Magma EB3600-AB User Manual - page 73
Manual is about: PCIe to PCIe Expansion
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EB3600-AB | Chapter 4 General & Technical Information
73
Display Functions of Interface card LEDs
1. Link width mode.
If the LEDs are lit solid, then it is a gen 3 link. If not the alternate display will be activated.
2. Phase equalization mode.
D400: will not be lit.
D401: Phase equalization complete.
D402: Phase 3 successful.
D403: Phase 2 successful.
D404: Phase 1 successful.
For any link below gen 3, the display will alternate between these two. A 75% on 25% off duty cycle
indicates a gen 2 link whereas a 25% on 75% off duty cycle is a gen 1 link.