ID 683385
Date 5/08/2017
Public

## 2.7.4. Spacing Guidelines

This topic provides recommendations for minimum spacing between board traces for various signal traces.

### Spacing Guidelines for DQ, DQS, and DM Traces

Maintain a minimum of 3H spacing between the edges (air-gap) of these traces. (Where H is the vertical distance to the closest return path for that particular trace.)

### Spacing Guidelines for Address and Command and Control Traces

Maintain at least 3H spacing between the edges (air-gap) of these traces. (Where H is the vertical distance to the closest return path for that particular trace.)

### Spacing Guidelines for Clock Traces

Maintain at least 5H spacing between two clock pair or a clock pair and any other memory interface trace. (Where H is the vertical distance to the closest return path for that particular trace.)