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| USB logic analyizers - current thoughts on 'the best'? |
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| metebalci:
--- Quote from: alm on February 19, 2024, 01:32:04 pm --- --- Quote from: metebalci on February 19, 2024, 11:35:38 am ---I also have a Digital Discovery, but AFAIK, it does not have an external clock input. --- End quote --- I'm pretty sure it supports state mode in addition to timing. Look for sync capture mode. It just does not have a dedicated input like some other logic analyzers. --- End quote --- I think you are right, I think I remember something like the trigger and ext clock cannot be used at the same time. |
| metebalci:
--- Quote from: tggzzz on February 19, 2024, 01:41:56 pm --- --- Quote from: alm on February 19, 2024, 01:32:04 pm --- --- Quote from: metebalci on February 19, 2024, 11:35:38 am ---I also have a Digital Discovery, but AFAIK, it does not have an external clock input. --- End quote --- I'm pretty sure it supports state mode in addition to timing. Look for sync capture mode. It just does not have a dedicated input like some other logic analyzers. --- End quote --- Some logic analysers have such a state mode without having dedicated clock inputs. They interpret a 0->1 transition on a general input as a clock rising edge, which implies the state mode's capture rate must be 4 times slower than the asynchronous mode's capture rate. --- End quote --- Maximum for external clock is I think around 100MHz and half for DDR. This part of digital discovery is not document well to my opinion. |
| three_jeeps:
Thank you for the very helpful information!!! Much appreciated! |
| three_jeeps:
--- Quote from: tggzzz on February 19, 2024, 09:48:07 am ---There's an aspect of logic analysers that is often overlooked: the desirability and ability to not capture data. If you use the filtering and triggering capabilities of "decent" logic analysers, you can avoid seeing lots of irrelevant crap thus leading you to concentrate on the small proportion of interesting information. That has the benefit of making long capture buffers less important. --- End quote --- Thank you. Appreciate the point. I used LA's extensively through the 1980s and well aware of being able to configure/specify discriminators. The Gould/Biomation units were the absolute best at doing that. Later the HP 1671G more or less caught up to it . I used various Tek and HP LA's and was part of an eval team for HP to put a couple of their LA's against some prototype CPUs we were developing for NASA. I've been away from the hardware edge of things for a number of years and am curious at to what is out there now. I do have one HP and one Tek in my basement lab but they are beasts to lug around compared to the smaller USB ones. I do like the logic pro 32 but the prices is a bit out of my budget.... |
| tggzzz:
--- Quote from: three_jeeps on February 19, 2024, 10:27:52 pm --- --- Quote from: tggzzz on February 19, 2024, 09:48:07 am ---There's an aspect of logic analysers that is often overlooked: the desirability and ability to not capture data. If you use the filtering and triggering capabilities of "decent" logic analysers, you can avoid seeing lots of irrelevant crap thus leading you to concentrate on the small proportion of interesting information. That has the benefit of making long capture buffers less important. --- End quote --- Thank you. Appreciate the point. I used LA's extensively through the 1980s and well aware of being able to configure/specify discriminators. The Gould/Biomation units were the absolute best at doing that. Later the HP 1671G more or less caught up to it . I used various Tek and HP LA's and was part of an eval team for HP to put a couple of their LA's against some prototype CPUs we were developing for NASA. I've been away from the hardware edge of things for a number of years and am curious at to what is out there now. I do have one HP and one Tek in my basement lab but they are beasts to lug around compared to the smaller USB ones. I do like the logic pro 32 but the prices is a bit out of my budget.... --- End quote --- Similar experience here. When I managed to return to embedded systems, I was delighted and appalled at how little had changed in 30 years: still C on 8bit processors. The only major differences are smaller/faster/cheaper, adc/dac performance, and energy harvesting. Yes, I know that's an exaggeration, but there is more than a grain of truth in it. There are also signs of light, especially w.r.t. highly parallel software and hard real-time software. Still, at least I can afford things like an Agilent 1682 LA, an HP8562 spectrum analyser, far too many scopes, an Agilent 53310 modulation domain analyser, 8 digit DMMs, and other weirder test equipment. All you have to do is watch and be patient :) And I'm waiting for the new BusPirate 5, to use as a protocol analyser/stimulus. Now I just have to make time to get back to playing with a circuit I first used in the.late 70s: an n-path filter and it's modern variant, the Tayloe mixer. Oh, and a scanning tunnelling microscope. |
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