nRF52840 ROM and IRAM size configuration - Keil

[PriyeshN]

I have recently started understanding nRF52840 using SDK v17 and soft device S140 v6.0. I'm using Keil as my dev environment.

Opening any of the SDK example in Keil, when I go to project options to check IRAM Size and start address, I find that in all the examples for nRF52840, the sum of start address and size is always 0x20040000. This corresponds to 512 MB of RAM, which is in contrast to the 256 KB size provided in datasheets and specs.

Can someone please help me understand on how to provide the "Size" configuration for nRF52840. 

[Vidar Berg]

Hello,

The actaul address range is 0x0 - 0x40000 because RAM starts at adress 0x20000000, please see "Memory" in PS for more details about address mapping.

[PriyeshN]

Thanks Vidar Berg