wm8987 Wolfson Microelectronics plc, wm8987 Datasheet - Page 37

• Manufacturer Part Number: wm8987
• Description: Stereo Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Production Data
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AUDIO DATA FORMATS
In Left Justified mode, the MSB is available on the first rising edge of BCLK following a LRCLK
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 LRCLK transition.
Figure 13 Left Justified Audio Interface (assuming n-bit word length)
In I
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 14 I
In DSP/PCM mode, the left channel MSB is available on either the 1
rising edge of BCLK (selectable by LRP) following a rising edge of LRC. 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 15 and Figure
16. In device slave mode, Figure 17 and Figure 18, 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.
2
S mode, the MSB is available on the second rising edge of BCLK following a LRCLK transition.
2
S Justified Audio Interface (assuming n-bit word length)
st
(mode B) or 2
PD Rev 4.0 August 2008
WM8987L
nd
(mode A)
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