[hpsdr] USB Specification

[kd5nwa]

Unless they have messed around with the FX2 firmware the 
specifications of the FX2 chips says it will work with USB 1.0 it 
will not support the 12 Mb rate but not the 1.5 Mb rate.

<  URL:http://www-corot.obspm.fr/COROT-ETC/Files/CY7C68013.pdf  >

At 12:54 PM 1/31/2007, Chris Stratton wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I would assume the possibility of getting it to work
>on USB1.1 depends on the "software" implemented more
>than the hardware built.
>
>- you would need to get USB1.1 working with the
>cypress firmware, for example starting with USRP code.
>  Presumably you could do that with any board having
>the cypress chip (USRP, a Xylo, a Digilent NEXYS, etc)
>without waiting for HPSDR boards
>
>- you would need to modify FPGA code to limit the data
>to USB1.1 plausible rates.  Again, you could probably
>do something by trying to get the USRP code working at
>a reduced rate, sending test data.  This may mean
>throttling your output dynamic range and/or sample
>rate over the designed intent of the hardware...
>
>- and of course you would need to make modifications
>in the USB interface of client software (power SDR or
>whatever you plan to use)
>
>Chris
>(the other one... ex-N1IIR)
>
>--- Chris Salinas <n0ttw at yahoo.com> wrote:
>
> > ***** High Performance Software Defined Radio
> > Discussion List *****
> >
> > > Hi Bill,
> >
> >   I'd appreciate it as I don't have the Janus/Ozy
> > hardware to make that determination. Currently I
> > don't have PCMIA slots available to put an upgrade
> > card and there are many High Performance laptops
> > that only have USB 1.1 available on the cheap.
> >
> >   Be nice to know what the limitations it may have
> > at that specification for FYI. Like I said, if I had
> > the J/O hardware I would provide the info.
> >
> >   Looking forward to the outcome,
> >   Chris N0TTW
> >
> >
> > Bill Tracey <bill at ewjt.com> wrote:
> >   Hi Chris,
> >
> > Can't say for sure if we'll run on USB 1.1 - have
> > never tried it. Our
> > intent is to support USB 2. I'll see if I can find a
> > USB 1.1 machine
> > around here and plug it in and see if we can talk to
> > it, but I don't think
> > we'll formally support USB 1.1 (as much as anything
> > is formally supported
> > with open source code).
> >
> > Cheers,
> >
> > Bill (kd5tfd)
> >
> >
> >
> >
> > ---------------------------------
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> > hotels
> > in 45,000 destinations on Yahoo! Travel to find your
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>
>
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Cecil Bayona
KD5NWA
www.qrpradio.com www.hpsdr.com

'Never argue with an idiot. They drag you down to their level then 
beat you with experience.'  


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