Hi dan,
I hope your reply regarding the FFT core will solve my problem. I
will try this method. Thank you so much.
Regarding the ADC calibration, I have calibrated a single 16 ADC card and
it was successful. when i try to calibrate both of them at the same time,
it is giving error.
Thank you.
Sivasankar.S
On Mon, Mar 18, 2024 at 11:59 PM 'Dan Werthimer' via
casper@lists.berkeley.edu <casper@lists.berkeley.edu> wrote:
>
>
> hi sivasankar,
>
> you are correct, the biplex fft's also have multiple inputs, but they are
> used in a different way:
> instead of multiple time samples from a single real ADC to process higher
> data rates than the FFT clock rate,
> the biplex FFT's compute two or four FFTs simultaneously.
> e.g. you can compute four independent spectra from four different ADCs.
> if you only have one spectrum you want to compute, you can connect the
> unused biplex input channels to ground.
>
> i don't know why you can't calibrate both 16 input adc boards in your
> system.
> hopefully other casperites can weigh in.
> can you calibrate board 1 by itself?
> can you calibrate board 2 by itself ?
> can you calibrate board 1, and then board 2?
> can you calibrate board 2, and then board 1 ?
>
> best wishes,
>
> dan
>
>
> On Mon, Mar 18, 2024 at 8:42 PM Sivakumar Sivasankar <
> sivasiva8...@gmail.com> wrote:
>
>> Hi dan,
>> Thank you for your immediate response. In the fft_biplex_real blocks
>> also they have at least two simultaneous input paths. So how can I split
>> the one channel ADC output stream(200MHz) into multiple paths to give it to
>> FFT block? Even if i find a method to do that, It will reduce the sampling
>> rate of the input stream no?
>>
>> I am using ROACH2 revision 2 board. It has two 16 channel ADC cards. I
>> want to calibrate both the ADC cards at the same time. That’s why I
>> mentioned as 32 channel ADC calibration.
>>
>> Thank you.
>>
>> Sivasankar.S
>>
>> On Mon, Mar 18, 2024 at 11:10 PM 'Dan Werthimer' via
>> casper@lists.berkeley.edu <casper@lists.berkeley.edu> wrote:
>>
>>>
>>> hi sivakumar,
>>>
>>> for low sample rate FFT's (where the FPGA clock = sample rate), i
>>> suggest you consider:
>>> fft_biplex_real_2x
>>> <https://casper-toolflow.readthedocs.io/en/stable/src/blockdocs/Fft_biplex_real_2x.html>
>>> (Real-sampled
>>> Biplex FFT, with Output Demuxed by 2)
>>> fft_biplex_real_4x
>>> <https://casper-toolflow.readthedocs.io/en/stable/src/blockdocs/Fft_biplex_real_4x.html>
>>> (Real-sampled
>>> Biplex FFT, with Output Demuxed by 4)
>>>
>>> the various casper FFT's are listed here:
>>> https://casper-toolflow.readthedocs.io/en/stable/blockdocumentation.html
>>>
>>> what is the 32 input ADC board you are trying to calibrate ?
>>> is this the board designed by larry dedarrio for the LWA ?
>>>
>>> best wishes,
>>>
>>> dan
>>>
>>>
>>> On Mon, Mar 18, 2024 at 7:53 PM Sivasankar <sivasiva8...@gmail.com>
>>> wrote:
>>>
>>>> Dear Caspers,
>>>> Currently I am facing an issue with 32 ADC channel calibration
>>>> with ROACH2 rev2 board. The script for 16-ADC channel calibration is
>>>> working fine and it has calibrated successfully. I have used the same
>>>> script and changed the 16 ADC design to 32 ADC channel. I have selected
>>>> adc0_clk as the User IP clock and given 230MHz. But It is giving the below
>>>> error. Can anyone please help me to debug this issue?
>>>>
>>>> Also, I want to design a FFT operation to a single channel from 16
>>>> ADC channels with a sampling rate of 200MHz. But I couldn't find any single
>>>> input path FFT cores in casper library. All the FFT cores are coming with
>>>> at least 4 simultaneous input paths with a single simultaneous input
>>>> stream. Are there any possible blocks with a single input path so that I
>>>> can do FFT(clocking with fabric clk 200MHz) to a 200MHz single channel from
>>>> the ADC output?
>>>>
>>>> Thank you in advance
>>>>
>>>> Sivasankar.S
>>>>
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