DigitalDiscovery relation between DIN sampling rate and system frequency

[Roche]

Hello,

The link below explains how to adjust the system frequency, which is by default 100MHz on the DigitalDiscovery. I am capturing data using the Logic Analyzer at a rate of 800MHz. If I configure the system frequency to 50MHz, I have a suspicion that the sampling rate is reduced to 400MHz. Is there such a relationship between the system frequency and the DIN samlping rate?

I am using the WaveFormsSDK v3.22.1, calling the dwf.dll via MATLAB.

 

Thank you!

Edited April 17 by Roche
Add details about software version.

[attila]

Hi @Roche

The frequency adjustment is intended for the Pattern Generator and Protocols. The device can generate natural division signals of the system frequency, like from 100MHz, 50, 25... and with 80MHz 40, 20...
The Logic Analyzer can sample at up to 8x of system frequency.

[Roche]

Hi @attila,

Thanks for the explanation. I have updated my scripts, where I now set the Logic Analyzer sampling frequency as a multiple of the system frequency (with the maximum being 8x). My capture timing now looks good for system frequencies other than 100MHz.

Thank you