External Memory Interface Handbook Volume 2: Design Guidelines

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

10.6.6. Operate at a Lower Speed

Test the interface at a lower speed. If the interface works at a lower speed, the interface is correctly pinned out and functional.

If the interface fails at a lower speed, determine if the test is valid. Many high-speed memory components have a minimal operating frequency, or require subtly different configurations when operating at a lower speeds.

For example, DDR, DDR2, or DDR3 SDRAM typically requires modification to the following parameters if you want to operate the interface at lower speeds:

  • tMRD
  • tWTR
  • CAS latency and CAS write latency

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