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用VHDL编写的计算器：能实现简单的加减乘除四则运算

#PACE: Start of Constraints generated by PACE

#PACE: Start of PACE I/O Pin Assignments
NET "clk"  LOC = "p183"  ;
NET "com<0>"  LOC = "p130"  ;
NET "com<1>"  LOC = "p131"  ;
NET "com<2>"  LOC = "p133"  ;
NET "com<3>"  LOC = "p132"  ;
NET "cs"  LOC = "p135"  ;
NET "d<0>"  LOC = "p139"  ;
NET "d<1>"  LOC = "p140"  ;
NET "d<2>"  LOC = "p141"  ;
NET "d<3>"  LOC = "p143"  ;
NET "d<4>"  LOC = "p144"  ;
NET "d<5>"  LOC = "p146"  ;
NET "d<6>"  LOC = "p147"  ;
NET "d<7>"  LOC = "p148"  ;
NET "row<0>"  LOC = "p128"  ;
NET "row<1>"  LOC = "p126"  ;

#PACE: Start of PACE Area Constraints

#PACE: Start of PACE Prohibit Constraints

#PACE: End of Constraints generated by PACE