and automatic buf bufif0 bufif1 cell cmos deassign default design disable edge else event for force forever fork genvar if ifnone inout input instance join liblist library nand negedge nmos nor not notif0 notif1 or output parameter pmos posedge pulldown pullup release remos repeat rnmos rpmos rtran rtranif0 rtranif1 showcancelled specparam tran tranif0 tranif1 trireg use wait while xnor xor