2024-06-01 10:23 AM
Hi all,
I was reading through the documentation of the STM32H723 to find out what clock speed I can configure the FMC to run at using an external SDRAM. Looking at older posts and videos there is mentioned 100 MHz, but when I look at the newer/revised (revision 3) the max kernel fmc frequency has increased from 200 to 275 MHz:
Does this mean that now an external SDRAM can run at 137.5 MHz (kernel clock / 2) and not 100 MHz?
Best regards
Links I have compared to:
https://www.youtube.com/watch?v=h28D4AaPSjg (14:00 min)
Solved! Go to Solution.
2024-06-02 04:34 AM - edited 2024-06-02 04:36 AM
Hi, I found the solution on page 143 in the datasheet.
https://www.st.com/resource/en/datasheet/stm32h723zg.pdf (Only 550MHz MCUs)
2024-06-01 10:43 AM
SDRAM typically has a FMCCLK DIV2 and DIV3 option
2024-06-02 04:34 AM - edited 2024-06-02 04:36 AM
Hi, I found the solution on page 143 in the datasheet.
https://www.st.com/resource/en/datasheet/stm32h723zg.pdf (Only 550MHz MCUs)
2024-10-30 09:45 PM
DS_STM32H723x_Rev4, page 143 in the datasheet shows results for CRAM (FMC_SDCLK max is 137MHz:(
page 153 in the datasheet shows results for SDRAM (FMC_SDCLK max is 95MHz:(