xcore.ai Multichannel Audio Board 1v1 Hardware Manual
Mode Shorting Jumper Position
J6 J9 J11 J13
I2S 2-3 2-3 2-3 2-3
TDM input on X_ADC_D0 1-2, 3-4 NO FIT 1-2 NO FIT
TDM input on X_ADC_D1 1-2 3-4 1-2 NO FIT
TDM input on X_ADC_D2 1-2 NO FIT 1-2, 3-4 NO FIT
TDM input on X_ADC_D3 1-2 NO FIT 1-2 3-4
Figure 5:
Analog input
configuration
Pin 1 of each jumper is denoted by a triangle on the silkscreen.
The ADC registers are accessed via the I2C bus - see §14.
Board Net xCORE GPIO Port Description
X_ADC_D0 X1D24 P1I0 Serial data input 0 (I2S or TDM)
X_ADC_D1 X1D25 P1J0 Serial data input 1 (I2S or TDM)
X_ADC_D2 X1D34 P1K0 Serial data input 2 (I2S or TDM)
X_ADC_D3 X1D35 P1L0 Serial data input 3 (I2S or TDM)
ADC_GPIO X0D33 P4E3 Multipurpose interrupt input
LRCK X1D01 P1B0 Serial left/right frame clock
BCLK X1D10 P1C0 Bit clock for serial data transfer
MCLK_ADC See note NA Buffered global audio master clock
Figure 6:
Analog input
xCORE GPIO
Notes:
·Details of the audio clocking scheme can be found in §11.
7 Analog audio output
A total of eight single-ended analog output channels are provided via four 3.5mm stereo
jacks. The 8 analog outputs are generated by four 2 channel DACs (PCM5122). The DACs
are configured to accept digital audio over I2S or TDM. Configuration of the DACs is via
I2C. The full scale output level is 2.1Vrms.
The four digital input channels ADC_D0 to ADC_D3 are mapped to the xCORE outputs
X_DAC_D0 to X_DAC_D3 through a header array as described in Figure 8. Basic jumper
operation allows configuring the device to work in I2S or TDM mode. In I2S mode, each
wire carries 2 channels of audio so the 8 analog output channels map 1:1 to the four digital
outputs. In TDM mode, a single wire can carry up to 8 channels of data. This means the
four xCORE digital outputs can support up to 32 analog output channels. The jumpers
7
