Hi, Is it possible to make a USB 1.1 interface only with FPGA chip, I mean, without addtional transceiver chip? Thanks a lot!
Regards, rat
is it possible to design usb only with fpga?
May 09, 2004
4 Replies
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
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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
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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
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