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verilog模块

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fpga_feixiang 发表于 2019-8-22 16:06:56 | 显示全部楼层 |阅读模式
模块结构
    端口: module 模块名(端口1, 端口2, 端口3)
    内容:
        I/O说明:
            input 端口名;
            output 端口名;
        内部信号:
            reg [width-1:0]  r变量1,r变量2;
            wire [width-1:0] w变量1,w变量2;
        功能定义:
            a. assign 连线
                assign a = b&c;
            b. 实例化其他元件
                and and_inst(q, a, b);
            c. always模块
                always @(posedge clk or posedge clr)
                begin
                    if(clr) 
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; q <= 0;
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; else
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; if(en)
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; q <= d;
&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; end

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