XK-EVK-XU316 xcore.ai Evaluation Kit Manual

2.3 Microphone connector

Up to two PDM microphones can be connected to the xcore.ai evaluation kit. It uses a

header that connects to XMOS microphone boards. It is located near the bottom of the

board (J4), as shown in Figure 6, pinned out as follows:

Signal name

GPIO

Port

J4 Pin

VDDIOR

1

GND

2

MIC_CLK

X1D22

P1G

3

GND

4

MIC_DATA

X1D13

P1F

5

GND

6

There is a single microphone data line, for double data rate input. For example, a left

microphone shall provide data on the rising edge of the clock, the right microphone shall

provide data on the falling edge of the clock. If only one microphone is connected, one of

the edges can be ignored. Note that the microphone is supplied from VDDIOR, which is

3V3 on an unmodified board (see §4.3 for details on how to modify the IO voltages)

Figure 6:

Microphone

connector

2.4 Audio codec

The xcore.ai evaluation kit provides a stereo codec (TLV320AIC3204) on the bottom left

of the board, Figure 7. It is connected to the xcore.ai chip via I2C and I2S interfaces:

Figure 7:

CODEC

7