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  我想要个黑金 2009-06-09 00:00:00

  参考：http://hi.baidu.com/shangsunpu/blog/item/702af027992c5906908f9d59.html

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  vans来 2009-06-09 00:00:00

  等精度频率计，Z高测到50MHZ.但精度不高，结果送到数码管上显示.我不明白LED怎么显示，谁也没时间现给你做一个你的要求，自己改吧.尽力了 module pinlvji(clk，clk_test，rst，out_wei，out_duan); input clk，rst; output [1:0]out_wei; output [7:0]out_duan; output clk_test; reg [1:0]out_wei; reg [7:0]out_duan=8'b00000011; //a b c d e f g dp reg clk_test=0; // ce shi xin hao reg [1:0] count1=2'b00; reg [24:0] count2=0; reg [18:0] count3=0; reg [5:0] show; //largest 50M reg [3:0] shi; reg [3:0] ge; reg flag=0; //yes or not get to one second reg [19:0] saomiao; reg [7:0] h; reg [7:0] l; always@(posedge clk) begin //creat a test signal 'clk_test' if(count1==2'b11) begin // 50/8M count1<=2'b00; clk_test<=~clk_test; end else count1<=count1+1; end always@(posedge clk or negedge rst) begin //wait for 1 second ，then flag=1 if(!rst) count2<=0; else begin if(!flag) count2<=count2+1; if(count2==25000000) begin // 1 second flag<=1; end end end always@(posedge clk_test or negedge rst) begin //ji shu qi (1) if(!rst) count3<=0; else if(!flag) begin count3<=count3+1; if(count3==500000) begin //1M count3<=0; show<=show+1; end end end always@(posedge clk) begin //scan saomiao<=saomiao+1'b1; if(!rst) begin case(saomiao) 1 :begin out_wei<=2'b10; out_duan<=8'b00000011; //0 end 300000:begin out_wei<=2'b01; out_duan<=8'b00000011; //0 end 600000:saomiao<=0; endcase end else begin case(saomiao) 1 :begin out_wei<=2'b10; if(flag) out_duan<=l; end 300000:begin out_wei<=2'b01; if(flag) out_duan<=h; end 600000:saomiao<=0; endcase end end always@(posedge clk) begin case(shi) 0:h=8'b00000011; 1:h=8'b10011111; 2:h=8'b00100101; 3:h=8'b00001101; 4:h=8'b10011001; 5:h=8'b01001001; 6:h=8'b11000001; 7:h=8'b00011111; 8:h=8'b00000001; 9:h=8'b00011001; default:h=1'bx; endcase case(ge) 0:l=8'b00000011; 1:l=8'b10011111; 2:l=8'b00100101; 3:l=8'b00001101; 4:l=8'b10011001; 5:l=8'b01001001; 6:l=8'b11000001; 7:l=8'b00011111; 8:l=8'b00000001; 9:l=8'b00011001; default:l=1'bx; endcase end always@(posedge clk) begin //show case(show) 0:begin shi=0;ge=0; end 1:begin shi=0;ge=1; end 2:begin shi=0;ge=2; end 3:begin shi=0;ge=3; end 4:begin shi=0;ge=4; end 5:begin shi=0;ge=5; end 6:begin shi=0;ge=6; end 7:begin shi=0;ge=7; end 8:begin shi=0;ge=8; end 9:begin shi=0;ge=9; end 10:begin shi=1;ge=0; end 11:begin shi=1;ge=1; end 12:begin shi=1;ge=2; end 13:begin shi=1;ge=3; end 14:begin shi=1;ge=4; end 15:begin shi=1;ge=5; end 16:begin shi=1;ge=6; end 17:begin shi=1;ge=7; end 18:begin shi=1;ge=8; end 19:begin shi=1;ge=9; end 20:begin shi=2;ge=0; end 21:begin shi=2;ge=1; end 22:begin shi=2;ge=2; end 23:begin shi=2;ge=3; end 24:begin shi=2;ge=4; end 25:begin shi=2;ge=5; end 26:begin shi=2;ge=6; end 27:begin shi=2;ge=7; end 28:begin shi=2;ge=8; end 29:begin shi=2;ge=9; end 30:begin shi=3;ge=0; end 31:begin shi=3;ge=1; end 32:begin shi=3;ge=2; end 33:begin shi=3;ge=3; end 34:begin shi=3;ge=4; end 35:begin shi=3;ge=5; end 36:begin shi=3;ge=6; end 37:begin shi=3;ge=7; end 38:begin shi=3;ge=8; end 39:begin shi=3;ge=9; end 40:begin shi=4;ge=0; end 41:begin shi=4;ge=1; end 42:begin shi=4;ge=2; end 43:begin shi=4;ge=3; end 44:begin shi=4;ge=4; end 45:begin shi=4;ge=5; end 46:begin shi=4;ge=6; end 47:begin shi=4;ge=7; end 48:begin shi=4;ge=8; end 49:begin shi=4;ge=9; end 50:begin shi=5;ge=0; end 51:begin shi=5;ge=1; end default:begin shi=1'bx;ge=1'bx; end endcase end endmodule

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