U3X4-EP4XE112E3 | Quad channel 16-port (4-port x 4) USB 3.0 to External PCI Express x4 Gen 2 Host Docking


Quad channel 16-port (4-port x 4) USB 3.0 to External PCI Express x4 Gen 2 Host Docking

Octad Channel 8-port (1-port x 8) USB 3.0 to PCI Express x8 Gen 2 Host Card


  • Host Bus: PCIe x4 Gen 2 (20.0 Gb/s)
    • Compliant with PCI Express Base Specification Revision 2.0
  • Quad independent USB 3.0 Host Controllers ( FRESCO FL1100; USB IF TID 380000026).
    • Compliant with Universal Serial Bus 3.0 specification Revision 1.0
    • Compliant with Intel’s eXtensible Host Controller Interface (xHCI) specification Revision 1.0
    • USB 3.0 Host Controller supports four downstream ports
  • Sixteen USB 3.0 Cable Ports (A-type Receptacle)
    • Provides USB 3.0 cable port lock mechanism

    USB 3.0 Standard A-type lock mechanism


The U3X4-EP4XE112E is an Quad channel 16-port (4-port x 4) USB 3.0 to External PCI Express x4 Gen 2 Host Docking

U3X4-EP4XE112E is integrated by the following four key parts (EP4X-PCIE4XG201, U3X4-EP4XG211E, CB-00485, PS-00056).

  • EP4X-PCIE4XG201 --- PCIe Cable Adapter (with PCIe to PCIe Packet Switch)
    • Upstream: 4-lane PCI Express
    • Downstream: Four 1-lane PCI Express
  • U3X4-EP4XG211E---Quad channel 16-port (4-port x 4) USB 3.0 to PCI Express x4 Gen 2 Docking
    • Integrated Quad Independent USB 3.0 to PCI Express x1 Gen 2 Host Controllers
    • Each Channel USB 3.0 has Four Cable Ports
  • CB-00485
    • External PCIe x4 Cable
  • PS-00056
    • AC to DC Power Adapter (12V/9A)

Utilizing the standard PCI Express Switch, the 8-Lane/8-Port PCI Express Switch provides the most efficient fan-out solution for integrating quad PCI Express to USB 3.0 Single Chip Host controllers into a small board design. Each USB 3.0 to PCI Express Single Chip Host controller takes advantages of 5 Gbps burst rate of 4-lane PCI Express bus in both directions and is fully compliant with PCI Express Base specification r2.0. This solution provides full PCI Express and USB 3.0 functionality and performance.

Technical Specifications

Upstream PCIe interface
  • 4-lane PCI Express
    • PCIe Gen 1 (2.5GT/s)
    • PCIe Gen 2 (5.0GT/s)
Downstream PCIe interface
  • External 4-lane PCIe Connector
    • 38pin iPass™ (0.8mm pitch) compatible I/O Connector
    • Four 1-lane PCIe
PCIe to PCIe Packet Switch Feature
  • Standards Compliant
    • PCI Express Base Specification r2.0 (Backwards compatible with PCIe r1.0a/1.1)
    • PCI Power Management Spec r1.2
    • Microsoft Vista Compliant
    • Supports Access Control Services
    • Dynamic link-width control
    • Dynamic SerDes Speed Control
  • High Performance
    • Non-blocking internal architecture
    • Full line rate on all ports
    • Cut-Thru latency: 140ns
    • Maximum Payload Size - 2,048 bytes
    • Read Pacing (intelligent bandwidth allocation)
    • Dual Cast
    • Dynamic Buffer Pool Architecture for faster credit updates
  • PCI Express Power Management
    • Link power management states: L0, L0s, L1, L2/L3 Ready, and L3 (with Vaux not supported)
    • Device power management states: D0 and D3hot
    • Active State Power Management (ASPM)
  • Quality of Service (QoS)
    • Two Virtual Channels (VC) per port
    • Eight Traffic Classes per port
    • Weighted Round-Robin Port & VC Arbitration

Lane Status LEDs

  • Blink: Gen 1 speed
  • Solid: Gen 2 speed
  • Upstream Lane Status LEDs
    • LED-Lane0: Upstream x1 Status LED
    • LED-Lane3: Upstream x4 Status LED
  • SW1-1: Non-Transparent Mode
    • OFF: Disabled NT mode (default)
  • SW1-2: Select Upstream NT Port
    • OFF: Port 1 (default)
  • SW1-3 & 4: Port Configuration Setting
    • 3-OFF & 4-ON: J1-x1, x1, x1, x1
  • SW2-1: Link Upconfigure Timer
    (For Gen 1 devices that do not ignore the Gen 2 Upconfigure bits during the Link Training sequence)
    • OFF: Disabled (default)
  • SW2-2: Dual Clocking Operation
    • OFF:Disabled (default)
  • SW2-3 & 4: CFC (100Mhz) Spread Setting
    • 3-OFF & 4-OFF: No Spread
Computer Platform Requirements Desktop computer equipped with a PCIe x4, x8, x16 slot