Auto Register Duplication logic option

Scripting Information

Keyword: router_register_duplication

Settings:on | off | auto

*default

A logic option that allows the Fitter to automatically duplicate registers within a lab containing empty logic cells. This option does not alter the functionality of the design. The Auto Register Duplication option is also ignored if you select OFF as the setting for the Logic Cell Insertion -- Logic Duplication logic option. Turning on this option allows the Logic Cell Insertion -- Logic Duplication logic option to improve a design's routability, but can make formal verification of a design more difficult.

This option is useful when a design is hard to fit.

This option is available for supported device (Arria® series, Cyclone® III, Cyclone® IV , MAX® II , MAX® V, and Stratix® series) families.

Important: Important: If you want to perform routing back-annotation, turn off the Logic Cell Insertion - Logic Duplication and Auto Register Duplication logic options, run the Fitter, and then back-annotate assignments.