Kontron COMe Starterkit Eval T2 Manuel d'utilisateur télécharger pdf (Page 90)

COM Express Interfaces

2.10.3. Routing Considerations

Route SATA signals as differential pairs, with a 85 Ω differential impedance and a 50 Ω, 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. SATA routing

rules are also summarized in Section 6.5.8. 'Serial ATA Trace Routing Guidelines' on page 188.

As of the writing of this document, experience with SATA Gen3 implementations has shown that

Carrier Board redrivers on the TX/RX pairs may be necessary. Check with your Module provider

for further recommendations. Redrivers are available from vendors such as Texas Instruments,

Pericom and others. The TI SN75LVCP600S is a redriver part in use by some Module vendors.

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

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Kontron COMe Starterkit Eval T2 Manuel d'utilisateur Page 90