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Chapter 2
Serial port B,
MEI interface,
X16
The serial (UART) port B connector X16 is a DSUB9 male connector. This
asynchronous serial port is DTE and requires a null modem cable to connect to a
computer serial port.
The serial port B MEI (multiple electrical interface) interface corresponds to
S3C2443 UART port B. The line drivers are configured using switch S6.
Note that all port B pins are allocated as shown:
Pin
1
2
3
4
5
6
7
8
9
RS232
function
RXD
TXD
GND
RTS#
CTS#
RS232
default
GPH3
GPH2
-
GPH11
GPH10
RS485
function
CTS-
RX+
TX+
RTS-
GND
RX-
RTS+
CTS+
TX-
RS485
default
n/a
GPH3
GPH2
n/a
-
n/a
GPIO11
GPH10
n/a
By default serial B signals are configured to their respective GPIO signals. It is the
responsibility of the driver to configure them properly.
Serial port C,
TTL interface,
X19
Pin
1
2
3
4
5
6
7
8
9
10
Function
NC
NC
RXD2
RTS2#/TXD3
TXD2
CTS2#/RXD3
NC
NC
GND
+3.3V
Defaults to
GPH5
GPH6
GPH4
GPH7
77
ConnectCore 9M 2443 & Wi-9M 2443 Hardware Reference
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