import hdl coder fails, why?

I have the code below in verilog that implements cordic algorithm

`timescale 10 ns / 10 ns

module cordic_test
          (
           clk,
           x,
           y,
		   rst,
          enable,
           angle
          );

input clk,rst,enable;
input [15:0] x,y;
output reg [15:0] angle;
reg signed [15:0] r,s,rnew,snew;
reg [4:0] i;
wire[0:15] tanLUT_fixed={16'h4000,16'h25c8,16'h13F6,16'hA22,16'h0516,16'h028B,16'h0145,16'h00A2,16'h51,16'h29,16'h14,16'hA,16'h5,16'h3,16'h2,16'h1};


always@(posedge clk)
if (!rst)
begin
rnew<=0;
snew<=0;
end
else if (enable==1)
begin
r<=x;
s<=y;
end
else begin
for(i=0;i<=15;i=i+1)
begin
if(s>0) // CW  // Error: Multiple assignments on signal 'r' is not supported. 
//Hdl Import parse failed. 
begin
rnew<=r+(s>>i);
snew<=(s-(r>>i));
r<=rnew;
s<=snew;
angle<=(angle+tanLUT_fixed[i]);
end
else //CCW
begin
rnew<=(r-(s>>i));
snew<=(s+(r>>i));
r<=rnew;
s<=snew;
angle<=(angle-tanLUT_fixed[i]);
end
end
end
endmodule

. While importing through hdl coder, I get the error mesage "Multiple assignments on signal 'r' is not supported. Hdl Import parse failed. ". What could be wrong. Synthesizes well.

Answer 1

[Kiran Kintali]

This is a limitaiton of importhdl feature. In general only subset of verilog is convertible to Simulink using this feature.

[Gary]

What corrections need to be done in the code?

[Kiran Kintali]

What version of MATLAB are you using?

There is 128bit limitation for the import capability.

wire[0:15] tanLUT_fixed={16'h4000,16'h25c8,16'h13F6,16'hA22,16'h0516,16'h028B,16'h0145,16'h00A2,16'h51,16'h29,16'h14,16'hA,16'h5,16'h3,16'h2,16'h1};