建立时间
Setup time slack = Data Required Time – Data Arrival Time
Data Arrival Time = Launch Edge + Tc2t + Tco + Tr2r
Data Required Time = Latch Edge + Tc2r - Tsu
保持时间
Hold time slack = Data Arrival Time – Data Required Time
Data Arrival Time = Launch Edge + Tc2t + Tco + Tr2r
Data Required Time = Latch Edge + Tc2r + Th