ID 683171
Date 7/26/2022
Public

## 9.15.1. Logical Lane Assignment Restriction

If you are using ×6 or ×N bonding, transceiver dynamic reconfiguration requires that you assign the starting channel number.

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>"