[sdiy] external memory for microcontrollers

[Richie Burnett]

This can be an issue with high speed DRAMs. You don't want the CAS and RAS lines arriving at the chip before the address and data. Otherwise the memory chip can be trying to latch part of an address value before the address lines have settled, or trying to write some data while the data lines are still on the move. Essentially degrading the setup and hold times.

It's certainly worth keeping connections as  short as possible. No 3" long flying leads across breadboard construction!

-Richie,



Sent from my Xperia SP on O2

---- Ingo Debus wrote ----

>
>> Am 16.02.2017 um 00:06 schrieb Eric Brombaugh <ebrombaugh1 at cox.net>:
>> 
>> It's easy to set up and works without too much fuss. You'll generally find that you have to move to the 144-pin package to get sufficient pins for a memory connection though, and that will increase the cost of the MCU somewhat.
>
>I’ve heard that the PCB traces for the address/data lines have to be matched in length. Is this really true?
>
>Ingo
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