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Design Languages >> Verilog-AMS >> how to use wreal?
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Message started by Monia on Jul 14^th, 2005, 4:20am

Title: how to use wreal?
Post by Monia on Jul 14^th, 2005, 4:20am

I want to drive a wreal net using a real variable.

Doing the folloeing:

module test ()
wreal out;
real out_test;

assign out = out_test;

analog begin
out_test = 19.0;
end

endmodule

I get an error during compilation related to the
"assign" statement":
transition sensitivity on analog value/expression is not supported.

Why?

M

Title: Re: how to use wreal?
Post by Ken Kundert on Jul 14^th, 2005, 7:36am

A wreal is an event-driven signal type and so cannot be made dependent on a continuous time variable. Doing so could make the value of the wreal vary continuously, which its event-driven nature could not reasonable represent.

You must assign to out the value from an event driven variable.

-Ken