Pre Production
WM8941
Figure 33 Left Justified Audio Interface (assuming n-bit word length)
In Right Justified mode, the LSB is available on the last rising edge of BCLK before a FRAME
transition. All other bits are transmitted before (MSB first). Depending on word length, BCLK
frequency and sample rate, there may be unused BCLK cycles after each FRAME transition.
Figure 34 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.
Figure 35 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.
PP, Rev 3.3, December 2007
59
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
