[hpsdr] USB Specification

[Chris Stratton]

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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