WM9713 datasheet(24/111 Pages) WOLFSON

24 / 111 page

WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

The PCM Interface may be configured for Mono mode, where only one channel of ADC data is

output. In this mode the interface should be configured for DSP mode. A short or long frame sync is

supported and the MSB is available on either the 1st (mode B) or 2nd (mode A) rising edge of

VXCLK.

Note that when operating in stereo mode the mono Voice DAC always uses the left channel data as

its input.

PCMFS

PCMCLK

PCMADC/

PCMDAC

n-2 n-1

LSB

MSB

1 PCMCLK

Input Word Length (WL)

1/fs

Figure 5 PCM Interface Mono Mode (mode A, FSP=0)

PCMFS

PCMCLK

PCMADC/

PCMDAC

n-2 n-1

LSB

MSB

1 PCMCLK

Input Word Length (WL)

1/fs

Figure 6 PCM Interface Mono Mode (mode B, FSP=1)

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

edge of PCMCLK (selectable by FSP) following a rising edge of PCMFS. Right channel data

immediately follows left channel data. Depending on word length, PCMCLK frequency and sample

rate, there may be unused PCMCLK cycles between the LSB of the right channel data and the next

sample.

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