In Verilog, all delays are governed by `timescale directive in the source file.
-timescale=<time_unit/time_resolution>
This is analysis time option. If present on the vlogan command line, it is applied to all files which have no timescale of their own(resetall
) or not yet hit any timescale directive from other files during parsing order.
-override_timescale=<time_unit/time_resolution>
If applied at the analysis time, this option overrides the timescale of all analyzed modules into the same work library from all previous analysis commands. Hence,-override_timescale replaces timescale of all the modules that are analyzed so far into
the work library.
Ref: https://solvnet.synopsys.com/dow_retrieve/latest/VCS_MX/ni/vcsmx_ug.pdf