[RAM] STM32F103VCT6 has 48KB RAM , By modifying the upper limit in keil5, I was able to use 58k

[Passerby]

Why ? Why can I use more than 48KB RAM?

Thanks!

[Passerby]

@SofLit  @Peter BENSCH  @STTwo-32  @Tesla DeLorean 

[SofLit · Accepted solution]

Hello,

Physically the RAM size is there but it's not tested in factory. So using more than 48KB in that device is not guaranteed. 

This is not an exception on this device and the subject does not cover only the RAM, it could be also the Flash.

Hope I answered your question.

[Uwe Bonnes]

As STM32F103VC is same die as STM32F103V(D|E), same amount of ram is etched into the die. How this additional resources are exposed ore not and tested or not is totaly up to STM.

[Passerby]

Hello, @SofLit 

Does this mean that this part of the Ram is untested and not corrupted

Thanks!

[SofLit]

Its usage is not guaranteed and user may face quality issues for the region > 48KB.

[hamo]

Hello @Passerby ,

how did you modified the upper limit of RAM in Keil?

I am using Keil5 too.

[Passerby]

Hello @SofLit 

@Uwe Bonnes said that the same die was used for the F103VC VD VE ，is this correct？

Does this mean that when different series of chips are tested in the factory, only the parts of the corresponding chip in the die that need to be tested are tested, so that they become different chips

Thanks!

[Andrew Neil]

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@Passerby wrote:

Does this mean that this part of the Ram is untested

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Yes.

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@Passerby wrote:

and not corrupted

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It means you get absolutely no guarantees whatsoever about it - it might be fine; it might be rubbish; it might appear to be fine under certain limited conditions (eg, on your desk/bench), but fail under others (high/low supply; high/low temperature, etc); it might not be there at all in a future product revision; etc, etc, ...

In other words, you might get away with using it for experimentation under limited conditions - but you should absolutely not  rely upon it for anything critical, or in a shipping product.

#ExtraRAM #ExtraResources #Untested

[Passerby]

Options For Target -->Read/Write Memory Areas --> Size     , Change it to bigger