9.15.1. Logical Lane Assignment Restriction
Transceiver dynamic reconfiguration requires that you assign the starting channel number. For PCIe ×8 configurations, logical channel 0 must be assigned to either physical transceiver channel 1 or channel 4 of a transceiver bank. For PCIe x4 configurations, logical channel 1 must be assigned to either physical transceiver channel 1 or channel 4 of a transceiver bank. However, if you have already created a PCB with a different lane assignment for PCIe ×8 logical lane 0 or PCIe ×4 logical lane 1, you can use the workaound shown in the example below to remove this restriction; the example redefines the pma_bonding_master parameter using the Intel® Quartus® Prime Assignment Editor. In this example, the pma_bonding_master was originally assigned to physical channel 1. (The original assignment could also have been to physical channel 4.) The to parameter reassigns the pma_bonding_master to the PHY IP Core for PCI Express (PIPE) instance name. You must substitute the instance name from your design for the instance name shown in quotation marks
Overriding Logical Channel 0 Channel Assignment Restrictions in Stratix V Devices for ×6 or ×N Bonding
set_parameter -name pma_bonding_master "\"1\"" -to "<PHY IP instance name>"
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