picoblaze_pwm_control.ucf

EDA原理及VHDL实现（何宾教授）

# Constraints for reference design 'picoblaze_pwm_control'.
#
# Revision C of the Spartan-3E Starter Kit.
#
# Ken Chapman - Xilinx Ltd - 22nd May 2006
#                          
# Period constraint for 50MHz operation
#
NET "clk" PERIOD = 20.0ns HIGH 50%;
#
# soldered 50MHz Clock.
# 
NET "clk" LOC = "C9" | IOSTANDARD = LVTTL;
#
#
# Simple LEDs 
# Require only 3.5mA. 
#
NET "led<0>" LOC = "F12" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<1>" LOC = "E12" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<2>" LOC = "E11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<3>" LOC = "F11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<4>" LOC = "C11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<5>" LOC = "D11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<6>" LOC = "E9"  | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "led<7>" LOC = "F9"  | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
#
#
# Simple I/O pins on connector J4
#
NET "simple<9>"  LOC = "D7" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 4;
NET "simple<10>" LOC = "C7" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 4;
NET "simple<11>" LOC = "F8" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 4;
NET "simple<12>" LOC = "E8" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 4;
#
#
# UART connections
#
NET "tx_female" LOC = "M14" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4;
NET "rx_female" LOC = "R7"  | IOSTANDARD = LVTTL;
#
#
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# End of File
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