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F429 + SDRAM PCB Design

Question asked by koepf.steffen on Sep 27, 2014
Latest reply on Sep 29, 2014 by Mark Edwards
Hello,

i am currently working on my first PCB with a STM32. The F429 and the SDRAM have LQFP/TSOP packages. Unfortunately the FMC Pins needed for SDRAM are distributed over all sides of the LQFP. I have looked on the gerber files of the F429 DISCO Board and not seen any measures to get all (data/address) lines to the same length. Well, the F429 can clock the SDRAM at max. of 90 MHz. How critical are different wire lengths under such conditions?
Is there a (non religious!, just practical) design guide?

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