Kontron COMe Starterkit Eval T2 Manual do Utilizador descarregar pdf (Página 98)

COM Express Interfaces

2.11.3. Routing Considerations

Route LVDS signals as differential pairs (excluding the five single-ended support signals), with a

100-Ω differential impedance and a 55-Ω, single-ended impedance. Ideally, a LVDS pair is

routed on a single layer adjacent to a ground plane. LVDS pairs should not cross plane splits.

Keep layer transitions to a minimum. Reference LVDS pairs to a power plane if necessary. The

power plane should be well-bypassed.

Length-matching between the two lines that make up an LVDS pair (“intra-pair”) and between

different LVDS pairs (“inter-pair”) is required. Intra-pair matching is tighter than the inter-pair

matching.

All LVDS pairs should have the same environment, including the same reference plane and the

same number of vias.

LVDS routing rules are summarized in 6.5.9. 'LVDS Trace Routing Guidelines' on page 189

below.

PICMG

COM Express

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

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Kontron COMe Starterkit Eval T2 Manual do Utilizador Página 98