
Spartan-3E FPGA Starter Kit Board User Guide www.xilinx.com 61
UG230 (v1.2) January 20, 2011
Chapter 7
RS-232 Serial Ports
Overview
As shown in Figure 7-1, the Spartan
®
-3E FPGA Starter Kit board has two RS-232 serial
ports: a female DB9 DCE connector and a male DTE connector. The DCE-style port
connects directly to the serial port connector available on most personal computers and
workstations via a standard straight-through serial cable. Null modem, gender changers,
or crossover cables are not required. Use the DTE-style connector to control other RS-232
peripherals, such as modems or printers, or perform simple loopback testing with the DCE
connector. Note that Figure 7-1 shows the view looking “out” the DTE connector.
Figure 7-1: RS-232 Serial Ports
DCE
DTE
Spartan-3E FPGA
DTE
Male DB9
12345
6789
GND
12345
6789
GND
RS232_DCE_RXD
RS232_DCE_TXD
RS232_DTE_TXD
RS232_DTE_RXD
DCE
Female DB9
RS-232 Voltage Translator (IC2)
J9 J10
(M13)
(U8)(M14)(R7)
Pin 1
Pin 6
Pin 9
Pin 5
DB9 Serial Port Connector
(front view)
Standard
9-pin serial cable
Standard
9-pin serial cable
RS CS TR RD TD CD
TALK/DATA
TALK
RS-232 Peripheral
UG230_c7_01_062008
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