External Memory Interface Handbook Volume 2: Design Guidelines

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

7.4.3.11. x4 Mode for Arria 10 External Memory Interface7.4.4.11. x4 Mode for Arria 10 External Memory Interface

Non-HPS Arria 10 external memory interfaces support DQ pins-per-DQS group-of-4 (x4 mode) for DDR3 and DDR4 memory protocols.

The following restrictions apply to the use of x4 mode:

  • The total interface width is limited to 72 bits.
  • You must disable the Enable DM pins option.
  • For DDR4, you must disable the DBI option.
Note: x4 mode is not available for Arria 10 EMIF IP for HPS.

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