Board Design Recommendations
Microsemi Proprietary and Confidential UG0677 User Guide Revision 9.0 129
8.3.1 Unused Transceiver Pins
If the transceiver interface is not used in the design, the transceiver pins must be connected as defined in
the related PolarFire Package Pin Assignment Table (PPAT).
8.4 Transceivers Insertion Loss
The following table lists the type of insertion loss.
Note: For FR-4 and good quality connectors, the insertion Loss is ~0.5 dB per inch at 5 GHz and each
connector is ~2.5 dB per connector at 5 GHz
Note: Medium reach backplane is meant for an 18” backplane with two 3” length line-card traces.
Note: Long reach backplane is meant for a 34” backplane with two 3” line card traces.
Note: DFE Equalization mode is not supported at < 3 Gb/s (rates from 3 Gb/s to 5 Gb/s, including PCI-Express,
could be supported with DFE but are not set up to do so in this RX_PRESETS table).
Table 40 • Transceivers Insertion Loss
Type Trace Distance Insertion Loss PCB length Di-Electric material
Trace width and
Spacing
Short Connections within
a board or via one
connector to a
daughter card
6.5 dB at 5 GHz 8 inches strip-line Nelco FR-4 trace width = 7mil,
space between the
P to N signal = 10mil
material
Medium Backplane
application with 2
connectors
17.0 dB at 5 GHz 24 inches strip-line Nelco FR-4 trace width = 7mil,
space between the
P to N signal = 10mil
material
Long Backplane
application with 2
connectors
25.0 dB at 5 GHz 40 inches strip-line Nelco FR-4 trace width = 7mil,
space between the
P to N signal = 10mil
material
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