Fast Output Register logic option

A logic option that implements an output register in an I/O cell that has a fast, direct connection to an I/O pin. Turning on the Fast Output Register option can help maximize I/O timing performance, for example, by permitting fast clock-to-output times. Turning off this option for a particular signal prevents the Fitter from implementing the signal automatically in an I/O cell.

This option must be assigned to a register or an output or bidirectional pin fed by a register or it is ignored.

Scripting Information

Keyword: fast_output_register

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