SX-550 Evaluation Daughtercard
Hardware Configuration
silex Page 13
Part Number 40183-101
The two serial ports can be accessed with RS-232 signals, via the DB-9 connectors, or logic signals, via
the 10-pin headers.
The two logical serial port headers are located at JP2 and JP6. The serial ports provide four dedicated
signals and three optional signals. The optional signals are configured using jumpers. Table 5 details the
serial port signal descriptions.
Table 5 Logical Serial Port Signal Descriptions
Pin Signal Input/Output Pin Signal Input/Output
1 DCD Input
Enabled via header
2 DSR Input
Enabled via header
3 RXD Input 4 RTS Output
5 TXD Output 6 CTS Input
7 DTR Output
Enabled via header
8 No
Connect
9 GND 10 3.3V
All signals are 0 to 3.3 V logic signals.
To use header JP2, disable the RS-232 transceiver, U3, by placing a jumper on both JP8 pins.
To use header JP6, disable the RS-232 transceiver, U6, by placing a jumper on both JP9 pins.
Using the Optional Serial Signals
Signals GPIO 1 to 6 can be used as GPIO or Serial Port control signals DTR, DSR and DCD.
To configure signals DTR, DSR and DCD, place a jumper between JP4 and JP5 for that signal, as shown
in Figure 7.
DCD2
DTR1
DSR1
DCD1
DTR2
DSR2
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
JP3
JP4
JP5
Figure 7 Optional Serial Signals