WM8756 datasheet(14/39 Pages) WOLFSON

14 / 39 page

WM8756

Advance Information

AI Rev 1.3 October 2001

minimum of word length BCKINs. Any mark to space ratio on LRCIN is acceptable provided the above

requirements are met. The WM8756 will automatically detect when data with a LRCIN period of exactly 32

is sent, and select 16 bit mode - overriding any previously programmed word length. Word length will

revert to the previously programmed value if a LRCIN period other than 32 is detected.

In DSP early or DSP late mode, all 6 channels are time multiplexed onto DIN0. LRCIN is used as a frame

sync signal to identify the MSB of the first word. The minimum number of BCKINs per LRCIN period is 6

times the selected word length. Any mark to space ratio is acceptable on LRCIN provided the rising edge

is correctly positioned (see Figures 9 and 10).

LEFT JUSTIFIED MODE

In left justified mode, the MSB is sampled on the first rising edge of BCKIN following a LRCIN transition.

LRCIN is high during the left samples and low during the right samples.

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN0/1/2

1/fs

n-2 n-1

LSB

MSB

n-2 n-1

LSB

MSB

Figure 6 Left Justified Mode Timing Diagram

RIGHT JUSTIFIED MODE

In right justified mode, the LSB is sampled on the rising edge of BCKIN preceding a LRCIN transition.

LRCIN is high during the left samples and low during the right samples.

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN0/1/2

1/fs

n-2 n-1

LSB

MSB

n-2 n-1

LSB

MSB

Figure 7 Right Justified Mode Timing Diagram

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