adder4.ucf

这是个基于 Xilinx Spartan3 的加法器

#PACE: Start of Constraints generated by PACE

#PACE: Start of PACE I/O Pin Assignments
NET "cin"  LOC = "LB"  ;
NET "cout"  LOC = "LB"  ;
NET "ina<0>"  LOC = "BANK1" | IOSTANDARD = LVTTL ;
NET "ina<1>"  LOC = "BANK1" | IOSTANDARD = LVTTL ;
NET "ina<2>"  LOC = "BANK1" | IOSTANDARD = LVTTL ;
NET "ina<3>"  LOC = "BANK1" | IOSTANDARD = LVTTL ;
NET "inb<0>"  LOC = "BANK2" | IOSTANDARD = LVTTL ;
NET "inb<1>"  LOC = "BANK2" | IOSTANDARD = LVTTL ;
NET "inb<2>"  LOC = "BANK2" | IOSTANDARD = LVTTL ;
NET "inb<3>"  LOC = "BANK2" | IOSTANDARD = LVTTL ;
NET "sum<0>"  LOC = "BANK0" | IOSTANDARD = LVTTL ;
NET "sum<1>"  LOC = "BANK0" | IOSTANDARD = LVTTL ;
NET "sum<2>"  LOC = "BANK0" | IOSTANDARD = LVTTL ;
NET "sum<3>"  LOC = "BANK0" | IOSTANDARD = LVTTL ;

#PACE: Start of PACE Area Constraints

#PACE: Start of PACE Prohibit Constraints

#PACE: End of Constraints generated by PACE