Nate
/
BIM-Monitor


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132
							<!doctype html>

<title>CodeMirror: Verilog mode</title>
<meta charset="utf-8"/>
<link rel=stylesheet href="../../doc/docs.css">

<link rel="stylesheet" href="../../lib/codemirror.css">
<script src="../../lib/codemirror.js"></script>
<script src="verilog.js"></script>
<style>.CodeMirror {border: 2px inset #dee;}</style>
<div id=nav>
  <a href="http://codemirror.net"><img id=logo src="../../doc/logo.png"></a>

  <ul>
    <li><a href="../../index.html">Home</a>
    <li><a href="../../doc/manual.html">Manual</a>
    <li><a href="https://github.com/marijnh/codemirror">Code</a>
  </ul>
  <ul>
    <li><a href="../index.html">Language modes</a>
    <li><a class=active href="#">Verilog</a>
  </ul>
</div>

<article>
<h2>Verilog mode</h2>
<form><textarea id="code" name="code">
/* Verilog demo code */

module butterfly
  #(
    parameter WIDTH = 32,
    parameter MWIDTH = 1
    )
   (
    input wire                     clk,
    input wire                     rst_n,
    // m_in contains data that passes through this block with no change.
    input wire [MWIDTH-1:0]        m_in,
    // The twiddle factor.
    input wire signed [WIDTH-1:0]  w,
    // XA
    input wire signed [WIDTH-1:0]  xa,
    // XB
    input wire signed [WIDTH-1:0]  xb,
    // Set to 1 when new data is present on inputs.
    input wire                     x_nd,
    // delayed version of m_in.
    output reg [MWIDTH-1:0]        m_out,
    // YA = XA + W*XB
    // YB = XA - W*XB
    output wire signed [WIDTH-1:0] ya,
    output wire signed [WIDTH-1:0] yb,
    output reg                     y_nd,
    output reg                     error
    );

   // Set wire to the real and imag parts for convenience.
   wire signed [WIDTH/2-1:0]        xa_re;
   wire signed [WIDTH/2-1:0]        xa_im;
   assign xa_re = xa[WIDTH-1:WIDTH/2];
   assign xa_im = xa[WIDTH/2-1:0];
   wire signed [WIDTH/2-1: 0]       ya_re;
   wire signed [WIDTH/2-1: 0]       ya_im;
   assign ya = {ya_re, ya_im};
   wire signed [WIDTH/2-1: 0]       yb_re;
   wire signed [WIDTH/2-1: 0]       yb_im;
   assign yb = {yb_re, yb_im};

   // Delayed stuff.
   reg signed [WIDTH/2-1:0]         xa_re_z;
   reg signed [WIDTH/2-1:0]         xa_im_z;
   // Output of multiplier
   wire signed [WIDTH-1:0]          xbw;
   wire signed [WIDTH/2-1:0]        xbw_re;
   wire signed [WIDTH/2-1:0]        xbw_im;
   assign xbw_re = xbw[WIDTH-1:WIDTH/2];
   assign xbw_im = xbw[WIDTH/2-1:0];
   // Do summing
   // I don't think we should get overflow here because of the
   // size of the twiddle factors.
   // If we do testing should catch it.
   assign ya_re = xa_re_z + xbw_re;
   assign ya_im = xa_im_z + xbw_im;
   assign yb_re = xa_re_z - xbw_re;
   assign yb_im = xa_im_z - xbw_im;
   
   // Create the multiply module.
   multiply_complex #(WIDTH) multiply_complex_0
     (.clk(clk),
      .rst_n(rst_n),
      .x(xb),
      .y(w),
      .z(xbw)
      );

  always @ (posedge clk)
    begin
       if (!rst_n)
         begin
            y_nd <= 1'b0;
            error <= 1'b0;
         end
       else
         begin
            // Set delay for x_nd_old and m.
            y_nd <= x_nd;
            m_out <= m_in;
            if (x_nd)
              begin
                 xa_re_z <= xa_re/2;
                 xa_im_z <= xa_im/2;
              end
         end
    end
   
endmodule
</textarea></form>

    <script>
      var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
        lineNumbers: true,
        mode: "text/x-verilog"
      });
    </script>

    <p>Simple mode that tries to handle Verilog-like languages as well as it
    can. Takes one configuration parameters: <code>keywords</code>, an
    object whose property names are the keywords in the language.</p>

    <p><strong>MIME types defined:</strong> <code>text/x-verilog</code> (Verilog code).</p>
  </article>