Sir,
VDIP2 is the module of FTDI which enables it to be connected to USB two flash drives. I am using an Atmega 16 development board. The module is shipped as a blank device and hence needs to be loaded with its firmware. I am using VDFC firmware available on the FTDI website.Here is the link of VDIP2 datasheet:- http://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_VDIP2.pdf.
The module has two LED's to indicate whether a device is connected or not...