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1 external RAM shared between 2 separate FSMCs

Question asked by Makhrov.Dmitri on Oct 16, 2012
Latest reply on Oct 19, 2012 by jj.sprague
Hi all,

I'd like to make 2 STM32F407 share 1 external RAM as a common memory. Chip #1 would store some data in RAM for chip #2, then stop all accesses and signal to #2 that there is some data for him. Chip #2 would do its job, store result in the same external RAM, abandon it and signal to #1 that it is done.

I see it is not easy to just "Hi-Z" FSMC pins, since they would retain their modes as inputs or (even worse) outputs even if FSMC is deinitialized.

Is there any possibility for external RAM sharing then?


P.S. I'd like to avoid too big hardware overhead