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module cordic(clk, z0, xn, yn);

input clk;

input [10:0] z0;

output [16:0] xn, yn;

parameter N= 10; // number of iterations

reg [(N-1):0] d;

reg [16:0] x [N:0];

reg [16:0] y [N:0];

reg [10:0] z [N:0];

reg [10:0] arctan [(N-1):0];

initial begin

x[0] = 'b0_10011_0110_1110_1001; // 0.60725 in binary

y[0] = 0;

z[0] = z0;

arctan[0] = 'b010_1101_0000; // 45.0;

arctan[1] = 'b001_1010_1001; // 26.6;

arctan[2] = 'b000_1110_0000; // 14.0;

arctan[3] = 'b000_0111_0001; // 7.1;

arctan[4] = 'b000_0011_1001; // 3.6;

arctan[5] = 'b000_0001_1100; // 1.8;

arctan[6] = 'b000_0000_1110; // 0.9;

arctan[7] = 'b000_0000_0110; // 0.4;

arctan[8] = 'b000_0000_0011; // 0.2;

arctan[9] = 'b000_0000_0001; // 0.1;

end

integer i;

always @(posedge clk)

begin z[0] = z0;

begin

for(i=0; i<N; i=i+1)

begin

d[i] = (z[i][10] == 0) ? 0 : 1;

if(d[i] == 0) begin

x[i+1] = x[i] - (y[i] >> i);

y[i+1] = y[i] + (x[i] >> i);

z[i+1] = z[i] - arctan[i];

end

else begin

x[i+1] = x[i] + (y[i] >> i);

y[i+1] = y[i] - (x[i] >> i);

z[i+1] = z[i] + arctan[i];

end

$display("i=%2d, x[i]=%b, y[i]=%b, z[i]=%b, d[i]=%2d, arctan[i]=%b", i,x[i],y[i],z[i],d[i],arctan[i]);

end

assign xn = x[N]; // xn = cos(z0)

assign yn = y[N]; // yn = sin(z0)

endmodule

Saved diffs

Original text

Open file

module cordic(clk, z0, xn, yn);
  
  input clk;
  input [10:0] z0;
  output [16:0] xn, yn;

parameter N= 10; // number of iterations
  
  reg [(N-1):0] d;
  reg [16:0] x [N:0];
  reg [16:0] y [N:0];
  reg [10:0] z [N:0];
  reg [10:0] arctan [(N-1):0];

initial begin
    
    x[0] = 'b0_10011_0110_1110_1001;  // 0.60725 in binary
  	y[0] = 0;
	
    
    arctan[0] = 'b010_1101_0000; // 45.0;
    arctan[1] = 'b001_1010_1001; // 26.6;
    arctan[2] = 'b000_1110_0000; // 14.0;
    arctan[3] = 'b000_0111_0001; // 7.1;
    arctan[4] = 'b000_0011_1001; // 3.6;
    arctan[5] = 'b000_0001_1100; // 1.8;
    arctan[6] = 'b000_0000_1110; // 0.9;
    arctan[7] = 'b000_0000_0110; // 0.4;
    arctan[8] = 'b000_0000_0011; // 0.2;
    arctan[9] = 'b000_0000_0001; // 0.1;
  end

integer i;

always @(posedge clk)
    begin   	z[0] = z0;
      for(i=0; i<N; i=i+1)
      begin
        d[i] = (z[i][10] == 0) ? 0 : 1;

if(d[i] == 0) begin
          x[i+1] = x[i] - (y[i] >> i);
          y[i+1] = y[i] + (x[i] >> i);
          z[i+1] = z[i] - arctan[i];
        end
        
        else begin
          x[i+1] = x[i] + (y[i] >> i);
          y[i+1] = y[i] - (x[i] >> i);
          z[i+1] = z[i] + arctan[i];
        end
        
        $display("i=%2d, x[i]=%b, y[i]=%b, z[i]=%b, d[i]=%2d, arctan[i]=%b", i,x[i],y[i],z[i],d[i],arctan[i]);
      end
  end

assign xn = x[N]; // xn = cos(z0)
  assign yn = y[N]; // yn = sin(z0)

endmodule

Changed text

Open file

module cordic(clk, z0, xn, yn);
  
  input clk;
  input [10:0] z0;
  output [16:0] xn, yn;

parameter N= 10; // number of iterations
  
  reg [(N-1):0] d;
  reg [16:0] x [N:0];
  reg [16:0] y [N:0];
  reg [10:0] z [N:0];
  reg [10:0] arctan [(N-1):0];

initial begin
    
    x[0] = 'b0_10011_0110_1110_1001;  // 0.60725 in binary
  	y[0] = 0;
	z[0] = z0;
    
    arctan[0] = 'b010_1101_0000; // 45.0;
    arctan[1] = 'b001_1010_1001; // 26.6;
    arctan[2] = 'b000_1110_0000; // 14.0;
    arctan[3] = 'b000_0111_0001; // 7.1;
    arctan[4] = 'b000_0011_1001; // 3.6;
    arctan[5] = 'b000_0001_1100; // 1.8;
    arctan[6] = 'b000_0000_1110; // 0.9;
    arctan[7] = 'b000_0000_0110; // 0.4;
    arctan[8] = 'b000_0000_0011; // 0.2;
    arctan[9] = 'b000_0000_0001; // 0.1;
  end

integer i;

always @(posedge clk)
    begin   	
      for(i=0; i<N; i=i+1)
      begin
        d[i] = (z[i][10] == 0) ? 0 : 1;

assign xn = x[N]; // xn = cos(z0)
  assign yn = y[N]; // yn = sin(z0)

endmodule