Hello Lijian,
Sure! I've gone ahead and attached the lower_freq.m
file to this email. When you open up and look through the lower_freq.m
file you'll find that it goes into
XPS_ROACH_base/pcores/adc_interface_v1_01_a/hdl/vhdl/adc_interface.vhd
and changes all of the instances of 'HIGH' to 'LOW' (there are four, I
think).
Run the bee_xps compilation up to the 'Copy Base
Package' step, use lower_freq.m to change the proper parameters or
change them manually, and then go back and finish the rest of the
compilation steps using bee_xps.
Hope this helped!
-Louis P. Dartez
Arecibo Remote Command Center Scholar
Center for Advanced Radio Astronomy Researcher
Department of Physics and Astronomy
University of Texas at Brownsville
On 08/16/2012 04:35 AM, 李健(lijian) wrote:
Hi,louis
I had meet the same question as you!
can you give me "lower_freq.m" file. and show me how to use it!
thanks!
Li Jian
------------------------------------------------------------------------
------------------------------------------------------------
lijian
李健
Xinjiang Astronomical Observatory, CAS
中国科学院新疆天文台
150, Science 1-Street
Urumqi, Xinjiang, 830011
China
新疆乌鲁木齐市科学一街 150号 (邮编: 830011)
电 话: 09913689065
------------------------------------------------------------
*From:* Louis Dartez <mailto:[email protected]>
*Date:* 2012-01-24 23:30
*To:* Marco Bartolini <mailto:[email protected]>
*CC:* casper <mailto:[email protected]>
*Subject:* Re: [casper] roach & adc sampling rate
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]
<mailto:[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] <mailto:[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 <tel:%28956%29%20372-5812>
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 <tel:%2B39%20051%20696%205834> Email:
[email protected] <mailto:[email protected]>
Fax: +39 051 696 5810 <tel:%2B39%20051%20696%205810> Web:
http://www.med.ira.inaf.it
function [ return_value ] = lower_freq( basedir_name )
%LOWER_FREQ Change params to compile at lower clock freq
% Change params in vhdl base system in order to get the design compiled
% at low clock freuencies
%
% USAGE: lower_freq( basedir_name )
if ~isdir(basedir_name)
disp(['Cannot find directory: ' basedir_name]);
return_value = 0;
return;
end
vhdl_path = [basedir_name '/XPS_ROACH_base/pcores/adc_interface_v1_01_a/hdl/vhdl/'];
if ~isdir(vhdl_path)
disp(['Cannot find directory: ' vhdl_path]);
disp('Compile desigin up to \"Copy base package\" in bee_xps');
return_value = 0;
return;
end
adc_interface_path = [vhdl_path 'adc_interface.vhd'];
orig_file = fopen(adc_interface_path, 'rt');
if orig_file <= 0
disp(['Cannot open file: ' adc_interface_path]);
return_value = 0;
return;
end
temp_path = [pwd() '/vhdtmp.vhd'];
tmp_file = fopen(temp_path, 'w+t');
if tmp_file <= 0
disp(['Cannot open file: ' temp_path ' for writing']);
return_value = 0;
return;
end
tline = fgetl(orig_file);
while ischar(tline)
for o = strfind(tline, 'HIGH')
disp([tline ' -> ' num2str(o)]);
tline = strrep(tline, 'HIGH', 'LOW');
disp(tline);
end
fwrite(tmp_file, tline);
fprintf(tmp_file, '\n');
tline = fgetl(orig_file);
end
fclose('all');
movefile(temp_path, adc_interface_path);
return_value = 1;
return;
