Hi, I have the following warning and I don't know ...
# timing-closure
r
Hi, I have the following warning and I don't know if it's important and how to solve it. The document doesn't talk about slew violations. The warning:
[WARNING]: There are max slew violations in the design at the typical corner. Please refer to /project/openlane/core/runs/core/reports/routing/25-spef_extraction_sta.slew.rpt
k
Hi @User I had the same issue, but have not found the solution. I suppose the developers are working on that. There are more people with this problem @User
r
And do you know if this warning is something very important to take care about it that may prevents the chip to work?
k
it is the violation of the maximum transistion tim of the clock
so I suppose it should work as setup violatine, just loweer the clock speed and it will work
try to run the flow with the new clk rate which is like 20% greater than your target one
r
I changed the period from 50 to 75 and I still have the warning. But the the violations numbers changed from 0.9 to 0.5
k
Actually what you did You have lovered the frequency, give it a try for 40 ns of period
r
I tried even with 20 and I get the same warning
k
@User the lower the period the most likely You got error
m
@User would also be good to get some followup on this one
@User