添加上述综合属性的目的，就是解决下述问题：
Warning(14284): Synthesized away the following node(s):
Warning(14285): Synthesized away the following node(s) of type LCELL buffer:
Warning(14320): Synthesized away node "inst18"
Warning(14320): Synthesized away node "inst19"
Warning(14320): Synthesized away node "inst3|u_TDL_CC_Top|a_sig[511]"
Warning(14320): Synthesized away node "inst3|u_TDL_CC_Top|a_sig[510]"
........................................................................................................................................
Intel官网也有对应保留信号用于测试、调试用的综合属性说明：https://www.intel.com/content/www/us/en/docs/programmable/683236/21-4/preserving-signals-for-monitoring-and.html
作者： coyoo， 来源：面包板社区
链接： https://mbb.eet-china.com/blog/uid-me-1010859.html
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