cell_rise(fall) rise_transition(fall)

[hfooo1]

rise_transition

info of BUF in slow.lib:
pin(Y) {
timing() {
related_pin : "A";
timing_sense : positive_unate;
cell_rise(delay_template_7x7)
rise_transition(delay_template_7x7)
cell_fall(delay_template_7x7)
fall_transition(delay_template_7x7)
}
}
what do cell_rise(fall) and rise_transition(fall) mean ?

 

[Nandy]

cell_rise rise_transition

cell_rise/fall is the gate delay table for A->Y
rise/fall_transition is the output pin Y transition.

www.nandigits.com
Netlist Debug/ECO in GUI mode

 

[useless_skew]

cell_rise

Look at the attachement.

 

[hfooo1]

cell_fall rise_transition

thanks a lot !
very clear!

Added after 1 hours 52 minutes:

if those threshold in std.lib are set different from those of ram.lib and PLL.lib
what should i do?