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Altera_Forum
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14 years ago

ModelSim "out of range" issue

I have the following code: Library IEEE; use IEEE.Std_Logic_1164.all; use IEEE.numeric_std.all; use IEEE.Math_real.all ; ... WIDTH_DQ : natural := 9 ; X : in integer rang...
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Altera_Forum
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14 years ago

Hello Dave and Kevin,

thanks for working on this while I was sleeping ...

Dave, I had all my X and Y in a list window and did not see what you see. Maybe I had too many signals in the list window to see it clearly. I redo this all later tonight after finishing a few urgent issues on other parts in the project.

Kevin, advice well taken. I'll validate the ranges by doing some worst case sequences on paper (or script it). The design is a Cordic Machine. I just assumed that doubling the range, enough to handle the Cordic Gain of about 1.646 would have sufficed. I'll apologize later :)

Regards,

Josy