Rev 4.9, October 2012

37

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