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Re: [Discuss-gnuradio] Make USRP run w/o SW intervention

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Make USRP run w/o SW intervention
Date: Tue, 27 Sep 2011 18:24:35 -0400
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On 09/27/2011 06:04 PM, Philip Balister wrote:

I see a couple of possibilities;

1) Use a microblaze in the fpga to control the spi bus and other control functions. (It may already use a microblaze, so update the code to do this internally, instead of taking commands from ethernet)
There's a ZPU in the FPGA--it handles some of the protocol and low-speed interfacing "goop" in the normal firmware/FPGA load. But the general "model" is that the FPGA/firmware is "dumb". It simply provides a fairly generic "peek and poke" interface over the Ethernet, with all the "smarts" in the host code. I think part of the motivation for this is that it's easier to modify host code for minor performance tweaks, etc, than doing it in the firmware/FPGA code. But one could certainly enhance the small amount of firmware that runs on the ZPU to handle all the device register initialization, etc.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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