U31-PCIE2XG322 | 2 port USB 3.1 to PCI Express x4 (x2 mode) Gen 3 Host Card | Asmedia ASM3142


2 port USB 3.2 Gen 2x1 (10Gbps) to PCI Express x4 (x2 mode) Gen 3 Host Card

2 port USB 3.1 to PCI Express x4 (x2 mode) Gen 3 Host Card


  • Host Bus: PCIe x4 (x2 mode) Gen 3 ; Low Profile PCI Form Factor
    • Compliant with PCI Express Base Specification Revision 3.0
  • 2-port USB 3.1 Host Controller (Asmedia ASM3142, USB IF TID 5080000010) for 43U31-PCIE2XG322 (Rev 1.2.0)
    • Compliant with Universal Serial Bus 3.1 specification Revision 1.0
    • Compliant with Intel’s eXtensible Host Controller Interface (xHCI) specification Revision 1.1
    • Support Multiple INs function
      • It improves the efficiency of the data transfer on its USB port, when host connecting to USB 3.1 Gen2 Hub with several USB 3.1 Gen1 devic
  • The Vbus of each USB Port has a 2.0A Single Channel Current-Limited Power Switch for protection
    • 2.0A (70mΩ on-resistance) Single Channel Current-limited Power Switch
    • UL File Number E322375
  • Provides USB 3.0 Vision Standard cable port lock mechanism


U31-PCIE2XG322 is a 2-port USB 3.1 Gen-II (10Gbps) to PCI Express x4 (x2 mode) Gen 3 Host Card.

U31-PCIE2XG322 is designed with the new generation Universal Serial Bus XHCI host controller, bridging PCI Express to USB3.1 Gen-II, compliant with USB 3.1 Specification Revision 1.0 and Intel eXtensible Hot Controller Interface specification revision 1.1.

U31-PCIE2XG322 (Rev 1.2.0) also supports the new feature of USB 3.1 Gen2, named Multiple INs to achieve fully utilization rate of 10Gbps data rate, tacking advantage of the available bandwidth of USB3.1 Gen2 bus.

U31-PCIE2XG322 supports two USB 3.1 Gen-II (10Gbps) ports and perform trusting high speed bandwidth with PCIe Gen-III x2 supporting. It also supports backward compatible with legacy USB function and devices, compliant with UASP (USB Attach SCSI Protocol) Revision 1.0, supporting the XHCI debug capability.

Technical Specifications

PCIe Host Bus
  • Support PCI Express x1 Gen 3
  • Up to 10Gbps bandwidth performance with low latency
  • Support PCI Express Link power management
  • Compliant with PCI Express Base 3.0 Specification
  • Compliant with PCI Express card Electromechanical 2.0 specification
  • Compliant with PCI Express Mini Card Electromechanical 1.2 specification
  • Compliant with Express Card Standard Revision 2.0
  • Compliant with PCI Bus Power Management Interface Specification Revision 1.2
  • Compliant with PCI Local Bus Specification Revision 3.0
  • Support overclocking capability on PCI Express interface
USB Features
  • Support two ports of USB 3.1
  • Up to USB3.1 Gen-II 10Gbps
  • Compliant with Universal Serial Bus 3.1 Specification Revision 1.0
  • Compliant with Universal Serial Bus Specification Revision 2.0
  • Compliant with USB Attached SCSI Protocol Revision 1.0
  • Support Multiple INs function for 43U31-PCIE2XG322 (Rev 1.2.0)
  • Support USB3.1 and USB2.0 Link Power Management
  • Support Control, Bulk, Stream, Interrupt, Isochronous transfer type
  • Support independent port power control
  • Support overcurrent detection
  • Support Remote/Wakeup event
  • Integrate Spread Spectrum Controller for USB3.1 interface
  • Backward compatible with Legacy USB function and device
  • Support the Debugport
Number of USB Ports Two USB 3.1 Cable Ports (A-type Receptacle, USB IF TID 360000145)
USB3 cable lock mechanism
  • Provides the threaded holes for the jack-screws of USB 3.1 A Plug w/Jackscrew lock Cable

USB Bus Power Input

U31-PCIE2XG322-10: USB bus power is from PCIe 12V (Step-Down)

U31-PCIE2XG322-13: USB bus power may from the following source (A or B): 

  • A. From PCIe 12V (Step-Down)
  • B. From Power Connector (IDE 4-pin or SATA 15-pin)

Available Models

Without Power Connector
With Power Connectors