External Memory Interface Handbook Volume 2: Design Guidelines

ID 683385
Date 5/08/2017
Document Table of Contents Write Leveling9. Write Leveling

In DDR3 SDRAM and DDR4 SDRAM interfaces, write leveling details the margin for the DQS strobe with respect to CK/CK# at the memory side.

The TimeQuest Timing Analyzer analyzes the write leveling timing path through an equation which considers memory calibration, calibration uncertainty and PVT variation as shown in the following figure.

Figure 80. Write Leveling Timing Analysis

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