set_clock_latency regarding

[vimalraj205]

hai friends

I have a doubt in a constrain

What is the meaning of the following commands

set_clock_latency -source -early -min 0.6 [get_clocks CLK]
set_clock_latency -source -early -max 0.2 [get_clocks CLK]

set_clock_latency -source -late -min 0.6 [get_clocks CLK]
set_clock_latency -source -late -max 0.2 [get_clocks CLK]

in this what does the -early -late denotes and what does -min -max denotes

thank you

 

[rca]

"-early" is setup
"-late" is hold

 

[vimalraj205]

thank you rca

then what does the max min options implies

thank you

 

[lostinxlation]

PT man page says,

In bc_wc analysis mode, the -min and -max options specify the corner
for the clock latency value (fast or slow), and the -early and -late
options specify the early or late latency value within the corner. In
the on_chip_analysis mode, the min/max operating conditions are the
variation bounds within the single corner analysis. Therefore, only the
min-early and max-late latencies are used for the analysis. In the
on_chip_variation mode, it is sufficient to specify either the
-early/-late options or the -min/-max options for the set_clock_latency
command.

 

[ramesh28]

Olympus manual says,

There are two kinds of latency supported. The default is network latency. If the -source argument is used, the latency type is source latency.

-early argument is used are applied only to the early clock paths, for all early calculations (such as the setup timing target clock path or the hold timing source clock path).

-late argument is used are applied only to late timing, such as setup timing source clock and hold timing target clock.

The use of these arguments is only applicable for source latency and cannot be set with network latency.

Can anyone explain me, target clock path and source clock path?

 

[vimalraj205]

Hai ramesh

thank you for your reply

i hope target clock is the capture clock path and source clock is the launching clock path


since setup check considers late delays on launch clock and early delays on capture clocks

hold check considers early delays on launch clock and late delays on capture clocks

thank you