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Enabling SuperSpeed USB and Beyond


VL671 - USB 2.0 to USB 3.1 Gen1 Transaction Translator


VL671 is a unique High-speed USB 2.0 to Super-speed USB 3.1 Gen1 transaction translator. VL671 effectively converts USB High-speed transactions to Super-speed transactions and vice-versa. With this capability, VL671 enables USB 2.0 devices to work under a USB 3.1 downstream port which only provides Super-speed interface (no USB 2.0 capability under this USB 3.1 downstream port for specific reasons). To provide best user experience, VL671 also provides bypass mode. When the upstream port of the VL671 is connected to an USB 2.0 downstream port, the USB 2.0 signals are bypassed from the upstream port to the downstream port directly, and vice-versa.

VL671 integrates in-house Super-speed PHY and USB 2.0 PHY and employs a very powerful ARM-based 32-bit microprocessor which allows the VL671 to quickly convert transactions/protocols between USB 2.0 and USB 3.1 with minimal delay. VL671 works perfectly with a single power input from USB 5V bus to save customer BOM cost and is available on QFN 48L (6x6x0.85 mm) and QFN 40L (5x5x0.85 mm) green package. VL671 QFN 48L is pin compatible to VL670.


Block Diagram

Key Features

  • Super-Speed USB (5Gb/s) and High-Speed USB (480Mb/s)
    - Compliant to Universal Serial Bus 3.1 Specification Revision 1.0, Gen1 Mode
    - Compliant to Universal Serial Bus Specification Revision 2.0
    - Supports converting Bulk-Only Transport/Control/Interrupt/Isochronous type transaction between USB 2.0 and USB 3.1 protocol
    - Downstream port support USB 2.0 Hub
    - Integrated in-house Super-Speed USB PHY and USB 2.0 PHY
  • High Performance ARM Cortex-M3 Microprocessor
    - Powerful ARM 32-bit energy efficient processor
  • Built-in Voltage Regulators
    - 5.0V to 3.3V LDO
    - 5.0V to 1.2V switching DC-DC
  • GPIOs for Special Function Usage
    - 8 GPIOs for customer special usage
    - UART interface that shared with GPIOsC
  • Misc
    - Supports power saving mode
    - Supports external SPI flash for firmware upgrade
    - Integrated PLL with external 25MHz crystal
  • Physical
    - QFN 48L green package (6x6x0.85 mm)
    - QFN 40L green package (5x5x0.85 mm)
  • Applications
    - QFN 48L green package (6x6x0.85 mm)
  • Applications
    - Digital Signage System
    - Zero-Client
    - Industrial printer
    - Mass production system for USB products
    - HD smart video surveillance system
    - High speed data acquisition system
    - Virtual Reality HMD (head-mounted display)