Digi NS9210 User Manual
Page 48
48
NS9210 Processor Module Hardware Reference
C h a p t e r 2
Serial port C TTL
interface
The serial (UART) port C interface is a TTL interface connected to a 2x5 pin, 0.1”
connector, X5. The connector supports only TTL level.
The serial port C interface corresponds to the NS9215 UART port C. The signals are
shared with the
HDLC
interface.
Serial port C pins are allocated as shown:
Note: By using GPIO12 as RIC#, be sure to populate a series resistor on the
baseboard. This is necessary to avoid conflict between the default configuration of
the GPIO when booting (RESET_DONE / output) and the chosen configuration once
booted (RIC# / input).
By default, Serial C signals are configured to their respective GPIO signals, except
for GPIO12. It is the responsibility of the driver to configure them properly.
Pin
Function
Defaults to
1
DCDC#/TXCLKC
GPIO8.
2
DSRC#
GPIO10.
3
RXDC#
GPIO11
4
RTSC#/RXCLKC
GPIO13
5
TXDC
GPIO15
6
CTSC#
GPIO9
7
DTRC#/TXCLKC
GPIO14
8
RIC#/RXCLKC/GPIO 12
RESET_DONE See note
9
GND
10
3.3V