External clocking frequency range
Posted: Fri Oct 16, 2020 5:28 pm
Hello all,
I've seen a lot of posts about using an external clock for the ADC and associated logic, and I understand the hardware modifications that will be required, as described here: https://redpitaya.readthedocs.io/en/lat ... xtADC.html
I've seen some older posts inquiring about whether a specific frequency will work, and the answer is usually "maybe."
So, my question is, what frequencies have users tried, what ranges worked immediately, and which required further modifications?
I would like to clock the 125-14 at ~100MHz to avoid aliasing of a particular signal. It is my understanding that this will clock the ADCs directly, which will in turn clock the FPGA logic. I am not planning on using the DACs. Can I expect that the code which is currently running on the FPGA at 125MHz will behave exactly the same, just at 100 MHz instead of 125?
Will the PS-FPGA interface be affected? I am running software on the linux side which polls the FPGA BRAM registers. I'm hoping that this will not need to be altered?
I've seen a lot of posts about using an external clock for the ADC and associated logic, and I understand the hardware modifications that will be required, as described here: https://redpitaya.readthedocs.io/en/lat ... xtADC.html
I've seen some older posts inquiring about whether a specific frequency will work, and the answer is usually "maybe."
So, my question is, what frequencies have users tried, what ranges worked immediately, and which required further modifications?
I would like to clock the 125-14 at ~100MHz to avoid aliasing of a particular signal. It is my understanding that this will clock the ADCs directly, which will in turn clock the FPGA logic. I am not planning on using the DACs. Can I expect that the code which is currently running on the FPGA at 125MHz will behave exactly the same, just at 100 MHz instead of 125?
Will the PS-FPGA interface be affected? I am running software on the linux side which polls the FPGA BRAM registers. I'm hoping that this will not need to be altered?