昨天给altera论坛发帖子问关于 TH的问题，因为我使用的是classic timing analyzer ，altera论坛技术人员说现在classic timing analyzer已经过时了，希望我能采用timequst。
 看来要开始学习timquest了 。

原帖如下
i am sorry to trouble you ,but i have aproblem when i use the quartus10 and the timing analyzer is classsis timing analyzer .

first : when i click the assignment -> setting -> classic timing analyzer setting , then in the interface， i find the "th " , then i set the "th" 1ns ,it is ok, but i set it ''1.5ns" ,it show 15ns ,
then i use the .qsf ,and i use the TCL language which is "use set_global_assignment -name TH_REQUIREMENT "1.5 ns" " ， and in the " assignment setting " ,the TH_REQUIMENT show 1.5ns ?

then my quartus is why i cannot set the th "1.5ns" in the" assignment -> setting -> classic timing analyzer setting ,th" but i can set it in .qsf .
can you tell me which setting is write ?
thank you very much 。
回复如下 ：
I suggest you switch to TimeQuest, which is the recommended design flow. Classic Timing Analyzer is obsolete, maybe not supported well in Quartus any more, as far as I know.
英文不好，请见谅