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90 Intel

Atom™ processor CE4100 Ref# 420826

Platform Design Guide

Intel Confidential

8.1.1.1 Serial ATA Trace Separation

Use the following separation guidelines for the SATA interface. Figure 8-2 provides an

illustration of the recommended trace spacing.

• Maintain parallelism between SATA differential signals with the trace spacing needed to

achieve 100-Ω ± 10% differential impedance. Deviations will normally occur due to

package breakout and routing to connector pins. Ensure that the amount and length of

the deviations are kept to the minimum possible.

• Use an impedance calculator to determine the trace width and spacing required for the

specific board stack-up being used, keeping in mind that the target is a 100 Ω ±10%

differential impedance.

• Based on simulation data, use 21-mil minimum spacing between Serial ATA signal pairs,

and use other signal traces for optimal signal quality. This helps to prevent crosstalk.

Figure 8-2. Illustration of Serial ATA Trace Spacing

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