参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 66/143页
文件大小: 0K
描述: KIT STARTER W/SPARTAN-3A
产品培训模块: FPGAs Spartan3
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3A
类型: FPGA
适用于相关产品: Spartan?3A FPGA,XC3S700A-FG484
所含物品: 板,线缆,文档,电源
相关产品: XC3S700A-5FTG256C-ND - IC FPGA SPARTAN-3A 256K 256FTBGA
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XC3S700A-5FG484C-ND - IC SPARTAN-3A FPGA 700K 484FBGA
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其它名称: 122-1514
Chapter 7: RS-232 Serial Ports
R
Figure 7-1 shows the connection between the FPGA and the two DB9 connectors. The
FPGA supplies serial output data using LVTTL or LVCMOS levels to the Maxim device,
which in turn, converts the logic value to the appropriate RS-232 voltage level. Likewise,
the Maxim device converts the RS-232 serial input data to LVTTL levels for the FPGA. A
series resistor between the Maxim output pin and the FPGA’s RXD pin protects against
inadvertent logic conflicts such as accidentally connecting the board using a null-modem
cable. In this example, both the FPGA and the extneral serial device will both be driving
data on the transmit line.
Hardware flow control is not supported on the connector. The port’s DCD, DTR, and DSR
signals connect together, as shown in Figure 7-1 . Similarly, the port’s RTS and CTS signals
connect together.
UCF Location Constraints
Figure 7-2 and Figure 7-3 provide the UCF constraints for the DTE and DCE RS-232 ports,
respectively, including the I/O pin assignment and the I/O standard used.
NET "RS232_DTE_RXD" LOC = "F16" | IOSTANDARD = LVTTL ;
NET "RS232_DTE_TXD" LOC = "E15" | IOSTANDARD = LVTTL | DRIVE = 4 | SLEW = SLOW ;
Figure 7-2: UCF Location Constraints for DTE RS-232 Serial Port
NET "RS232_DCE_RXD" LOC = "E16" | IOSTANDARD = LVTTL ;
NET "RS232_DCE_TXD" LOC = "F15" | IOSTANDARD = LVTTL | DRIVE = 4 | SLEW = SLOW ;
Figure 7-3:
UCF Location Constraints for DCE RS-232 Serial Port
66
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
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