what's the difference between cell_rise & rise_transiti

[bendrift]

cell_rise

in lib ,like the following :
cell_rise(lu5X5) {
values("0.057, 0.079, 0.175, 0.269, 0.433",\
"0.196, 0.217, 0.345, 0.482, 0.712",\
"0.353, 0.374, 0.497, 0.661, 0.932",\
"0.824, 0.845, 0.961, 1.119, 1.454",\
"1.607, 1.629, 1.741, 1.891, 2.210") ;
}
rise_transition(lu5X5)
values("0.100, 0.103, 0.184, 0.269, 0.411",\
"0.414, 0.414, 0.451, 0.574, 0.773",\
"0.775, 0.775, 0.775, 0.860, 1.102",\
"1.856, 1.856, 1.856, 1.856, 1.957",\
"3.657, 3.657, 3.657, 3.657, 3.657") ;
}
what 's the difference between cell_rise & rise_transition?thank u

 

[megastar007]

cell_rise rise_transition

Cell_rise is used to know the cell delay by looking into input transition and its corresponding output load.

Rise_transition is used to calculate output transition time(which will be input transition time for next cell )

 

[shiv_emf]

rise_transition

suppose max_capacitance is .033pf
n tech lib used is slow.db

how is optimization taking place ... ??
my netlist ws 2 cells of OAI21XL and 2 cells of AND21x (not sure of and gate name)

when i compiled n gave report_constraint -max_capacitance -verbose

at out1 ..
capacitance ws .002398 (some thing of this sort)

how to C this value in slow.lib ?

fall_transition n cell_fall ....... y hav they given different look up tables????????????????
thanq