1,?ò??allegro constraint manager-->net-->routing-->relative propagation delay
2,?ó±ê???üsystem?????????????¨brd ????????-->creat-->match group-->????????×??¨????name?¨±???PCI1)
3,?ó±ê???üPCI1--membership-->match group-->?????ù???è???¤???è?¨??net??members
4,pin pairs ??longest pin pair?? scope??global relative delay-->delta:tolerance(mil),???????????????¨±???0mil??100mil??
5,route ?ê?????óactual???????á??net ?¤?????????????????????ò?ú×????ò???ù????net?à?????????¤????±???100mil???? ???????ì???????ò???÷???ú×????ò????????·?±?±í???¤?ò????,?÷????????ok


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????????setup---electrical constraint spreadsheet??????constraint manager