Advantech AIMB-218 Series User Manual page 69

M.2 B-key slot
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PCIE x1/M.2 B-Key slot [Enabled]
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Controls the PCIE x1/M.2 B-Key Root Port.
ASPM [Auto]

Sets the ASPM Level: Force L0s - Force all links to L0s State: AUTO - BIOS.
auto configure: DISABLE - Disables ASPM.
L1 Substates PCI Express L1 Substates settings [L1.1 & L1.2]

PCIe Speed [Auto]

Selects M.2 B-Key port speed.
59 AIMB-218 User Manual