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Confused by set_output_delay

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shockie

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set_output_delay

I don't konw whether set_output_delay -max or min could constrain the setup time or hold time or not . one said that it can constrain the hold time if add min condition. So could anybody describe it in details .
thank you !
 

kinysh

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set_output_delay example

set_output_delay -0.3 -min
this is for 0.3 ns hold time

by the way,for more detail you can search solvnet. I get it from there too
 

wllee

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synopsys set_output_delay

Here are some example!!!
Assume your output port(OUT1) need pass logical circuit to another DFF input.
assume logical delay max 14ns(worse case), min 4ns(best case)
and DFF need 0.8ns setup time and 0.4ns hold time
the min external delay time is (min. path - hold time) = 3.6 and the max
external delay is (max path + setup time) = 14.8
your constraint maybe like
create_clock -period 40 waveform { 0 30 } find(port CLK)
set_output_delay -clock CLK -min 3.6 -max 14.8 find(port OUT1)
 

shockie

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set_output_delay

I get it ,Thank you!
solvnet.synopsys.com have many solv. enjoy it
 

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