Intel® Quartus® Prime Standard Edition User Guide: Design Optimization

ID 683230
Date 11/12/2018
Document Table of Contents

5.2.6. Hierarchical (Parent and Child) Logic Lock (Standard) Regions

To further constrain module locations, you can define a hierarchy for a group of regions by declaring parent and child regions.

The Intel® Quartus® Prime software places a child region completely within the boundaries of its parent region; a child region must be placed entirely within the boundary of its parent. Additionally, parent and child regions allow you to further improve the performance of a module by constraining nodes in the critical path of a module.

To make one Logic Lock (Standard) region a child of another Logic Lock (Standard) region, in the Logic Lock (Standard) Regions window, select the new child region and dragging the new child region into its new parent region.

Note: The Logic Lock (Standard) region hierarchy does not have to be the same as the design hierarchy.

You can create both auto-sized and fixed-sized Logic Lock (Standard) regions within a parent Logic Lock (Standard) region; however, the parent of a fixed-sized child region must also be fixed-sized. The location of a locked parent region is locked relative to the device; the location of a locked child region is locked relative to its parent region. If you change the parent’s location, the locked child’s origin changes, but maintains the same placement relative to the origin of its parent. The location of a floating child region can float within its parent. Complex region hierarchies might result in some LABs not being used, effectively increasing the resource utilization in the device. Do not create more levels of hierarchy than you need.

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