Electronics > Microcontrollers

Tutorial on Microprocessor/Memory Track Length ERC?

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EEVblog:
As has been said, it's really only an issue when you start talking high speed memory (> several hundred MHz).
Look up DDR memory app notes, that's particularly tricky stuff, and one of the most critical, there is plenty of great detail on layout issues.
Not just in terms of length matching, but transmission line termination as well. Because, really, if you have to worry about the length, then you are into transmission line territory.
Micron have some good app notes if memory serves me correctly.

Dave.

TripleFault:

--- Quote from: EEVblog on May 02, 2012, 12:52:15 pm ---As has been said, it's really only an issue when you start talking high speed memory (> several hundred MHz).
Look up DDR memory app notes, that's particularly tricky stuff, and one of the most critical, there is plenty of great detail on layout issues.
Not just in terms of length matching, but transmission line termination as well. Because, really, if you have to worry about the length, then you are into transmission line territory.
Micron have some good app notes if memory serves me correctly.

Dave.

--- End quote ---

Thanks Dave,
It's always good to hear from the master  :)
I will start reviewing some DDR App notes and muscle up on some transmission line theory.

I hadn't planned on it being an antenna, but oh well it looks like it has become that  ;D

Thanks again Dave,
And maybe you could do a Video Blog on this subject some time, I for one would watch it  :)

free_electron:
Micron and samsung have good appnotes on ddr.
It gets really funky when you push into ddr3 territory.... I did a board for the Spear600 ( the same beastie driving dave's scope) processor a while ago... Full of 'curly bits'. we used samsung ram. Series resistors were bot needed but length tuning was.

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