Re: [Discuss-gnuradio] USRP B200 host BW with USB 3.0/2.0

[Ralph A. Schmid, dk5ras]

I understand his question that he just wants to let the whole thing pump out
samples, and he takes only a portion of it. I have no idea if this works in
a controlled manner, but at least for spectrum display this works just fine,
the lost samples are not a big issue.

Ralph.

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of
> Martin Braun
> Sent: Thursday, January 29, 2015 2:08 PM
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] USRP B200 host BW with USB 3.0/2.0
> 
> On 01/29/2015 01:48 PM, Jorge Gallo wrote:
> > I understand the given values of host bandwidth for each protocol:
> >
> > USB 2.0                  8 (MS/s @ 16-bit I/Q)
> 
> If you go down to 8-bit I&Q, you will get twice that amount, if that's
> any help.
> 
> > USB 3.0                61.44 (MS/s @ 16-bit I/Q)
> >
> >
> >
> > However I would like to process 40MHz of analogue BW in GNURadio over
> > USB 2.0
> >
> >
> > I fully understand  a continuous reception is not possible to manage
> > since it would require 40 IQ MS/s and I am limited to 8MS/s.
> >
> >
> >
> > However, is it possible to take snapshots of 40MHz over the time so that
> > I am able to receive bits of 40MHz with USB 2.0 which are not continuous
> > in time?
> >
> > Are there buffers in the FPGA that manage this kind of operation?
> 
> None big enough for anything useful.
> 
> It seems like attaching a USB3.0 connector would be simpler than running
> 5 USRPs? Not that I would complain about the sales :)
> 
> M
> 
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