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Can Voltus do an IR drop analysis on a negative supply?

I have been using Voltus to do IR drop analysis but I got caught on one signal. It is negative. When I use:

set_pg_nets -net negsupply -voltage -5 -threshold -4.5 -package_net_name NEGSUP -force

Voltus dies with a backtrace. Looking at the beginning of the trace you see it suggests that the problem is it set maximum to -5 and minimum to 0. Is there another way to express a negative voltage supply for IR drop analysis?

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