RE: [sv-bc] query related with `timescale

The `timescale compiler directive does not set the time unit or
precision in a compilation unit - it only effects the design elements
that follow it. So you can have as many `timescale directives as you
want in $unit and only the last one before a design element takes
effect. Otherwise, you wouldn't be able to do this:

// begin file.v
`timescale 1ns/1ns
module tmp1();
endmodule
`timescale 1ps/1ps
module tmp2();
endmodule
// end file.v


> 
> However, I think the testcase should still fail due to another
> statement, "There shall be at most one time unit and one time
precision
> for any module, program, package, or interface definition or in any
> compilation-unit scope." This refers to time unit and time precision
> declarations in any way.
> 
> Shalom
> 
> 
> > Should `timescale be consider as timeunit and timeprecision
> > declaration.??
> >
> > Should following testcase pass
> >
> > `timescale 1ns/1ns
> >
> > timeunit 10ps;
> > timeprecision 1fs;
> >
> > module tmp();
> > endmodule
> >
> > According to LRM 19.10
> > "The timeunit and timeprecision declarations can be repeated
> > as later items, but must
> >   match the previous declaration within the current time scope."
> >
> > As some tool is showing error while some passing the above testcase.
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