Hello Glenn, Marco,
Thank you for your quick replies. I'll be stopping by the lab this
afternoon to give your suggestions and try.
Glenn: I'll look around for the DCM/MMCM configurations and I'll let
you know where I find them if I do.
Marco: thank you for the m file. I haven't looked at it just yet but
I'll give it a try when I get to the lab.
I appreciate your help.
--Louis P. Dartez
On Jan 24, 2012 8:53 AM, "Marco Bartolini" <[email protected]>
wrote:
> 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
>
>
>
>
> 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
>
>
>
