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4 bit Counter 開發板示範

4 bit Counter 開發板示範. 主程式. `timescale 1ns / 1ps module count_4bit ( input clk, input reset, output [3:0] q ); reg [3:0] counter; wire clkm; reg [31:0] divider; // 除頻電路 always@( posedge clkm , negedge reset ) begin if ( ! reset )

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4 bit Counter 開發板示範

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  1. 4 bit Counter開發板示範

  2. 主程式 `timescale 1ns / 1ps module count_4bit( input clk, input reset, output [3:0] q ); reg [3:0] counter; wire clkm; reg [31:0] divider; //除頻電路 always@( posedge clkm, negedge reset ) begin if ( ! reset ) counter <= 4'b0000; else counter <= counter + 1; end assign q = counter; endmodule

  3. 除頻電路 //除頻電路------------------------------------------------------ always@(posedge clk or negedge reset ) begin if ( ! reset ) divider <= 32'h0000_0000 ; else divider <= divider + 1; end assign clkm = divider[25]; // 40M/2^25=0.8388 sec

  4. 步驟 • 建新專案(指定元件編號) • 編輯原始程式 • 語法檢查 • 行為模擬 • 指定接腳 • 實作(implement) • 產生燒錄檔(.bit ) • 下載(燒錄)、執行

  5. 開發板元件接腳編號

  6. .ucf(xc3s200a.ucf) • user constraint file (使用者限定(制)檔) NET "reset" LOC = K5; NET "clk" LOC = P9; #-------------------------- NET "led<0>" LOC = J14; NET "led<1>" LOC = H14; NET "led<2>" LOC = K16; NET "led<3>" LOC = J16; NET "led<4>" LOC = K15; NET "led<5>" LOC = K14; NET "led<6>" LOC = J12; NET "led<7>" LOC = J13; #NET "dip<0>" LOC = E6; #NET "dip<1>" LOC = F7; #NET "dip<2>" LOC = F9; #NET "dip<3>" LOC = F10; #-------------------------- #NET "btn<0>" LOC = K12; #NET "btn<1>" LOC = K11; #NET "btn<2>" LOC = J11; #NET "btn<3>" LOC = J10; ......................... ..........................

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