Advantech MMP3-21 Manual de usuario Pagina 69

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Advantech SOM-Express Design Guide
Chapter 5 Carrier Board Design Guidelines 69
1. Differential Impedance: The differential impedance should be 100 #. The
single ended trace impedance will be approximately 50 #; however, the
differential impedance can also be affected by the spacing between the
traces.
2. Trace Symmetry: Differential pairs should be routed with consistent
separation and with exactly the same lengths and physical dimensions (for
example, width).
Distance B: SOM-Express to Transformer (Priority 2)
Distance B from Figure 5-34 should also be designed to extend as short as possible
between devices, be sure not to go over 2.5 inches. The high-speed nature of the
signals propagating through these traces requires that the distances between these
components be closely observed.
SOM-
Express
GBE_MDI[0]+
LAN Connector
GBE_MDI[0]-
RJ45
Magnetic
Module
(Transformer)
B:2.5 inches max
A:1 inches max
.
.
.
GBE_MDI[3]-
GBE_MDI[3]+
Figure 5-34 Critical Dimensions
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