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June 26, 2026
Question

STM32H753 FMC asserting WE before NE

  • June 26, 2026
  • 1 reply
  • 24 views

Hello,
I am currently trying to leverage STM32H753 FMC feature to interface with legacy Motorola flexbus style peripheral.
I suspect the answer to my question is no but I could not find an explicit statement within documentation saying it is precluded hardware wise :
Is there a mode / configuration (down to the registers level) that could allow the write enable signal (WE) to be asserted before the chip select signal (NE) ?

Thanks

1 reply

mƎALLEm
ST Technical Moderator
June 26, 2026

Hello ​@dufrespa and welcome to the ST community,

There is no FMC behavior than what was described in the RM433 section / 22 Flexible memory controller (FMC). Refer to figures showing the different access waveforms..

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