COM Express Interfaces
Figure 19: PEG Lane Reversal Mode
To activate the Lane Reversal mode for the PEG Port, the COM Express specification defines an
active low signal 'PEG_LANE_RV#', which can be found on the Modules connector at row D pin
D54. This pin is strapped low on the Carrier Board to invoke Lane Reversal mode.
Note Please be aware that the SDVO lines on Type 2 Modules (Section 2.5.2) that share the PEG
Port (Section 2.4) may not support Lane Reversal mode. This is the reason that there are
“normal” (ADD2-N) and “reverse” (ADD2-R) pin-out ADD2 cards on the market. ADD2-N
cards are used in a PEG slot that does not employ lane reversal. An ADD2-R card is used
in a PEG slot that does employ lane reversal.
Check with your Module vendor to see if SDVO Lane Reversal is supported.
PICMG
®
COM Express
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Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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