arithmetic operations between logic vectors and constants

itay Guest #3758482 
what is the prefered option of arithmetic operations using  logic 
vectors and constant? convert logic vector to integer and do the 
operation or to convert the constant to logic vector?

I have samples from A/D as logic vectors with some resolution and 
constants. I want to do arithmetic operations between them according to 
formula?
if anyone has examples of such thing it will be very helpfull (VHDL).
Reply Quote Edit Move Thread sperren Slow mode Anmeldepflicht aktivieren Anpinnen Delete topic Thread mit anderem zusammenführen Report Thanks
Lothar M. Moderator (Company: Titel) #3758681 
Never ever do an arithmetic calculation on a unconstrained vector. For 
calculating you have signed, unsigned and integer data types.

Why? When calculating with std_logic_vectors you cannot determine 
whether its an unsigned or a signed operation. And if you simply copy 
the few lines with the calculation you discard this information.
Reply Quote Edit Delete Report Thanks
Watch this topic

Reply

A question of your own? This thread is over 12 years old. Ask it in a thread of its own – more people read along there, and it gets answered more often and sooner.

Start a new thread

A fix, an addition or feedback on this thread? Then reply here.

Formatting
  • [c]C-Code[/c]
  • [vhdl]VHDL-Code[/vhdl]
  • [code]code in other languages, ASCII drawings[/code]
  • [math]formula (LaTeX syntax)[/math]
  • [[Title]] – link to an article
  • Link to another post: right-click its post ID (#8078628), copy the address, paste it into the text

More about formatting

Post long source code as an attachment, not in the text.

Your name and e-mail address

Already registered? Log in

Not shown to anyone. We send you a link; your post appears once you confirm it there.

By submitting you create a free account and accept the terms of use.