Forum Discussion

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

question about unsigned constant

Hi everyone, I meet a problem when I am trying to define a one bit unsigned constant. I think declaration should be constant var1: unsigned :='1'; But everytime I try this, it always be...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

--- Quote Start ---

The definition involves two faults.

- it's missing a size constraint

--- Quote End ---

When declaring a constant, sizing is implicit in the constant value, so explicit sizing is not required.

constant A : unsigned := "0";

is perfectly legal.