• U2-122S support two IDE (ATA/ATAPI) devices.

USB-122S (Horizontal Type) is a USB 2.0 to EIDE bridge board featuring Acer Laboratories Inc. M5621 (High-Speed USB 2.0 to ATA/ATAPI Native Bridge Controller)

The USB-122S implements a bridge between one USB 2.0 port and one ATA or ATAPI based mass storage device port. This bridge adheres to the Mass Storage Class Bulk-Only Transport specification and is intended for self-powered devices.

Hardware design allows CBW command queuing, which allows data transfer rates of up to the USB theoretical maximum. The USB port of the USB-122S is connected to a host computer directly or via the downstream port of a USB hub. Host software issues commands and data to the USB-122S and receives status and data from the USB-122S using standard USB protocol.

Built-in USB2.0-to-IDE Interface Controller with general IDE interface & bulk-only transport of USB mass storage class support industry-standard 8/16-bit PIO/DMA & Multi-word DMA and Ultra Mode DMA modes 0-4 (upto UDMA66) for storage devices as DVD/CD-ROM, CD-R/W and Harddisk device, etc.

The ATA/ATAPI interface supports The device initialization process is configurable, enabling the USB-122S to initialize most ATA/ATAPI devices without software intervention.

  • Enables quick penetration of USB 2.0 markets
  • Complete backward compatibility
  • Leverages ATA/ATAPI peripheral economies of scale
  • Supports both ATA and ATAPI devices by using the same firmware.
  • Support two IDE Devices (Master and Slave).
  • 48-bits LBA addressing (>128GB) support.
  • Allows use of existing peripheral software applications
  • Provides cost-effective solution for remote location of peripheral devices
  • User friendly interface - Plug&Play and Ease of use
  • Enables hot swappable peripherals
Technical Specifications

USB 2.0 to EIDE Bridge Board:

  • Complies with the USB-IF specifications for USB 2.0, the USB Mass Storage Class, and the USB Mass Storage Class Bulk-Only Transport
  • Operates at High (480Mbps) or Full (12Mbps) speed
  • Uses one external serial EEPROM containing the USB device serial number, vendor and product identification data, and device configuration data
  • Self Powered Mode Of Operation
  • Built-in High-performance Micro-controller Engine for interface, flow & multi-functional control
  • Support for ATA/ATAPI devices configured either as master or slave
  • ATA/ATAPI Interface Supports:
    • PIO Mode 0 ~ 4
    • Multiword DMA Mode 0 ~ 2
    • Ultra DMA Mode 0 ~ 4
    • Supports 48-bit addressing for large hard drives (>128GB).
  • Provide High Speed LED and Device Access LED
  • Operating System Support: Windows 98 SE/ Me/ 2000/ XP; MacOS 8.6 or later
  • IDE (ATA/ATAPI) Interface: There are three types of USB-122S--
    *USB-122S-M (With IDC 2X20 Male Connector)
    *USB-122S-C (With IDC 2X20 Flat Cable)
  • USB 2.0 Interface: One External USB B-type-4pin Connector
  • DC Power Input Connector: mini 4-pin FDD like Power Connector
  • DC Power Input: DC 5V/ 300mA
  • Fit to most standard SCSI Enclosure (SCSI I 50pin Connector Form Factor)
Physical Dimensions
  • 2.97" x 1.34" (7.54cm x 3.40cm)
Hardware Requirements
  • Desktop PC: with either a built-in USB (1.0 or 2.0) controller or an USB (1.0 or 2.0) to PCI Host Adapter equipped with a external USB port.
  • Laptop PC: with either a built-in USB (1.0 or 2.0) controller or an USB (1.0 or 2.0) to CardBus PC Card equipped with a external USB port.
Operating System Requirements
  • Windows 98SE/ME/2000/XP/2003; MacOS 9.1 or higher; Linux
  • Driver Requirements
    • USB:
      • No driver installation for Windows ME, 2000, XP, 2003, Mac OS and Linux.
      • Driver available for Window 98 SE

To turn your SCSI enclosure into USB 2.0 Enclose
NOTE: USB-122S is for Enclosure with Internal Power Supply.

This allows peripheral vendors a unique opportunity to continue the advantage of the ATA/ATAPI economies of scale while presenting USB-122S into the rapidly expanding USB 2.0 markets. It also can replaces the slow & expensive SCSI device with cheap & fast EIDE device. SCSI Enclosure vendors using the ATA/ATAPI devices now have an immediate and no-risk solutions for adding USB 2.0 interface to their product lines.