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14 Interfaces

3.12 Serial (UART)

The LEC-iMX6 provides four serial interfaces: Two ports are high-speed, 4-wire ports (with TX/

RX and RTS#/CTS#), and two ports are 2-wire (with TX/RX only.) Refer to the following table.

The voltage levels of the UART interfaces are 1.8V.

3.13 SPDIF

The Sony/Philips Digital Interconnect Format (SPDIF) audio block is a stereo transceiver that

allows the processor to receive and transmit digital audio. Since the SPDIF internal data width is

24-bit, the eight most-significant bits of all registers return zeros. The SPDIF uses 2 wires, one

data output, and one input.

The voltage level of the SPDIF interface is 1.8V

3.14 I2S

The LEC-iMX6 provides one I2S audio interface, and the signals are brought out through the

I2S0 pins on the SMARC connector. The signals are shared with the SPI0 interface on the

SMARC connector. The signal that allows switching between SPI and I2S is GPIO1_IO3. The

default state is SPI (GPIO1_IO3 = low). When GPIO1_IO3 = high, I2S is switched through the

SMARC connector.

The voltage level of the I2S interface is 1.8V

3.15 CAN

The LEC-iMX6 provides two CAN (FLEXCAN) interfaces that comply with the CAN 2.0B proto-

col specification. Two CAN bus transceivers reside on the CPU and are not required on the

module. Refer to the following table for signal designators.

The voltage level of the CAN interface is 1.8V

3.16 SD/SDIO Interface

Four parallel data lines comprise the SD/SDIO interface, supporting SD Card sockets. The

LEC-iMX6 provides a 4-bit transfer mode at the SMARC connector using the SDIO pins and the

SD2 interface of the i.MX 6 CPU. The following modes can be selected for data transfer:

 SD/SDIO full speed mode (up to 25 MHz)

 SD/SDIO high speed mode (up to 50 MHz)

 SD/SDIO UHS-I mode (up to 208 MHz in SDR mode, up to 50 Mhz in DDR mode)

The SDIO interface can be selected as the Boot Device. The voltage level of the SD/SDIO inter-

face is 3.3V

i.MX6 SMARC connector Bus width

UART1 SER0 4 wire bus

UART2 SER1 2 wire bus

UART5 SER2 4 wire bus

UART4 SER3 2 wire bus

i.MX6 SMARC connector

FLEXCAN1 CAN0

FLEXCAN2 CAN1

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