Re: FPGAs: basic question: two-level AND-OR vs. two-level OR-AND

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The classical, so-called SRAM-based FPGAs implement logic in 4-input
Look-Up Tables, each with one output, implementing any function of those
four inputs. AND and OR are just more primitive ways of expressing logic
functionality. That's also why Karnaugh maps have become meaningless. If
you can express it as a function of four variables, there is nothing
more to do or to be optimized: It fits in one LUT.

Peter Alfke
Neil Zanella wrote:
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