External Memory Interface Handbook Volume 2: Design Guidelines

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

2.4.4. On-Chip Termination Recommendations for DDR3 and DDR4 on Arria 10 Devices

  • Output mode (drive strength) for Address/Command/Clock and Data Signals: Depending upon the I/O standard that you have selected, you would have a range of selections expressed in terms of ohms or miliamps. A value of 34 to 40 ohms or 12 mA is a good starting point for output mode drive strength.
  • Input mode (parallel termination) for Data and Data Strobe signals: A value of 40 or 60 ohms is a good starting point for FPGA side input termination.

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