import hdl coder fails, why?

2 次查看（过去 30 天）
Gary
Gary 2023-4-15
评论： Kiran Kintali 2023-4-17
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.

请先登录，再回答此问题。

回答（1 个）

Kiran Kintali
Kiran Kintali 2023-4-16
This is a limitaiton of importhdl feature. In general only subset of verilog is convertible to Simulink using this feature.
  2 个评论
Gary
Gary 2023-4-16
What corrections need to be done in the code?
Kiran Kintali
Kiran Kintali 2023-4-17
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};

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 HDL Coder 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by