新手有问题的小程序，望各位指教

huiyanhuishi

`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 [31:0] wave;
reg [31:0] wave;
reg rfd;
wire [17:0] dividend;
wire [7:0] divisor;
wire [17:0] quotient;
wire [13:0] fractional;

wire [14:0] a;
wire [14:0] b;
wire [14:0] s;

reg [14:0] 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 [17 : 0]
        .divisor(divisor), // Bus [7 : 0]
        .quotient(quotient), // Bus [17 : 0]
        .fractional(fractional)); // Bus [13 : 0]
subip wavesub (
        .a(a), // Bus [14 : 0]
        .b(b), // Bus [14 : 0]
        .clk(clk),
        .s(s)); // Bus [14 : 0]

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