Alliance Series Foundation Series software contain CPLD fitter op
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Alliance Foundation CPLD Fitter Option
Alliance Series Foundation
Series software contain CPLD fitter option called "use advanced fitting." This feature allows software group equations that have same input signals into same function block. would typically this option
_*********Function Block Resource Summary******* Func# tion MacroInputs Signals Total O/IO Block cells Used Used Used Avail
Figure Function Block Resource Summary from Fitter Report.
large designs that cannot because function block input restrictions. your design unable into particular device, take look report (.RPT) file. Designs which appear have plenty pins, product terms, macrocells when mapped into XC9500 device because 36-signal input limit each function block.
example Figure that almost inputs being used. However, total number product terms macrocells each function block fully utilized. This would perfect candidate trying "advanced fitting" algorithm. What exactly does this algorithm differently? There inputs function block XC9500 CPLD architecture. CPLD fitter software will default fitting designs based pin-locking algorithm. This pin-locking algorithm tends spread equations throughout CPLD, ensuring room growth change equations. This spreading function, however, tends number function block inputs very quickly. selecting "advanced fitting" algorithm, software weights common signal usage higher tends group equations with same signals into same function block. result, provides denser larger designs freeing otherwise used inputs from other function blocks.
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