WM9713 datasheet(25/111 Pages) WOLFSON

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Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

LEFT CHANNEL

RIGHT CHANNEL

PCMFS

PCMCLK

PCMADC/

PCMDAC

n-2 n-1

LSB

MSB

n-2 n-1

1 BCLK / VXCLK

Input Word Length (WL)

1/fs

Figure 7 DSP Mode Audio Interface (mode A, FSP=0)

LEFT CHANNEL

RIGHT CHANNEL

PCMFS

PCMCLK

PCMADC/

PCMDAC

n-2 n-1

LSB

MSB

n-2 n-1

1 BCLK / VXCLK

Input Word Length (WL)

1/fs

Figure 7 DSP Mode Audio Interface (mode B, FSP=1)

In Left Justified mode, the MSB is available on the first rising edge of PCMCLK following a PCMFS

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

PCMCLK frequency and sample rate, there may be unused PCMCLK cycles before each PCMFS

transition.

LEFT CHANNEL

RIGHT CHANNEL

PCMFS

PCMCLK

PCMADC/

PCMDAC

1/fs

n-2 n-1

LSB

MSB

n-2 n-1

LSB

MSB

Figure 8 Left Justified Audio Interface (assuming n-bit word length)

In Right Justified mode, the LSB is available on the last rising edge of PCMCLK before a PCMFS

transition. All other bits are transmitted before (MSB first). Depending on word length, PCMCLK

frequency and sample rate, there may be unused PCMCLK cycles after each PCMFS transition.

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