TMS320F280049: Why DCSM does not have CLA bit in Z1_GRABRAMR register?

Hi Brian,

 

In F28004x, the CLA is treated as a master just like C28 CPU from a DCSM perspective unlike in F2837x where the CLA was also treated as a resource grabbable by either Zone1 or Zone2 (FYI, this is an enhancement in DCSM as CLA in F28004x is not be tied to any single zone anymore).

 

In order for the CLA to access a RAM from a particular zone, allocate that memory as a CPU and CLA shared Program/Data memory (with the help of LSxMSEL and LSxCLAPGM registers) and program the OTP to GRAB that particular memory to the desirable Zone (Z1/Z2).

 

Hope this information helps.

Thanks & Regards

Pramod P

Hi Pramod P,

Thanks for your quick response!
Normally, we copy the CLA related code from Flash to corresponding RAM(Program/Data memory) during intialization. After that, CLA will not access flash any more.
For this application, do we need to allocate CLA RAMs to the same bank of Flash?

Regards,
Brian

Hi Brian,

I don’t understand what you meant when saying ”CLA will not access Flash anymore”. CLA does not have access to Flash anyway (even in F2837x). I am assuming that you will not be copying anymore data from Flash to RAM. Is this what you wanted to convey, please clarify?

By the way, the answer to your question “do we need to allocate CLA RAMs to the same bank of Flash?” is Yes.

Thanks & Regards
Pramod P

Hi Pramod P,

Sorry about the misunderstanding, I know CLA does not have access to Flash. I just want to clarify we will not execute any code from the CLA RAM to access to FLASH after the code is copied after initialization.

So even if we only need to copy code from FLASH to CLA RAMs, we still need to guarantee these FLASH and RAMs is protected within the same zone. Is that correct?

Regards,
Brian

OK, I got it.

Thanks Pramod P!