External Memory Interface Handbook Volume 2: Design Guidelines

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

6.2.2. Input to the FPGA from the QDR II SRAM Component

The QDR II SRAM component drives the following input signals into the FPGA:
  • read data
  • echo clocks, CQ/CQ#

For point-to-point signals, Intel recommends that you use the FPGA parallel OCT wherever possible. For devices that do not support parallel OCT (Arria II GX), and for ×36 emulated configuration CQ/CQ# termination, Intel recommends that you use a fly-by 50-ohm parallel termination to VTT. Although not recommended, you can use parallel termination with a short stub of less that 50 ps propagation delay as an alternative option. The input echo clocks, CQ and CQ# must not use a differential termination.

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