| Hi Louis, I had your same problem some time ago. I had written a matlab function "lower_freq.m" that you can find attached, the code should be self explanatory ... and i don't remember the details basically you should compile your design with bee_xps up to "Copy base package", invoke lower_freq on the target directory, and terminate the bof file generation with bee_xps.
hope it helps Marco
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lower_freq.m
Description: Binary data
Il giorno 23/gen/2012, alle ore 23.57, G Jones ha scritto: Hi Louis,
The problem is probably that the DCM/MMCM has various configuration parameters which have default values for the clock speeds most commonly used for CASPER designs. To run at lower speeds, you'll need to tweak these values. I thought they can be found in the XPS_ROACH_base/data/system.ucf file that is generated for your design, but I'm not seeing it there right now. Perhaps someone else can guide you to the location of the parameters if you don't find them first.
Glenn
On Mon, Jan 23, 2012 at 2:46 PM, Louis Dartez <[email protected]> wrote:
Hello fellow CASPERites,
I've been trying to modify the wideband spectrometer tutorial to have the MSSGE block clock rate set to 50 MHz and, following the 4 to 1 rule, the ADC running at 200 MHz. Simulink complains about timing errors when I try to do this. Is there another parameter that I'm forgetting about and need to change? Or is there some lower limit for the ROACH clock rate? I figured that as long as the adc is clocked at 4x the roach rate then I should be able to lower both of them as long as I keep them at the same ratio.
Any thoughts?
--
-- Louis Dartez
(956) 372-5812
Arecibo Remote Command Center Scholar
Center for Advanced Radio Astronomy
University of Texas at Brownsville
-- Dr. Marco Bartolini I.N.A.F. - I.R.A. National Institute for AstroPhysics - Institute of RadioAstronomy Medicina Radiotelescopes Via Fiorentina, 3508/B 40059 - Medicina (BO) - Italy Phone: +39 051 696 5834 Email: [email protected]Fax: +39 051 696 5810 Web: http://www.med.ira.inaf.it
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