I.MX RT1176 How to configure the size of DTCM or ITCM

[Vinos]

The memory map chapter indicates ITCM and DTCM both have 512KB.And Chapter 33.2 Feature saids "configurable size instruction and data TCM (default 256kB ITCM /256kB DTCM) with ECC interface".

But how can I configure the size of DTCM or ITCM.

[illy777]

Hello,

question regarding this topic:

So the maximun possible size that is configurable in all the internal RAM(ITCM+DTCM+OCRAM) is 628KB when ECC is disabled? 

Because indeed in the addresstable of the CM7 Core there is 512 KB for ITCM and DTCM each. But I think this is because it would be in theory possible to just configure ITCM or DTCM right?

What about the OCRAM(1,2) Spaces which have also each 512 KB?

The question is, what is the actual physical space that I can use on this Chip? Because it was stated that there was 2MB RAM usable. But now that I read into it it seems that I have roughly more than a quarter of that.

Thank you for your support,

Isaac

[kerryzhou · Accepted solution]

Hi @Vinos ,

  Please refer to AN12077:

https://www.nxp.com/docs/en/application-note/AN12077.pdf

1. in the reset ISR, use the GPR16,GPR17,GPR18 to reallocate the flexRAM
2. MPU side, the flexRAM should match the reallocated flexRAM
3. memory area, use the new allocated size
4. debug script add the flexram reallocate register control
5. if code copy to reallocated RAM, the flexRAM reallocate register configuration can put to the DCD area.

Wish it helps you!

Best Regards,

Kerry