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Enabling SuperSpeed USB and Beyond


VL715 - Super Speed Plus USB 3.1 to SATA 6Gb/s Bridge Controller


VIA Lab’s VL715 is a high performance, low power single chip USB 3.1 to SATA 6Gb/s bridge controller designed for new generation external storage devices that connecting Hard Disk Drive (HDD), Solid-State Drive (SSD), and Optical Disc Drive (ODD). Its integrated in-house USB 3.1 PHY enables VL715 to run in USB SuperSpeedPlus, Super-Speed, High-Speed, and Full-Speed modes. Supporting USB mass storage class Bulk-Only Transport (BOT), VL715 based devices can work on Windows 8, Windows 7, Vista, XP, Mac OS X and various Linux kernels without additional driver. Besides Bulk-Only Transport, VL715 also support USB Attached SCSI Protocol (UASP) that allowing mass storage command queuing and out of order data transfers to further enhance read/write performance. Its integrated in-house SATA 6Gb/s host controller can work with all SATA based storage devices and can connect at SATA 6Gb/s, SATA 3Gb/s, or SATA 1.5Gb/s automatically.

Built-in all required linear and switching voltage regulators, highly integrated VL715 work perfectly with single power input from USB 5V bus power to save customer BOM cost. 7 GPIO pins are available for push button, operation LEDs, device power down control, and other special usage. The SPI interface can support external flash for firmware upgrades or additional software enhancements. VL715 is pin to pin compatible to its predecessor VL711 which can keep using the same PCB design.

Block Diagram

Key Features

  • Super-Speed Plus USB (10Gb/s) and High-Speed USB (480Mb/s)
    - Compliant to Universal Serial Bus 3.1 Specification Revision 1.0
    - Compliant to Universal Serial Bus Specification Revision 2.0
    - Mass Storage Class Bulk-Only Transport (BOT)
    - USB Attached SCSI Protocol (UASP) for streaming
    - Integrated in-house Super-Speed PHY and USB 2.0 PHY
  • Serial ATA 6Gb/s, 3Gb/s and 1.5Gb/s
    - Compliant to Serial ATA Specification Revision 3.1
    - Integrated in-house SATA 6Gb/s PHY
    - RBC command conversion for ATA device
    - MMC-2 command pass-through to ATAPI
    - Support 48-bit LBA
    - Support multiple LUN
  • Fast 8051 Macro cell 80C32-Compatible Microcontroller
    - Standard 1T 8051 instruction set
  • Built-in Voltage Regulators
    - 5.0V to 3.3V LDO
    - 5.0V to 1.2V switching DC-DC 
  • GPIOs for Special Function Usage
    - 7 GPIOs in QFN48 and QFN44 for customer special usage
    - 2 dedicated BUSY/POWER LED indicators
  • Misc
    - Support device power down function
    - Support external SPI flash for firmware upgrade
  • Software
    - Support Microsoft Windows 8,Windows 7, Vista, and XP
    - Support Mac OS 10.X
    - Support various Linux kernels