specifying clock rise/fall slopes for propagated clocks

[taylor-bsg]

Is this possible? I checked the docs and did not see any mention of it.

Thanks!

[jjcherry56]

Not really. You want the delay calculation for gate delays in the clock network but not the slews? It is a strange request. Seem like you should be using ideal clocks with set_clock_latency and set_clock_transition.

[taylor-bsg]

Thanks for your reply. What I mean is, let's say you have a clock tree and you have parasitics for it. The clock tree still has a source, for which we want to specify a slew; what is the mechanism for specifying this?

[jjcherry56]

set_input_transition

[taylor-bsg]

Actually I am saying, I want it to time the clock tree and everything with slews etc, but the clock input pin itself has a slew.

On Thu, Aug 25, 2022 at 11:36 AM James Cherry @.***> wrote:

Not really. You want the delay calculation for gate delays in the clock network but not the slews? It is a strange request. Seem like you should be using ideal clocks with set_clock_latency and set_clock_transition.

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[taylor-bsg]

Okay great, I did not know this could be applied to a clock signal as well.

M

On Fri, Aug 26, 2022 at 7:13 AM James Cherry @.***> wrote:

Closed #117 https://github.com/The-OpenROAD-Project/OpenSTA/issues/117 as completed.

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