Forum Discussion

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

Assignments for vectors inequal in length

let's t and d - unsigned vectors and they have different length, and perhaps reverse range does assignment t := to_unsigned(to_integer(d), t'length) right? what is regular way?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

integers are limited to 32 bits signed (31 bits unsigned), so this way is not universal.

You also would never have a reverse range unsigned value. The result of any arithmatic will always be (N downto 0). So it doesnt really matter how you declare it - the left bit is always the MSB.

it would be much easier just to use the resize function:

t := resize(d, t'length);