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Re: [Discuss-gnuradio] User experience with E1x0 boards

From: Philip Balister
Subject: Re: [Discuss-gnuradio] User experience with E1x0 boards
Date: Fri, 22 Apr 2011 18:29:11 -0400
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On 04/22/2011 06:00 PM, Almohanad Fayez wrote:

I haven't worked with the E100 per se but I've worked with the Beagleboard + 
USRP1 which is the same thing except the E100 uses SPI to communicate with the 
processor versus USB.  So I've done work on integrating the OMAP3530 DSP with 
the GPP within GNU Radio.  I feel that the use of the DSP is a MUST to make the 
most out of the E100 and with my Beagleboard + USRP setup I was able to run 
some FM flowgraphs but one of my bottlenecks was the USB USRP interface which 
the E100 would definitely fix.

Al points are good, except the E100 uses the GPMC bus to communicate with the FPGA. 16 bit wide data bus instead of 1 :)


Basically with the E100 I feel that you need to get your hands "dirty" where 
you might need to rewrite some GNU Radio components to make use of the NEOS coprocessor, 
which Philip Balister has done some good work in that respect, and you would also need to 
make use of the C64x+ DSP which I can point you to the source code I've developed.

The E100 has a lot of untapped potential at the moment and I hope to see more 
momentum in working with the NEOS and DSP which is what I'm focusing on and 
willing to help people to get started on.

al fayez

-----Original Message-----
From: Colby Boyer<address@hidden>
To: GNU Radio Discussion<address@hidden>
Sent: Fri, Apr 22, 2011 5:43 pm
Subject: [Discuss-gnuradio] User experience with E1x0 boards

Hi All,
My lab is interested in purchasing some USRPs. It is pretty settled
hat some of the boards will be the N2x0 series, but I am interested
o hear from people who have used the E1x0 boards. From what I can
ell, the E1x0 board should have better latency performance than the
2x0 and should have a better interface with the FPGA (GPIO pins);
lso, it has an onboard DSP. It seems that the latency would be the
ain motivation for the product, from an experimental point of view.
Has anyone tried integrating processing on the FPGA and DSP to get
etter latency results? Your thoughts on the board versus the N2x0?
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