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Xilinx implementation properties for timing performance

Below I have listed the Xilinx implementation properties I use when giving priority to timing rather than area. Settings not mentioned are not as important, or are recommended to be given the default value.

"Exp." means experiment, that is, for that property it might be worth to try with different settings.

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RLOC attributes on inferred logic

The Xilinx constraint RLOC - relative placement - can be very helpful to improve the timing of timing-critical logic.

There is some struggle involved with getting the RLOC's recognized by the Xilinx tools if we wish to enter them through the HDL and on inferred logic rather than on instantiated primitives.

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