220.127.116.11. Hyper-Register Locations Not Available
The Fitter may place the elements in a critical chain segment very close together, or route them such that there are no Hyper-Register locations available. When all Hyper-Register locations in a critical chain segment are in use, there are no more locations available for further optimization.
In Figure 106, the short path includes two Hyper-Register locations that are in use. One or more names in the Element column end in _dff, indicating that the Hyper-Registers in those locations are in use. The _dff represents the D flop-flop. No other Hyper-Register locations are available for use in that chain segment. Available Hyper-Register locations indicate status with a bypassed Hyper-Register entry in the Register column.
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