Digilent 410-087P-KIT - Manual (Page 59)

Spartan-3E Starter Kit Board User Guide www.xilinx.com 59
UG230 (v1.0) March 9, 2006
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Chapter 7
RS-232 Serial Ports
Overview
As shown in Figure 7-1 , the Spartan-3E 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.
Figure 7-1: RS-232 Serial Ports
DCE DTE
Spartan-3E FPGA
DTE
Male DB9
1 2 3 4 5
6 7 8 9
GND
1 2 3 4 5
6 7 8 9
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_022006