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Re: [Discuss-gnuradio] Beagleboard

From: Nikhil Adnani
Subject: Re: [Discuss-gnuradio] Beagleboard
Date: Mon, 04 Aug 2008 19:30:09 -0400
User-agent: Thunderbird (Windows/20080708)

Eric A. Cottrell 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
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!


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).

We had also wanted a board that was optimized for wideband signal
reception, processing and analysis.  So we designed and built one with an
RF front-end and ADC to support 85MHz bandwidth, and an FPGA for
agile radio control and additional on-board processing. The radio receiver is designed for high P1dB, low noise figure and hence large operating amplitude range. We've currently got two flavors: 2.4GHz and 1.9GHz.

The intended applications for our system are network-based, distributed spectral & signal analysis. In general it's useful for wideband test & measurement applications. The system runs linux and can go fully standalone, but we've also included support for USB2.0 and Ethernet interfaces.

We'll have a few beta units available this fall, so if you're interested in details, feel free to get in touch.


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.

73 Eric

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