External Memory Interface Handbook Volume 2: Design Guidelines

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ID 683385
Date 5/08/2017
Public
Document Table of Contents

10.1.3. Specific PLL Resources

When only a single interface resides on one side or one quadrant of a device, PLL resources are typically not an issue. However if multiple interfaces or IP are required on a single side or quadrant, consider the specific PLL used by each IP, and the sharing of any PLL resources.

The Quartus Prime software automerges PLL resources, but not for any dynamically controlled PLL components. Use the following PLL resource rules:

  • Ensure that the PLL located in the same bank or side of the device is available for your memory controller.
  • If multiple PLLs are required for multiple controllers that cannot be shared, ensure that enough PLL resources are available within each quadrant to support your interface number requirements.
  • Try to limit multiple interfaces to a single quadrant. For example, if two complete same size interfaces can fit on a single side of the device, constrain one interface entirely in one bank of that side, and the other controller in the other bank.

For more information about using multiple PHYs or controllers, refer to the design tutorials on the List of designs using Intel® External Memory IP page of www.alterawiki.com.

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