cehngfa.txt

实现乘法功能

module Booth_2(X,Y, P,Y1,CR,CP);
    input [3:0] X,Y;
    output [3:0] P,Y1;
    input CR,CP;
	
	 reg [3:0]regX;
    reg Yo;	 
	 reg [3:0]Y1;
    reg [4:0]RX,FX;
    reg P1;
    reg [3:0]P;
    reg [3:0]count; 
   

	always@(posedge CP,negedge CR)	  
	begin  
	 if(~CR)
	 begin 
	    RX={X[3],X};
		 regX=~X+1;
		 FX={regX[3],regX};
		 Y1=Y;
		 Yo=0;
		 P=0;
		 P1=0;
		 count=0;
	 end
    else 
	  if((({Y1[0],Yo}==2'b00)||({Y1[0],Yo}==2'b11))&&(count<=3))
     begin
      {P1,P,Y1,Yo}={P1,P1,P,Y1};
		count=count+1;
     end
     else if(({Y1[0],Yo}==2'b01)&&(count<=3))
     begin
	  {P1,P}={P1,P}+RX;
     {P1,P,Y1,Yo}={P1,P1,P,Y1};
	  count=count+1;
     end
     else if(({Y1[0],Yo}==2'b10)&&(count<=3))
	  begin
     {P1,P}={P1,P}+FX;
     {P1,P,Y1,Yo}={P1,P1,P,Y1};
	  count=count+1;
     end
   end
	  

endmodule