@oe1cxw I'm trying to add full support for GP4's FFs to yosys. basically one can get either Q or QN, but not both at same time
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yes. With some hacks in the ABC pass to preserve the $_FNOT_ during logic optimization.
but that's just an optimization to use the inverted output more often. IIRC dfflibmap should already be able to map to ff w/ qn.
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If not, open a issue on GitHub and I'll look into it later today.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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from my quick checks, it can, but then it ignores the ff without qn
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and that makes sense; dfflibmap doesn't have enough information for any individual dff to decide whether q or qn is needed more
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