is it possible to design usb only with fpga?

[rat]

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

 

[jtw]

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

"rat" <rattt@col.edu.cn> wrote in message
news:c7kjvf$2l0m$1@mail.cn99.com...

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

 

[Antonio Pasini]

Is it possible to make a USB 1.1 interface only with FPGA chip, I mean,
without addtional transceiver chip?

Have a look to http://member.nifty.ne.jp/fpga/freeip/usb/index.html.

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 ...

 

[Symon]

Antonio,
Try http://babelfish.altavista.com/ and stick the URL in the Website
translate bit. No Japanese to Italian, but is English OK?
cheers, Syms.

"Antonio Pasini" <NOSPAM_pasini.a@tin.it> wrote in message
news:Sm9oc.239685$rM4.10253575@news4.tin.it...

Now, if I just learnt japanese at school ...

 

[Chuck McManis]

"rat" <rattt@col.edu.cn> wrote in message
news:c7kjvf$2l0m$1@mail.cn99.com...

Hi,
Is it possible to make a USB 1.1 interface only with FPGA chip, I mean,
without addtional transceiver chip?

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