Specifications

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