Honored ContributorHi,
I have to use floating number with my VHDL code wich wille be implemented in a de2 card so how can I use floating point?? I have seen that this method use number between (-128)et 127 if I have to use number over this interval biger then 127 what can I do?? thank you.
Honored Contributordo you mean fixed point or floating point? fixed point is just integer arithmatic with an offset. floating point is usually 32 bits. ALtera provides floating point cores.
Honored ContributorI mean floating point, witch is indicated in this link
http://en.wikipedia.org/wiki/fast_inverse_square_root#overview_of_the_code !!???Honored ContributorThen you need to use the Altera floating point IP cores from the megawizard
Honored Contributoryes but I want to use number bigger than 127 for example 200.5 or -241.2. so what can I do thank you
Honored ContributorI dont know where you got this idea of limitation from - but Altera IP cores can go up to 32 bit floating point, meaning they can go from -3.4028234 × 10^38 to 3.4028234 × 10^38
Thats a rather large range.Honored ContributorI have found it in the some link "The next 8 bits form the exponent, which is biased in order to result in a range of values from −128 to 127..."
I will try with your idea thank you very much.Honored ContributorThe range of values from −128 to 127 is for exponent part of your floating number, not the number itself.
I also head for synhtetisable floating point. I have found IEEE packages that work in ModelSim but not in Quartus yet (version <= 12.0sp1).Honored Contributorok thank you very much mmTsuchi I haven't concentrate for this :)
I have found also a package, hoping that will be synthetisable with quartus, I m working with 9.0 version thank youHonored ContributorThe '93 compatible versions of this library will work just fine in quartus. But you'll get some terrrible Fmax figures because there is no way to pipeline them.
Honored Contributorcan you explain more please, Tricky ??!! because I don't understand ""get some terrrible Fmax figures""
thanks
