目前写过最长的verilog代码，用了将近三个小时，编写12h显示的时钟，改来改去，估计只有我自己看得懂（吐血）

module top_module(input clk,input reset,input ena,output pm,output [7:0] hh,output [7:0] mm,output [7:0] ss); couter10 couter10_1(clk, reset, ena, ss[3:0]);couter6 couter6_1(clk, reset, ss[3:0]==9&&ena, ss[7:4]);couter10 couter10_2(clk, reset, (ss[7:4]==5 && ss[3:0]==9)&&ena, mm[3:0]);couter6 couter6_2(clk, reset, (mm[3:0]==9 && ss[7:4]==5 && ss[3:0]==9)&&ena, mm[7:4]);couter10_forh couter10_forh_1(clk, reset, (mm[7:4]==5 && mm[3:0]==9 && ss[7:4]==5 && ss[3:0]==9)&&ena,(hh[7:4]==1 && mm[7:4]==5 && mm[3:0]==9 && ss[7:4]==5 && ss[3:0]==9)&&ena ,hh[3:0]);couter1 couter1_1(clk, reset, (hh[3:0]==9 && mm[7:4]==5 && mm[3:0]==9 && ss[7:4]==5 && ss[3:0]==9)&&ena,(hh[3:0]==2 && mm[7:4]==5 && mm[3:0]==9 && ss[7:4]==5 && ss[3:0]==9)&&ena,(hh[3:0]==1 && mm[7:4]==5 && mm[3:0]==9 && ss[7:4]==5 && ss[3:0]==9)&&ena, hh[7:4],pm);endmodulemodule couter10(input clk, input reset, input ena, output [3:0] q);always@(posedge clk)if(reset || (q==9&&ena))q <= 0;else if(ena)q <= q + 1;elseq <= q;
endmodulemodule couter6(input clk, input reset, input ena, output [3:0] q);always@(posedge clk)if(reset || (q==5)&&ena)q <= 0;else if(ena)q <= q + 1;elseq <= q;
endmodulemodule couter10_forh(input clk, input reset, input ena,input reload, output [3:0] q);always@(posedge clk)if(reset)q <= 2;   else if(q==9&&ena)q <= 0;   else if(q==2&&reload)q <= 1; else if(ena)q <= q + 1;elseq <= q;
endmodulemodule couter1(input clk, input reset,input ena, input reload ,input pmset ,output [3:0] q,output pm);always@(posedge clk)if(reset)beginq <= 1;pm <= 0;endelse if((q==1)&&pmset)beginq <= q;pm <= ~pm;endelse if((q==1)&&reload)beginq <= 0;pm <= pm;  endelse if(ena)beginq <= q + 1;pm <= pm;endelsebeginq <= q;pm <= pm;end
endmodule