wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 122
wm8400
Manufacturer Part Number
wm8400
Description
Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8400.pdf
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Figure 71 I2S Justified Audio Interface (assuming n-bit word length)
In DSP mode, the left channel MSB is available on either the 1
edge of BCLK (selectable by AIF_LRCLK_INV) 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 72 and Figure
73. In device slave mode, Figure 74 and Figure 75, 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.
Figure 72 DSP Mode Audio Interface (mode A, AIF_LRCLK_INV=0, Master)
Figure 73 DSP Mode Audio Interface (mode B, AIF_LRCLK_INV=1, Master)
st
(mode B) or 2
PP, April 2009, Rev 3.0
nd
(mode A) rising
Pre-Production
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