External Memory Interface Handbook Volume 2: Design Guidelines: For UniPHY-based Device Families

ID 683385
Date 3/06/2023
Document Table of Contents
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10.1. Resource and Planning Issues

Typically, single stand-alone interfaces should not present Quartus Prime Fitter or timing problems.

You may find that fitter, timing, and hardware operation can sometimes become a challenge, as multiple interfaces are combined into a single project, or as the device utilization increases. In such cases, interface configuration is not the issue; rather, the placement and total device resource requirements can create problems.

Resource Issue Evaluation

External memory interfaces typically require the following resource types, which you must consider when trying to place logic manually. You might also use additional constraints to force the placement or location of external memory interface IP:

  • Dedicated IOE DQS group resources and pins
  • Dedicated DLL resources
  • Specific PLL resources
  • Specific global, regional, and dual-regional clock net resources