External Memory Interface Handbook Volume 2: Design Guidelines

ID 683385
Date 5/08/2017
Document Table of Contents Reading from Memory

During read from memory, the ODT feature is turned off, thus there is no difference between using an ODT setting of 150-ohm and 75-ohm. As such, the termination scheme becomes a single parallel termination scheme (Class I) where there is an external resistor on the FPGA side and a series resistor on the memory side, as shown in the following figure.
Figure 41. Single Parallel Termination Scheme (Class I) Using External Resistor and Memory-Side Series Resistor

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