Clock Propagation after CTS

[kumar_eee]

How do you know whether the particular clock is propagated or not after CTS?

 

[pradeeppiskala]

report timing on the group. if your see clock network delay ( propagated) with some value, then the clock is propagated.

if it is ideal , run set_propagated_clock [all_clocks]

 

[jeevan.life]

or you can do set_propagated_clock [get_clocks *]

 

[kumar_eee]

Thanks pradeep & Jeevan.

Any other ways to identify?

report_timing will take lots of time depending on your design gate count.

 

[morris_mano]

report_timing will take lots of time depending on your design gate count.

You can use report_timing to report for a single path as well. Try to choose D pin of flip-flop whose clock is driven by the clock you want to see whether propagated or not. For ex:

report_timing -view func_worst -to dut/sr_q_reg/D

The report_timing will take less time to run. After that, as mentioned above by pradeep, just look at clock network delay value to see if it is ideal or propagated.

 

[ravipandu46338@gmail.com]

As per my knowledge ALL CTS BUILT CLOCKS ARE PROPOGATED AUTOMATICALLY.....,no need to use set_propogated_clock command



With Regards,
D.Raviteja

 

[sam536]

PT need set_propagated_clock even after CTS..


Kiran , hope you know abt attributes in PT. I am not sure the correct attrbute. check in PT if you have licnese.

below is the command to know clock is propagated to not.

get_attr [get_clock XXX] is_clock_propagagted. If yes, its propagated.

how top find attributes. in Pt:
list_attr -help .

list out only clock attributes and find out.

 

[saikasyap]

I think report_clock command shows the attributes (none for ideal || p for propagated).

Please correct me if I am wrong...

-Kasyap

 

[soloktanjung]

You can use this also:

check_timing -type clocks

Yes report_clock command also can be used.

Thanks.