Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Devide in VHLD

I want to implement this function : A<= B/x"A", when I compile, the Quartus put a notice: "/" used but didn't declare. When I try with "*" (multiply) or "+" (add), it is ok. I don't know this er...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

--- Quote Start ---

The output is not valid until CNT is 2 anyway, so until then all signals are rubbish.

--- Quote End ---

Valid result or not, a registered output can't change arbitrarily. Or the design's timing is completely broken.

--- Quote Start ---

Because Modelsim does not support for LPM library. And when I use multiply command directly, the result's not true with the negative number.

--- Quote End ---

Last time I used it, all LPM libraries simulated fine in ModelSim. Sorry, I also don't understand about the negative number problems. At least, I wasn't aware of it (since Quartus V2.0).