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Note

Merging a register into the pad (DFR using instead of DFF) can be rejected for one of the following reasons:

  1. Context issue: DFR cannot be initialized

  2. Type issue: DFR can get a RESET but not a SET (Medium/Large only)

  3. Fanout issue: Pad signal cannot be used directly (BFR) and through a pad register (DFR)

  4. Tristate issue: Inconsistency between control and data signals

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