@User: I suppose it would have been a good idea to alert you to the new procedure for MC simulations. . . What you need to do now is use

.lib <path_to>/sky130.lib.spice mc

. . . and that should be the only thing you need to do. However, all non-MC simulations have to set

.param mc_mm_switch=0

or

=1

to disallow or allow mismatch simulation (the reason being that any corner simulation can run either with mismatch enabled or with mismatch disabled, but

mc

is mutually exclusive with all corner simulations). The only alternative I can think of is to duplicate all the entries in

sky130.lib.spice

so that there is one corner with mismatch and one corner without mismatch, such as

tt

and, say,

mmtt

. I might do that if people have a hard time figuring out that they need to set the

mc_mm_switch

parameter.