Honored ContributorI really need to free up some LEs so it would really help if my LPM_MULT blocks could be implemented in the embedded multiplier blocks. How do I do that?
I've looked at the documentation and in Table 25 it suggests that setting DEDICATED_MULTIPLIER_CIRCUITRY to YES is the way forward, but where do I do that?
Honored ContributorHi Oliver,
If you open the LPM_MULT block in the megawizard there is an implementation option where you can select "use dedicated multiplier circuitry". CoGHHonored ContributorYes, I found that, but all the options are greyed out.
Honored ContributorHave you selected Cyclone IV in the megawizard?
Otherwise you can edit the .vhd directly and set the DEDICATED_MULTIPLIER_CIRCUITRY parameter.Honored ContributorYes, I've set the Cyclone IV in the megawizard.
I've looked in the .vhd file and it says -- THIS IS A WIZARD-GENERATED FILE. DO NOT EDIT THIS FILE! This doesn't surprise me, and I guess I can ignore it. When you suggest setting DEDICATED_MULTIPLIER_CIRCUITRY, what's the syntax and where in the file does it belong?Honored ContributorIt should already be there if it is a valid setting.
I created an LPM_MULT for Cycline IV in Quartus 11.1 sp1 and that had the DEDICATED_MULTIPLIER_CIRCUITRY parameter in there but the implementation wasn't greyed either.Honored ContributorCould you please post up your VHDL? I'd like to try editing my file to see if that works.
Thanks in advance.Honored ContributorHere you are.
Honored ContributorThanks, that's very interesting. I'll see what happens.
Honored ContributorOliver, which device are you targeting? the CIVGX15 does not have hard multipliers
Honored ContributorMy device is an EP4CGX22
