Layout Consideration - Emerson COM Express Carrier Design Manual

 Nets SATA0_RX+/- through SATA1_RX +/- are sourced from SATA disks and are routed to the COM
Express module SATA RX pins.
 Coupling capacitors are not needed on carrier board SATA lines. They are present on the COM
Express module.

7.3 Layout Consideration

Route SATA signals as differential pairs, with 100 ohm differential impedance and a 55 ohm, single-
ended impedance. Ideally, a SATA pair is routed on a single layer adjacent to a ground plane. SATA
pairs should not cross plane splits. Keep layer transitions to a minimum. Reference SATA pairs to a
power plane if necessary. The power plane should be quiet and well bypassed. SATA-150 routing rules
are also summarized in Section 21.3.6 Serial ATA Trace Routing Guidelines.
Page 44 of 103 COM Express Carrier Type 2
Design Guide