原创 加法器流水线和分流水线 的实现代码

// 加法器的分流水线实现
module adder8(cout,sum,clk,cina,cinb,cin);
     input  [7:0] cina,cinb;
     input  clk,cin;
  output [7:0] sum;
  output cout;
 
  reg cout;
  reg [7:0] sum;
 
  always @( cina or cinb or cin )
     begin
       {cout,sum}=cina+cinb+cin;
        end
endmodule  

//二级流水线 加法器的流水线实现
module adder8_2(cout,sum,clk,cina,cinb,cin);
     input  [7:0] cina,cinb;
     input  clk,cin;
  output [7:0] sum;
  output cout;
 
  reg cout;
  reg cout1;
  reg [3:0] sum1;
  reg [7:0] sum;
 
 always @( posedge clk )
     begin
       {cout1,sum1}=cina[3:0]+cinb[3:0]+cin;
        end
 always @( posedge clk )
        begin
    {cout,sum}={ {cina[7],cin[7:4]}+{cinb[7],cinb[7:4]+cout1},sum1 };
        end  
endmodule 
 
//四级流水线 加法器的流水线实现
module adder8_4(cout,sum,clk,cina,cinb,cin);
     input  [7:0] cina,cinb;
     input  clk,cin;
  output [7:0] sum;
  output cout;
 
  reg cout;
  reg cout1,cout2,cout3;
  reg [2:0] sum1;
  reg [4:0] sum2;
  reg [6:0] sum3;
  reg [7:0] sum;
 
 always @( posedge clk )
     begin
       {cout1,sum1}=cina[1:0]+cinb[1:0]+cin;
        end
 always @( posedge clk )
        begin
    {cout2,sum2}={ {cina[3],cin[3:2]}+{cinb[3],cinb[3:3]+cout1},sum1 };
        end 
 always @( posedge clk )
        begin
    {cout3,sum3}={ {cina[5],cin[5:4]}+{cinb[5],cinb[5:4]+cout2},sum2 };
        end 
 always @( posedge clk )
        begin
    {cout,sum}={ {cina[7],cin[7:6]}+{cinb[7],cinb[7:6]+cout3},sum3 };
        end   
endmodule