hoho, Bob, 1 question again for CTS

Hi,

'dbIsNetClock', uses the timing information to tell is a net is clock or not.
You should load the SDC and update the timing before using this command.

Hi,

As you read a DEF, the informations are saved on an other property. If you read you SDC and update your timing you may have problem with multimode. So teh better is to make two tests:

Here is my script:

proc userCreateClockList { clockFile {option w} } {
set f [open $clockFile $option]
dbForEachCellNet [dbgTopCell] n {
set netname [dbNetName $n]
if {[dbIsNetClock $n] || [dbIsNetDefInClock $n]} {
puts $f "$netname"
}
}
close $f
}
And so you can use:

userCreateClockList $STM_clockNetsReport "w"

Regards ... Luc ...

Thank you all! This is really the solution I need.

Lutin:

I really dont not know why comands like 'dbIsNetClock' and 'dbIsNetDefInClock' doesn't work.
I have to 1st specify clock tree, then saveClockNet, then remark the clock net as 'dbSetIsNetclock'.

BRs

Hi,

To access to dbIsNetDefInClock, you need to have run the clcokTreeSynthesis.
To access to dbIsNetClock, you need to have read SDC timing constrain file, and to have run a timing command (to propagate the clock information). So you need at least "report_timing".

Try and let me know ....

Regards .....

HI ,

I am looking to find out if all the flops are getting clocks in design . i wish to do this early at the floorplan stage itself  just as a design check . Is there a way to do this ?  i tried to use dbIsNEtDefInClock in a snmall script but i think it only works on a cts database.

Kindly point me to any command if available to check clock attribute on net before cts.

Thanks, 

Kiran 

Have a look at this solution, "How to list flops not getting covered by CTS":