software 
 to use I/O pin feedback whenever possible. The pin feedback path has slightly 
 shorter propagation delay than the global feedback path. If this option 
 is enabled, the software uses the pin feedback path instead of the global 
 feedback path for macrocell signals that do not drive 3-state outputs 
 or slew-rate-limited outputs, and where the associated I/O pin is not 
 used as input-only. By default, this option is on.</p>

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