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AAlek.2
AAlek.2
Associate
August 23, 2021
Question

STM32H745ZI(LQFP144) FMC and SDRAM support

  • August 23, 2021
  • 2 replies
  • 2860 views

0693W00000Dq8MzQAJ.png0693W00000Dq8MpQAJ.pngHello ST community! I have a question about FMC on STM32H745ZITx (LQFP144). In the datasheet DS12923 (https://www.st.com/resource/en/datasheet/stm32h745zg.pdf) it is not said whether it supports SDRAM. And there is no "SDRAM" item in the FMC settings in CubeMX. Does it really not support SDRAM or is it a bug?

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2 replies

Tesla DeLorean
Tesla DeLorean
Guru
August 23, 2021

The STM32H745 should, you might need to take a Pin Inventory on the 144-pin, to check what escapes that, figure that's 30-minute due-diligence task at most.

About 10 min mark talks about SDRAM

https://www.youtube.com/watch?v=khTtSIhrIHY

BGA parts for sure

https://www.st.com/en/evaluation-tools/stm32h745i-disco.html

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AAlek.2
AAlek.2Author
Associate
August 23, 2021

in the datasheet for many SDRAM addresses, GPIO is not assigned. This means that SDRAM is not available, am I right? 0693W00000Dq8lBQAR.png

TDK
TDK
August 23, 2021

The FMC_A0 pin isn't broken out on the LQFP144, among others.

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AAlek.2
AAlek.2Author
Associate
August 23, 2021

I'm sorry, my English is bad, can you rephrase your answer?

TDK
TDK
August 23, 2021

FMC_A0 isn't available. Other pins are also not available. You can't use SDRAM on this chip.

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