How to simulate RAM ECC function?

Nki h.1 · ‎2020-07-20

I am using STM32H745.

Among the functions of STM32H745, RAM ECC function is used.

The product that I develop should stop working when the RAM has an abnormality.

So, if something goes wrong with RAM, I want to check if the function I implemented is working normally.

I want to simulate an abnormality in RAM through the debugger and generate a RAMECC Interrupt. How can I do this? Or let me know if there are any documents that might help.

Andreas Bolsch · ‎2020-07-20

As far as I know there is no documented way to do this explictily. However, after power-on or wake up from standby RAM contents should be indeterminate. Simply don't initalize the various RAM sections completely (e.g. modify the linker script so that a block at the end is not touched), and then do read accesses to these uninitialized areas. Chances are high you will hit some ECC errors.

But: The RAM should be unpowered for several minutes as the memory cells might keep their previous contents for some time even after power off.

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Andreas Bolsch · ‎2020-07-20

As far as I know there is no documented way to do this explictily. However, after power-on or wake up from standby RAM contents should be indeterminate. Simply don't initalize the various RAM sections completely (e.g. modify the linker script so that a block at the end is not touched), and then do read accesses to these uninitialized areas. Chances are high you will hit some ECC errors.

But: The RAM should be unpowered for several minutes as the memory cells might keep their previous contents for some time even after power off.

Nki h.1 · ‎2020-07-20

Thank you very much.

It was very helpful.