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Board Net
MCLK_DIR
EXT_PLL_SEL
PLL_SYNC
MCLK_XMOS
MCLK_XMOS
Figure 17:
LRCK
Audio clocking
GPIO
BCLK
The Cirrus Logic CS2100 and Skyworks Si5351A-B-GT devices are controlled using I2C.
Further information on the xcore.ai Multichannel Audio Board I2C bus can be found in
§14.
15
xcore.ai Multichannel Audio Board 1v1 Hardware Manual
xCORE GPIO
Port
X0D43
P8D7
X0D42
P8D6
X0D00
P1A0
X1D11
P1D0
X0D11
P1D0
X1D01
P1B0
X1D10
P1C0
Description
Controls audio master clock direction. MCLK is an
input to xcore when low and an output when high.
Selects which external PLL to use. CS2100 when low,
Si5351A-B-GT when high.
Output to CS2100 frequency reference input.
Audio master clock. Input or output as specified by
MCLK_DIR and internal firmware config.
Audio master clock. Input only - for use by tile0
threads e.g. USB thread for clock sync.
Left/Right Frame clock. Input or output.
Serial bit clock. Input or output.
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