Intel® Hyperflex™ Architecture High-Performance Design Handbook

ID 683353
Date 10/04/2021
Public

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2.2.2.1. Localized Clock Enable

The localized clock enable has a small fan-out. The localized clock enable often occurs in a clocked process or an always block. In these cases, the signal’s behavior is undefined under a particular branch of a conditional case or if statement. As a result, the signal retains its previous value, which is a clock enable.

To check whether a design has clock enables, view the Fitter Report > Plan Stage > Control Signals Compilation report and check the Usage column. Because the localized clock enable has a small fan-out, retiming is easy and usually does not cause any timing issues.