Embedian SMARC-iMX8M Series, User Manual, Page: 77 / 174

Embedian, Inc.
77
SMARC-iMX8M Computer on Module User’s Manual v.1.0
2.1.15.1. UART Signals
Module pins for up to four asynchronous serial ports are defined. The
ports are designated
SER0 – SER3 . Ports SER0 and SER2 are 4 wire ports (2
data lines and 2 handshake lines). Ports SER1 and SER3 are 2 wire ports
(data only).
Edge Golden
Finder
Signal Name
Direction Type
Tolerance
Description
SER[0:3]_TX Output CMOS
1.8V Asynchronous serial port data out
SER[0:3]_RX Input CMOS
1.8V Asynchronous serial port data in
SER[0]_RTS# Output CMOS
1.8V Request to Send handshake line for SER0
SER[0]_CTS# Input CMOS
1.8V Clear to Send handshake line for SER0
SER[2]_RTS# Output CMOS
1.8V Request to Send handshake line for SER2
SER[2]_CTS# Input CMOS
1.8V Clear to Send handshake line for SER2