Quartus® Prime Pro Edition User Guide: Power Analysis and Optimization

ID 683174
Date 4/01/2024
Document Table of Contents LAB Clock Power

Another contributor to clock power consumption are LAB clocks, which distribute clock to the registers within a LAB. LAB clock power can be the dominant contributor to overall clock power.
Figure 28. LAB-Wide Control Signals

To reduce LAB-wide clock power consumption without disabling the entire clock tree, use the LAB-wide clock enable to gate the LAB-wide clock. The Quartus® Prime software automatically promotes register-level clock enable signals to the LAB-level. A shared gated clock controls all registers within an LAB that share a common clock and clock enable. To take advantage of these clock enables, use a clock enable construct in the relevant HDL code for the registered logic.