is it possible to design usb only with fpga?

Not if I recall correctly. There are specific rise/fall-time requirements (and I forget what else) that FPGA I/Os don't support (or at least, didn't.)

Jason T. Wright

Have a look to

I had a look to the VHDL source, and to the schematic.

He's not using any external transceiver, it seems.

Now, if I just learnt japanese at school :-)...

Antonio, Try

and stick the URL in the Website translate bit. No Japanese to Italian, but is English OK? cheers, Syms.

I don't believe so, the signalling levels and pin tolerances of the USB spec aren't supported by any FPGA vendor AFAIK. You can get tiny SMD trancievers anyway so what's the problem?

Another question would be does anyone have a HOST controller core?

--Chuck