clock的时钟频率check代码

 在芯片验证中，经常遇到需要check时钟频率的场景，由于时钟数量有很多，手动写代码得到后年马月，所以我这边写了一个宏define，可以通过输入参数的形式验证需要check的时钟频率，大大提升了验证效率和准确率！！！

`define check_boot_start_crg(ref_freq,clk_path)\forever begin\@(posedge clk_path)\if(cnt == 0) t1 = $realtime;\if(cnt == 1) begin\t2 = $realtime;\freq1 = t2-t1;\$display("t1 = %of, t2 = %0f, freq1 = %0f at time %t", t1, t2, $realtime);\end\if(cnt == 2) begin\t3 = $realtime;\freq2 = t3-t2;\$display("t2 = %of, t3 = %0f, freq2 = %0f at time %t", t1, t2, $realtime);\end\if((freq1 == freq2) && (freq1 != 0)) begin\frequency = freq1;\$display("freqency = %of, ref_freq = %0f at time %t", freqency, ref_freq, $realtime);\if((frequency <= ref_freq*0.99) || (frequency >= ref_freq*1.01)) begin\`uvm_error("soc_clk_check", "clk_path check Failed")else begin`uvm_info("soc_clk_check", "clk_path check Pass", UVM_LOW)\break;\end\end\if(cnt < 2) cnt = cnt + 1;\else if(cnt == 2) cnt = 0;\end\