What exactly tpd and tco ?

[narasimha_80]

tco tpd

Hello,

1. Can any body write to me what exaclty tco and tpd in flip flops ?
2. What is the relation( formula) between fmax, tsu,th,negative and positive clock
skews in FPGA ?



Best Regards,
Narasimha Naik

 

[anjali]

tsu tco tpd th

tpd - propagatinal delay
tco - combinational delay

to satisfy setup conditions,
Tclk >= Tsu + Tco,max + Tcq

to satisfy hold conditions,
Th > Tcq + Tco,min

 

[eeeraghu]

tco tpd th

and from the above equation fmax = 1/Tclk(time period of a clk)