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VHDL choice warning at
CAUSE: In a VHDL Design File (.vhd) at the specified location, you used a choice that contains the specified meta-value. Integrated Synthesis ignored this choice because it cannot synthesize logic that exactly matches the simulated behavior of the choice. In particular, VHDL simulators treat meta-values as real logic values rather than don't care values; for example, a comparison between a std_logic 1 and X results in FALSE. Therefore, Integrated Synthesis cannot treat meta-values as don't care values without creating an inherent mismatch between simulation and synthesis results.
ACTION: If you intended this behavior, no action is required. Otherwise, restructure the HDL code to remove the meta-value from the choice.
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