How to Calculate the library setup time?

[RGR]

Hi Every one

The library setup and hold times are generally in the library (.db or .lib) and how these are calculated?

Here is the Example Report.

data arrival time 0.57

clock mck (rise edge) 2.50 2.50
clock network delay (ideal) 0.00 2.50
library setup time -123.44 -120.94
data required time -120.94
--------------------------------------------------------------------------
data required time -120.94
data arrival time -0.57
--------------------------------------------------------------------------

Thanks

RGR

 

[Venkatesh Pemmanaboyina]

by using spice simulation the min delay (setup time) required between data and clock so that data is captured to output is calculated.

DATA __ __/```````\___
CLK _/``\__/``\__
OP _______/`````
for example, the simulation is done in number of steps by decreasing delay between data and clock. in each it verify the output (should be 1 in above case). in this way the min time between between clk and data pin gives the steup time.