SKEW (II)

• Negative skew is usually undesirable; it will increase the required setup time:

• If you use the global clock resources, then there should be no danger of hold-time violations for internal paths

• TRACE can check for race conditions; set env.variable XILINX_DORACECHECK to activate this (same environment variable will activate skew-checking).

Clock @ Source Register

Clock @ Destination Register

Clock skew

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