Datasheet
Note: The SoC includes SAI3 lines, but most of these are used by the SoM for Wi-Fi, so you should not
remap these with your device tree.
The SoC also includes SAI5 lines but they are used as pin-strap for board identification purposes. Three of
them (SAI5_RXD1, SAI5_RXD3, and SAI5_RXFS) are pin-strapped inside the SoM, and their level is latched by
the U-Boot bootloader to determine the LPDDR4 memory size. We recommend that you do not use those
pins for any other purpose in your baseboard.
The other unused SAI3 and SAI5 signals are available as GPIO.
Sony/Philips audio (SPDIF)
Sony/Philips Digital Interface (SPDIF) is a standard audio file transfer format that supports Transmitter and Receiver
functionality. Refer to NXP iMX8M documentation for additional details.
Version 1.2 (August 2019)
Table 18. SAI 2 signals
Name Type Connector Pins Voltage Description
SAI2_TXD Output J1312 14 3.3V Transmit channel
SAI2_RXD Input J1312 20 3.3V Receive channel
SAI2_TXC Output J1312 18 3.3V Transmit bit clock
SAI2_TXFS Output J1312 16 3.3V Transmit frame sync
SAI2_MCLK I/O J1312 12 3.3V Audio master clock
SAI2_RXFS Input J1312 24 3.3V Receive frame sync
SAI2_RXC Input J1312 23 3.3V Receive bit clock
Table 19. SPDIF pin signals
Name Type Connector Pins Voltage Description
SPDIF_EXT_CLK Output J1311 92 3.3V External clock signal
SPDIF_TX Output J1311 96 3.3V Transmit data channel
SPDIF_RX Input J1311 98 3.3V Receive data channel
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