ID:17957 The clock buffer cannot drive the required destination ports because its mode is incompatible. The buffer must be always enabled and single-input single-output.

CAUSE: The Fitter cannot move the mandatory global destination ports to an existing clock buffer because the clock buffer is in a gated mode or otherwise not single-input single-output. The fitter cannot use clock network routing for the destinations automatically without instantiating an additional single-input single-output clock buffer at the source.

ACTION: Modify your design to instantiate a clock buffer that drives the required global destination ports if the intent is to split clock network fanout between multiple buffers with different enable modes. Alternatively, modify the existing clock buffer to be single-input single-output or remove it from the design. If the intent is to use a gated clock for all fanouts, then modify the design to drive all the destinations with the gated clock. Using local routing to route the signals, if possible, can also work around this error.