Hey everyone, I wanted to know if there's a way to...
# caravela
Anuj Dubey
05/09/2022, 7:29 PMHey everyone, I wanted to know if there's a way to supply an external clock to my design inside caravel. Can I use one of the GPIOs?
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Harald Pretl
05/10/2022, 10:27 AM@User Yes, that should be possible now. You need to declare the net as a clock net, and there were some practical issues in OpenLane which caused trouble, but this should be resolved in a recent version.
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Matt Venn
05/10/2022, 12:35 PMwhat were the issues before?
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Matthew Guthaus
05/27/2022, 3:07 PMYes, there were. You had to rewrite your own constraints file for STA
Matthew Guthaus
05/27/2022, 3:08 PMAnd it was difficult because, I believe, STA needed it to be a pin but clock synthesis required it to be a net
Matthew Guthaus
05/27/2022, 3:08 PMSo you needed to make sure that synthesis didn't change the pin name by making it a module pin