fsdb DUMP的操作记录
参考链接：
https://blog.csdn.net/ohuo666/article/details/124973939
https://blog.csdn.net/ohuo666/article/details/124973939
https://blog.csdn.net/yuexiangallan/article/details/121760768https://blog.csdn.net/yuexiangallan/article/details/121760768
https://blog.csdn.net/qq_22168673/article/details/126147927?spm=1001.2101.3001.6650.19&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-19-126147927-blog-122474326.pc_relevant_3mothn_strategy_recovery&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-19-126147927-blog-122474326.pc_relevant_3mothn_strategy_recovery&utm_relevant_index=23https://blog.csdn.net/qq_22168673/article/details/126147927?spm=1001.2101.3001.6650.19&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-19-126147927-blog-122474326.pc_relevant_3mothn_strategy_recovery&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-19-126147927-blog-122474326.pc_relevant_3mothn_strategy_recovery&utm_relevant_index=23
https://blog.csdn.net/moon9999/article/details/123907101?spm=1001.2101.3001.6650.13&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-13-123907101-blog-125900025.pc_relevant_multi_platform_whitelistv4&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-13-123907101-blog-125900025.pc_relevant_multi_platform_whitelistv4&utm_relevant_index=21https://blog.csdn.net/moon9999/article/details/123907101?spm=1001.2101.3001.6650.13&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-13-123907101-blog-125900025.pc_relevant_multi_platform_whitelistv4&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-13-123907101-blog-125900025.pc_relevant_multi_platform_whitelistv4&utm_relevant_index=21
实操记录：
initial begin
wait(signal == 1); //开始dump波形条件
$fsdbSwitchDumpfile(2000,"output.fsdb",5); //最大2000M，5个
$fsdbDumpvars(0,instance,"+all"); //instance以下所有层级，dump all
#100;
$fsdbDumpflush;
$fsdbDumpFinish;
end