VCS support for passing time variables to a function

Monkey_man · Junior Joined: Oct 07, 2008 Posts: 6

Does VCS support passing SystemVerilog variables of type "time" to functions? When I try the snippet below the variable "t" in function "huh" is always 0, even though the value I'm passing in is 2us. This code in Questa displays the expected "2000". Am I missing something? What clean alternatives are there to passing "time" data types to a function in VCS?

VCS Compiler version E-2011.03-SP1

module top;
reg clk;
time k = 2us;
initial begin
huh(k);
end
function void huh(time t);
$display("time %t", t);
endfunction
endmodule

Thanks in advance...

Monkey_man · Junior Joined: Oct 07, 2008 Posts: 6

I figured out that in VCS you need to specify the timeunit and timeprecision for the time variable scale to be correct. I must have used different default values for timeunit & precision in my VCS vs Questa sims, hence the different results.