R-tile Avalon® Streaming Intel® FPGA IP for PCI Express* Design Example User Guide
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2.4.2. Configuration Space Bus and Device Numbering
Enumeration assigns the Root Port interface device number 0 on internal bus number 0. Use the ebfm_cfg_rp_ep procedure to assign the Endpoint to any device number on any bus number (greater than 0). The specified bus number is the secondary bus in the Root Port Configuration Space.