Using DesignWare IP to add a PCI Express® interface to your system-on-chip (SoC) design makes your design task considerably easier. However, if you are using a standards-based on-chip bus in your SoC, you will have to design a bridge to PCI Express from your bus requiring a fair amount of knowledge of the PCI Express standard. In building a bridge to PCI Express, a number of unique challenges await you as you map the capabilities of PCI Express on to your standard on-chip-bus. In this case study, we will walk you through the process of building a bridge from PCI Express to the industry-standard AMBA® 3 AXI™ on-chip bus.