External Memory Interface Handbook Volume 2: Design Guidelines

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

3.2.3.1. FPGA Writing to Memory

In the DDR2 SDRAM, the ODT feature has two settings: 150-ohms and 75-ohms.

The recommended ODT setting for a dual DIMM configuration with one slot occupied is 150-ohm.

Note: On DDR2 SDRAM devices running at 333 MHz/667 Mbps and above, the ODT feature supports an additional setting of 50-ohm.

Refer to the respective memory decathlete for additional information about the ODT settings in DDR2 SDRAM devices.

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