Honored ContributorHi all;
I want to convert 0.483 to ufixed type. Manually, I get 0000.0111 (3 downto -4) when I calculate by hand. But, this value is not same with the value in modelsim which is 0000.1000. I write like this; ip1<=to_ufixed(0.483,n1); What the correct value of 0.483 in ufixed? Do I calculate in wrong way?..needs help, thanks
Honored ContributorIts 0000.1000 if you round to nearest.
the to_ufixed function does have extra options with regards to rounding and saturation. You'll have to read the function definitions in the fixed_pkg source code or user guide to set them.Honored Contributor0.483 * 2^4 = 7.728, which gets rounded up to 8, which is 1000 in binary. To me it seems Modelsim is right.
Honored ContributorSorry, what actually the formula to convert to ufixed? thanks for reply
Honored ContributorY x 2^f, where f is the number of fractional bits.
Honored ContributorI try 1 example (0.25) for my better understand;
0.25x2^2 = 0.5 which get rounds 1, which is 1 in binary. Do I right? thanks for replyHonored Contributor0.25*2^2 = 1
Honored ContributorHonored ContributorSorry for the miss typing..and I think I misunderstanding the concept.
I try another example (9.75): 9.75x2^2=39 which is 100111 in binary. The answer is 1001.11 Do I right? thanks for replyHonored ContributorYes this is right
Honored ContributorOkay I undersatand now, many thanks Tricky and Daixiwen!
