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<li><a class=active href="#">Verilog</a>
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<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>
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