Kontron SMARC-sA3874i - Manual (Page 38)

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User’s Guide
3.2.20 SPDIF Interface
The ULP-COM sA3874i module supports one SPDIF interface.
SPDIF interface signals are exposed on the ULP-COM sA3874i edge connector as shown below:
ULP-COM sA3874i Edge finger TI Cortex A8 CPU Net Name Notes
Pin # Pin Name Pin # Pin Name
S59 SPDIF_OUT R3 MCA[1]_AXR[2]/MCB_FSR SPDIF_OUT Digital Audio Output
S60 SPDIF_IN SPDIF_IN Digital Audio Input
3.2.21 Asynchronous Serial Ports
The ULP-COM sA3874i module supports four UARTs (SER0:3). UARTs SER0 and SER2 supports flow control signals
(RTS, CTS). UARTs SER1 and SER3 do not support flow control.
The sA3874i asynchronous serial port signals have a 1.8V level signal swing. They can be converted to RS232 level
and polarity signals by using a suitable RS232 transceiver. There are transceivers available that accept a 1.8V
signal level: some examples include the Texas Instruments TRS3253E, the Maxim MAX3218 and the Linear
Technology LTC2801. Note that RS232 transceivers invert the signal; a logic ‘1’ is a negative voltage (-3.0V to -
15V) and a logic ‘0’ a positive voltage (3.0V to 15V) on the RS232 line.