EMTRION emCON-MX8MM, Руководство по оборудованию

Страница: 12 / 33

emCON-MX8MM - Hardware Manual (Rev1) 12/33
4.10 Audio - SPDIF
The emCON-MX8MM also supports audio data in SPDIF format. The SPDIF_OUT signal at the
emCON connector has LVTTL level and will need to be configured externally, according to SPDIF
specification.
4.11 SD-Card Interface
The i.MX8MM includes three SD Card interfaces to drive memory- or I/O cards. One of them
(uSDHC2) is used for the 4-bit SD Card interface of the emCON connector. uSDHC2 is used for the
interface SDC1. The SDC2 interface on the emCON connector is not connected.
The card ’s detect and write protect signals can be controlled either by the SD card controller or by
the GPIO ports of the i.MX8MM:
Signal Description GPIO emCON SDC port
SDC2_CD# Low-active card detection signal GPIO2_IO12 SDC1_CD#
SDC2_WP high-active write protection signal GPIO2_IO20 SDC1_WP
4.12 Serial Ports
The emCON-MX8MM has four serial ports. All serial ports are integrated in the processor i.MX8MM
and available as LVTTL level. External transceivers are necessary to use interfaces like RS232 or
RS485.
An overview of the UART interfaces is shown in the following table:
i.MX8MM interface emCON name Handshake Signals
UART1 UART_A -
UART2 UART_B RTS, CTS
UART3 UART_C -
UART4 UART_D -
UART1 is used as a standard debug and communication interface (TERMINAL).
4.12.1 IrDA
Each processor UART port can also be used as a low speed (115200bps) Infrared port (IrDA). The
UART RXD input signal is also the IrDA RXD input signal. The UART TXD output signal is the IrDA
TXD output signal.
4.13 I²C- Bus
There are three I²C bus interfaces available on the emCON-MX8MM module.
The I²C interface (I2C3) is only routed on the emCON-MX8MM module and all onboard I²C devices
on the module are connected to that interface. The interface works with a transmission speed of up
to 400 kb/s. The interface operates as a master.