On Dec 28 2008, 4:37 am, va...@silvtrc.org wrote:
> dajjou <swissiyous...@gmail.com> wrote:
> >Hello everybody,
> > I have no idea how to start !!  in fact i want to  use  USB JTAG
> >interface in order to communicate with my FPGA ( Virtex 4), I mean
> >using the FTD2232C instead of XILINX USB programmer.
>
> Use an USB-PHY + FPGA and some reverese-eng of the DLC protocol.

Or use the JTAGkey from http://www.amontec.com as design example.

dajjou <swissiyoussef@gmail.com> wrote:
>Hello everybody,

> I have no idea how to start !!  in fact i want to  use  USB JTAG
>interface in order to communicate with my FPGA ( Virtex 4), I mean
>using the FTD2232C instead of XILINX USB programmer.

Use an USB-PHY + FPGA and some reverese-eng of the DLC protocol.

dajjou <swissiyoussef@gmail.com> wrote:
> Hello everybody,

>  I have no idea how to start !!  in fact i want to  use  USB JTAG
> interface in order to communicate with my FPGA ( Virtex 4), I mean
> using the FTD2232C instead of XILINX USB programmer.

In order to use with XILINX Impact, you either have to use a DLC-5 clone or
the original  DLC-9/10, as for the USB cables the protocolls between Impact
and the programmer isn't published. For pure programming, xc3sprog at
sourceforge can be a start. I fact I use xc3sprog with a home built FT2232
adapter for programming XCF and Spartan 3.  

-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

Hello everybody,

 I have no idea how to start !!  in fact i want to  use  USB JTAG
interface in order to communicate with my FPGA ( Virtex 4), I mean
using the FTD2232C instead of XILINX USB programmer.

 please i need your help .