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Altera_Forum's avatar
Altera_Forum
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13 years ago

Help with modelling with MODELSIM

Hello there again, I tried to simulate my first code in MODELSIM. Can someone help me simulate it properly, at the moment I am just a beginner and would like to know if there is any window which can ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

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your signal qs needs to be initialised to zeros first at declaration. Quartus wouldn't care about that but modelsim assumes unknown state until you put zero thus the assignment qs(i) <= not qs(i) will always stay U in Modelsim but will toggle in quartus.

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Some progress after your advise, but still a little behind from being ok but lesson 1 learned to always FORCE signal states to 0 to start with. Tried with qs first.