WM8940CGEFLSLASHV datasheet(52/88 Pages) CIRRUS

52 / 88 page

WM8940

Rev 4.4

LEFT

PHASE

RIGHT

PHASE

FRAME

BCLK

DACDAT /

ADCDAT

1/fs

n-2 n-1

LSB

MSB

Figure 26 Right Justified Audio Interface (assuming n-bit word length)

In I2S mode, the MSB is available on the second rising edge of BCLK following a FRAME transition.

The other bits up to the LSB are then transmitted in order. Depending on word length, BCLK

frequency and sample rate, there may be unused BCLK cycles between the LSB of one sample and

the MSB of the next.

LEFT

PHASE

RIGHT

PHASE

FRAME

BCLK

DACDAT

/ADCDAT

1/fs

n-2 n-1

LSB

MSB

1 BCLK

Figure 27 I2S Audio Interface (assuming n-bit word length)

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

rising edge of BCLK (selectable by FRAMEP) following a rising edge of FRAME. 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.

FRAMEP should be set to 0 in this mode.

FRAME

BCLK

DACDAT /

ADCDAT

n-2 n-1

LSB

MSB

1 BCLK

Input Word Length (WL)

1/fs

Figure 28 DSP/PCM Mode Audio Interface (Mode A, FRAMEP=0)

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