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SYoko
SYoko
Visitor II
February 25, 2021
Question

FMC and SDRAM sample

  • February 25, 2021
  • 1 reply
  • 930 views

I'm using STM32F469 with 2M x 16 x 4banks (16MB) SDRAM.

I'm just trying to run FMC_SDRAM sample for STM32469l-EVAL and it seems the first 256 data could write/read successfully.

My question is that to access memories in 2 to 4 banks, do I need to send commands to these banks ? Or can I access memory address like 0xC0000000 + 8000000 ?

In "BSP_SDRAM_Initialization_Sequence" function of sample codes, only FMC_SDRAM_CMD_TARGET_BANK1 is used.

I'm new to FMC/SDRAM so any advice will be appreciated.

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1 reply

Tesla DeLorean
Tesla DeLorean
Guru
February 25, 2021

Make sure you've configured all the pins properly, double check via debugger view of GPIO peripheral. Perhaps also look at the F469-DISCO. But either way, make a list of all pins, and confirm everything is accounted for, and that the slew rate/speed is the 50 MHz one rather than 100 MHz

BANK in this context I think is the STM32 one ie 0xC0000000 vs 0xD0000000

BA0/BA1 would be used with ROW/COLUMN addressing, so yes your whole memory should be linear.

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