WM8959 datasheet(95/155 Pages) WOLFSON

95 / 155 page

Pre-Production

WM8959

PP, May 2008, Rev 3.1

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

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 before each DACLRC

transition.

Figure 64 Left Justified Audio Interface (assuming n-bit word length)

In I

2S mode, the MSB is available on the second rising edge of BCLK following a DACLRC 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 65 I2S Justified Audio Interface (assuming n-bit word length)

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

edge of BCLK (selectable by AIF_LRCLK_INV) following a rising edge of DACLRC. 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.

In device master mode, the LRC output will resemble the frame pulse shown in Figure 66 and Figure

67. In device slave mode, Figure 68 and Figure 69, it is possible to use any length of frame pulse

less than 1/fs, providing the falling edge of the frame pulse occurs greater than one BCLK period

before the rising edge of the next frame pulse.

WM8959 Datasheet(PDF) 95 Page - Wolfson Microelectronics plc