Blog Mention! + sdramThingZero

A project log for sdramThing4.5 "Logic Analyzer"

An AVR, 128MB SDRAM DIMM, old laptop LCD, and a handful of TTL chips -- 30+MS/s 32-channel logic-analyzer interface for an analog 'scope

Eric HertzEric Hertz 03/15/2016 at 23:462 Comments

Alright, first-off... a Major Thank You to @Al Williams

(I think I got it right, this time ;))

For The blog write-up to rule them all...

(Or, maybe not "them all" as in all-blog-write-ups in general, but as in a write-up [about sdramThing] to rule all write-ups about sdramThing that've been attempted (as far as I'm aware, having been the only other write-up-attempter, as far as I'm aware, and having been exceedingly wordy and likely quite confusing in all cases. That is to say, thanks for coming up with an explanation that actually makes sense, without my incessant rambling! And for attracting attention by so many, including those who understand the odd-hackery I'm quite proud of that went into this goofball-concept! Nevermind the slew of ideas-generated and resources-mentioned in the comments-section... Wait, what? I'd gotten used to knowing the HaD Blog for a different type of commentator! But this is pretty cool, too.).

So, now... Per this project's previous log-entry and despite my prior cynicism, and with a lot of great insight from others (see "previous log-entry)"... I think it's plausible, nay probable, to create #sdramThingZero - 133MS/s 32-bit Logic Analyzer... a new, GPIO-based peripheral-ish to connect to nearly anything with GPIOs (especially, maybe, a PiZero, with its display/HID abilities and huge processing-power!) based on little more than an SDRAM DIMM and some glue-logic. Possibly, probably-maybe--based on some inspiration from the blog's unusually-insightful commentators--some of this project's necessary-glue-logic (as well, maybe, as that necessary for some features newly-inspired from others amongst the afore-mentioned commentators) might actually be implementable within the very SDRAM that needs the glue-logic in the first place.


Suffice to say... We're talking... plausibly, relieving much of the glue-logic and latches necessary for e.g. "one-shots"... We're talking, plausibly, adding new features such as complex-triggering (e.g. via serial/parallel data-pattern-matching)... and, quite-plausibly, doing-so with little more circuitry-wise than what's already available on the SDRAM DIMM, [redundantly] already...

This is getting dense and intense... but is a challenge, at least mental, that seems, at least to me, worthy of at least as much time as many of the mental "challenges" many of us convince ourselves are necessary on a daily-basis.

So... If you dig what you've seen, here, and are interested in seeing it branch-off in a newly largely-group-inspired direction that could quite-plausibly be not only usable/useful, but also repeatable with little more than a Single-Board-Computer (or microcontroller, plausibly even a PC's parallel-port) of your choosing, a PCB-order, and an old DIMM likely already in your aging collection, consider visiting/following (and even joining?) #sdramThingZero - 133MS/s 32-bit Logic Analyzer, in addition to this one!

This'll be an entirely new, and completely un-pre-thought-out path for me, as far as projects go, so... who knows what'll happen... It's plausible it'll be a *very* slow process. (It took four-five years to get to this point). It's also entirely plausible everything I'm envisioning fitting together like puzzle-pieces these past few hours is nothing more than too much coffee and delusions of grandeur. But do follow!

Or, if you find yourself creating something from any of these ideas, I'd love to hear about/link it.

Thanks again, Al Williams, for the write-up/attention!

And thanks to everyone who's given great ideas already... Let's keep 'em coming till my brain explodes(?)!

(If you dig it... I hate to ask... but I could also really use some moolah, in general these days, but this month especially.)


Roman wrote 03/16/2016 at 01:18 point

Two thumbs up 😊

  Are you sure? yes | no

Eric Hertz wrote 03/17/2016 at 08:07 point

Thanks! Glad to see you finally got a workbench pic on your profile backdrop... but that's hardly a mess ;)

  Are you sure? yes | no