XpressRICH-AXI PCIe Controller IP for USB4

PCIe Controller for USB4 Hosts and Devices supporting PCIe Tunneling, with optional built-in DMA and configurable AMBA® AXI Interconnect

XpressRICH-AXITM PCIe Controller IP for USB4 is a configurable and scalable PCIe controller Soft IP designed for implementations in USB4 devices. The XpressRICH-AXI for USB4 supports the PCI Express 5.0 specification and implements the required features mandated by the USB4 Specification. The IP can be configured to support endpoint, root port, and dual-mode topologies, allowing for a variety of use models, and exposes a configurable, flexible AMBA AXI interconnect interface to the user. The provided Graphical User Interface (GUI) Wizard allows designers to tailor the IP to their exact requirements, by enabling, disabling, and adjusting a vast array of parameters. XpressRICH-AXI for USB4 enables designers to support tunneling of PCIe in USB4 Devices or Hosts for attaching PCIe devices either internally or externally. By implementing internal PCIe devices in their USB4 designs, designers can differentiate their USB4 ICs while reducing latency and power consumption.

PCI Express is a complex protocol, and customers may not always have the expertise, the resources, or the time required to meet their development schedule. Our Advanced Design Integration (ADI) team helps customers shorten their development cycle by proposing expert services in the following areas:

  • Integration of commercial and proprietary PCIe PHY IP
  • Development and validation of custom PCIe PCS layer
  • Customization of the PCIe IP to add customer-specific features
  • Generation of custom reference designs
  • Generation of custom verification environments

Check out our Integration Services page for more information on our ADI team and its capabilities


The XpressRICH-AXI controller IP for USB4 is integrated and thoroughly verified using multiple VIP for foolproof reliability. We use a combination of Avery VIP, Cadence VIP, Mentor VIP, PCIe testsuites, and a PLDA-developed verification environment to achieve optimal coverage.

Our rigorous verification process ensure customers can focus on the core of their application.


  • Internal data path size automatically scales up or down (64-, 256-, 512- bits) based on link max. speed and width for reduced gate count and optimal throughput
  • Configurable pipelining enables full speed operation on Intel and Xilinx FPGA, full support for production FPGA designs up to Gen4 x8/Gen3 x16 with same RTL code - Gen5 support pending
  • Stringent implementation of PCIe to AXI Ordering Rules and AXI to PCIe Ordering Rules guarantees AXI deadlock prevention
  • Carefully engineered AXI bridge & AXI interconnect allows full performance on AXI interfaces
  • Availability of multiple AXI Master interfaces, a key benefit for high end SSD to maximize throughput
  • Advanced Reliability, Availability, Serviceability (RAS) features include LTSSM timers override, ACK/NAK/Replay/UpdateFC timers override, unscrambled PIPE interface access, error injection on Rx and Tx paths, recovery detailed status and much more, allowing for safe and reliable deployment of IP in mission-critical SoCs
  • Optional QuickBoot mode allows for up to 4x faster link training, cutting system-level simulation time by 20%

PCI Express layer

  • Designed to the USB4 Specification v1.0
  • Follows PCIe 1.0 protocol, but can operate at any compatible speed
  • Supports the PCI-SIG Single-Root I/O Virtualization (SR-IOV) Specification
  • Supports Endpoint, Root-Port, Dual-mode configurations
  • Supports up to 64 Physical Functions (PF), 512 Virtual Functions (VF)
  • Supports AER, ECRC, ECC, MSI, MSI-X, Multi-function, crosslink, and other optional features
  • Additional optional features include LTR, L1 PM substates, etc.

AMBA AXI layer

  • Compliant with the AMBA® AXI™ Protocol Specification (AXI3, AXI4 and AXI4-Lite) and AMBA® 4 AXI4-Stream Protocol Specification
  • Supports multiple, user-selectable AXI interfaces including AXI Master, AXI Slave, AXI Stream
  • Each AXI interface data width independently configurable in 512-, 256-, 128-, and 64-bit
  • Each AXI interface can operate in a separate clock domain
  • Supported Burst types include INCR, FIXED, WRAP
  • Narrow transfers supported

Integrity and Data Encryption (IDE)

  • Implements the PCI Express IDE ECN
  • Configurable IDE engine
  • Supports x1 to x16 lanes 
  • 256-bit or 512-bit data bus for PCIe IDE
  • Supports containment and skid modes
  • Supports early MAC termination
  • Supports multi-stream
  • Utilizes high-performance AES-GCM for encryption, decryption, authentication
  • PCIe IDE TLP aggregation for 1, 2, 4, 8 TLPs
  • PCIe IDE automatic IDE prefix insertion and detection
  • PCIe IDE automatic IDE sync/fail message generation
  • PCRC calculation & validation
  • Efficient key control/refresh
  • Bypass mode

Data engines

  • Optional built-in Legacy DMA engine
    • Up to 8 DMA channels, Scatter-Gather, descriptor prefetch
    • Completion reordering, interrupt and descriptor reporting
  • Optional Address Translation tables for direct PCIe to AXI and AXI to PCIe communication

Download the product brief or request the reference manual for complete specification and additional information.

IP files​

  • Verilog RTL source code
  • Libraries for functional simulation
  • Configuration assistant GUI


PCI Express® Bus Functional Model

  • Encrypted Simulation libraries

Reference Designs

  • Synthesizable Verilog RTL source code
  • Simulation environment and test scripts
  • Synthesis project & DC constraint files (ASIC)
  • Synthesis project & constraint files for supported FPGA hardware platforms (FPGA)