P-tile Avalon® Memory-mapped Intel® FPGA IP for PCI Express* Design Example User Guide

ID 683853
Date 3/28/2022
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2.1.2. Avalon-MM Address to PCIe Address Mapping

The Bursting Slave module transforms read and write transactions on its Avalon® -MM interface into PCIe memory read (MRd) and memory write (MWr) request packets. The Bursting Slave uses the Avalon® -MM address provided on its 64-bit wide address bus directly as the PCIe address in the TLPs that it creates.

The Bursting Slave, with its 64-bit address bus, uses up the whole Avalon® -MM address space and prevents other slaves from being connected to the same bus. In many cases, the user application only needs to access a few relatively small regions of the PCIe address space, and would prefer to dedicate a smaller address space to the Bursting Slave to be able to connect to other slaves.