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Setup and Hold
Calculator
[Desktop view only]

Setup Timing equation  :  ( Clock Period - Setup Time (of the capturing flip-flop)) - (CK→Q Delay (of Launching flip-flop) + Datapath delay) - setup uncertainty > = 0

Hold timing equation :   ((Cell delay of launch + Launch flop clk2q + Data path delay)) -(Library hold time +  (Cell delay of capture path) )- hold uncertainty > = 0   

Constraints inputs: 
 

create_clock main_clk period period_value      -waveform {     }[ get_port main_clk ]

_ _

set_clock_uncertainty -setup        [get_clocks main_clk ]

set_clock_uncertainty -hold          [get_clocks main_clk]

set_timing_derate  -early            -cell_delay

set_timing_derate  -late             -cell_delay       

CK

Q

DFF

CK

D

DFF

Launch clock path

Capture clock path

main_clk

__

__

Clock Skew = 

__

Setup Slack  =
Hold Slack =   

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