10.1. Resource and Planning Issues
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
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