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Re: [Discuss-gnuradio] Beagleboard

From: Philip Balister
Subject: Re: [Discuss-gnuradio] Beagleboard
Date: Tue, 5 Aug 2008 09:58:31 -0400

On Sun, Aug 3, 2008 at 3:32 PM, Eric A. Cottrell <address@hidden> wrote:
> Philip Balister wrote:
>> On Fri, Aug 1, 2008 at 6:31 PM, Eric Brombaugh <address@hidden>
>> wrote:
>>> On Aug 1, 2008, at 1:58 PM, Philip Balister wrote:
>>>> I've been talking to a friend (he knows FPGA stuff much better than
>>>> me) about using the expansion port to communicate with an FPGA via a
>>>> SDIO interface. I don't think we can beat the current USRP data rate,
>>>> but we should be able to reduce the latency introduced by the USB
>>>> interface.
>>> Looks like the SDIO ports run up to 50MHz and have 8-bit wide data. No
>>> idea
>>> how much overhead there is in that, but it might be able to go a bit
>>> faster
>>> than USB2.0 and as you note would have a lot less latency. Hook up to a
>>> decent FPGA and you could cram a bit of external pre-processing in as
>>> well.
>>> I picked up one of the Avnet Xilinx Spartan 3A boards for $50 that would
>>> probably work well for that.
>> We are hoping to create a board with a reasonable FPGA that works with
>> existing USRP daughterboards. This would make a really neat system for
>> small SDR nodes. I'll be sure to keep you updated on out progress.
>> Using an existing dev board for developing the beagle to FPGA
>> interface is a really good idea, thanks for suggesting it!
>> Philip
> Hello,
> Since I have some receive only applications I would like to see a box that
> took one RX or a RX/TX set of USRP daughterboard(s).
> The OMAP has some interesting interfaces and I wonder if some of them could
> be adapted for a more general I/O use.  I am more familiar with the earlier
> versions of the OMAP.  It will be nice to use the DSP for some signal blocks
> and use the ARM for more general UI and I/O blocks.

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