新手有问题的小程序，望各位指教
`timescale 1ns / 1ps//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 09:02:41 09/15/2011
// Design Name:
// Module Name: triwave
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module triwave(clk,wave);
input clk;
output wave;
reg wave;
reg rfd;
wire dividend;
wire divisor;
wire quotient;
wire fractional;
wire a;
wire b;
wire s;
reg counter;
always @(posedge clk) begin
if((counter>=0)&&(counter<10000)) begin
counter<=counter+1;
end
else if(counter==10000) begin
counter<=0;
end
end
divip wavediv (
.clk(clk),
.rfd(rfd),
.dividend(dividend), // Bus
.divisor(divisor), // Bus
.quotient(quotient), // Bus
.fractional(fractional)); // Bus
subip wavesub (
.a(a), // Bus
.b(b), // Bus
.clk(clk),
.s(s)); // Bus
always begin
if((counter>=0)&&(counter<5000)) begin
dividend<=counter;
divisor<=50;
end
else if((counter>=5000)&&(counter<10000))
a<=10000;
b<=counter;
dividend<=s;
divisor<=50;
end
end
assign wave=quotient<<14+fractional;
endmodule
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