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48 NS9210 Processor Module Hardware Reference
Chapter 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.
2DSRC# GPIO10.
3 RXDC# GPIO11
4 RTSC#/RXCLKC GPIO13
5 TXDC GPIO15
6CTSC# GPIO9
7 DTRC#/TXCLKC GPIO14
8 RIC#/RXCLKC/GPIO 12 RESET_DONE See note
9 GND
10 3.3V