Xilinx 9.1i Warning Route:455 - CLK Net:u0/q<17>

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cyboman

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i have synthesized a very simple sequential circuit for an FPGA. i burned it and it worked fine but for some reason during implementation i got the following warning:

Route:455 - CLK Net:u0/q<17> may have excessive skew because
1 CLK pins and 1 NON_CLK pins failed to route using a CLK template.

can anyone explain what does it mean? should i be worried? and if i should then how this can be avoided in the future?

any help is appreciated.
 

Generate an advanced timing report and analyze it for timing violations, especially hold violations. The clock report will also give you some hints. You may have to eventually specify timing constraints.

If you are able to, then post your code.
 

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