verilog数字系统设计教程-夏宇闻编著-课后习题答案-考试重点

练习21/2分频，相位相反练习3利用10MBVisiomodulezhouqiwave(reset,F10M,a);inputreset,F10M;outputa;rega;reg[15:0]b;always@(resetorposedgeF10M)if(!reset)begina=0;b=0;endelsebeginif(b==199)begina=~a;b=b+1;endelsebeginif(b==299)begina=~a;b=b+1;endif(b==499)begina=0;b=b+1;endelseb=b+1;endendendmodule`timescale10ns/10nsmodulezhouqiwave_tb;regF10M,reset;wirea;always#5F10M=~F10M;initialbeginreset=0;F10M=0;#5reset=1;#6000$stop;endzhouqiwavem(.reset(reset),.F10M(F10M),.a(a));endmodule