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Ref design speeds USB interface development

Posted: 10 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:embedded USB host controller? USB mass storage interface? USB flash disk?

Vinculum VF2F2 reference design module from FTDI

Future Technology Devices International Ltd (FTDI) has announced the availability of the VF2F2 reference design module for its Vinculum VNC1L embedded USB host controller.

The design incorporates a practical firmware application that demonstrates file transfer using the USB mass storage class interface. It permits moving files from a USB device, such as a digital camera, to a USB flash disk. The design could also be used to transfer files between other mass storage class devices such as MP3 players or between two USB flash disks.

Module features
The module is equipped with two USB type A sockets and four control buttons. An onboard DC/DC converter provides 5V and 3.3V supply from the attached battery pack that holds 2x AAA cells. Four LEDs provide indication of flash disk enumeration, file copy, power and error conditions.

The VNC1L IC provides all USB host interface and data transfer functions in addition to encapsulating the USB device classes. It also manages the file allocation table (FAT) structure by use of a straightforward command set. Vinculum is based around a unique 8bit processor as the controller. A 32bit co-processor provides file system calculations and two DMA engines handle data transfers.

Embedded memory
The device contains 64Kbytes of embedded flash program memory and 4Kbytes of internal data SRAM. Programming of its 8bit core is by an easy-to-use, high-level assembly language that typically produces code half the size of other similar controllers. The VNC1L is specifically targeted at embedded USB controller applications. The single, low-power IC requires just a crystal and a few passive components to bring USB connectivity to a wide range of devices that previously did not have the capability.

The VF2F2 is supplied fully assembled together with schematics, firmware and PCB gerber files. They are also available for download from the Vinculum Website.

The VF2F2 Vinculum reference design is available at $35 for single-unit quantities.




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