TMS320F28388D: CLA Access Arbitration on LSx RAM

Amulrass Vazhumuni

Intellectual 435 points

Part Number: TMS320F28388D

Hello,

I see the below information in the TRM for CLA Fixed priority arbitration scheme on Local shared Memory.

The following is the order of fixed priority for CLA accesses:

Data Write
Data Read/Program Fetch

For CLA, Program Memory and Data memory cannot reside in same LSx memory block. Then why does the Program Fetch and Data Read are shown in same priority?

Ideally Program Fetch and Data access don't conflict with each other for CLA, because they must happen on different LSx RAM blocks and each LSx RAM block have their own arbitration logic. Am I right?

Best Regards

Amulrass V

over 4 years ago

0 Veena Kamath over 4 years ago

TI__Mastermind 32375 points

Hi Amulrass,

Apologies for the delayed response.

Your query is assigned to an expert. You will get a response soon.

Regards,

Veena

0 Praveen Kumar Ravichandran over 4 years ago in reply to Veena Kamath

TI__Expert 4580 points

Amulrass,

You are right. A particular LS memory can only be either CLA program or data.

However, CLA debug read/writes are possible on program memory(provided for debug purposes) and those writes are prioritized over program fetch

Regards,
Praveen

0 Amulrass Vazhumuni over 4 years ago in reply to Praveen Kumar Ravichandran

Intellectual 435 points

Hello Praveen,

Thanks for your reply. Shouldn't this need to be corrected in TRM?

Mixing of debug Reads and debug Writes along with Program Fetch in the Fixed Priority Arbiter for CLA, creates unnecessary confusion.

Now, I have further question. For CLA, which has higher priority Data Read or Data Writes (not debug modes)?

Best Regards

Amulrass V

+1 Praveen Kumar Ravichandran over 4 years ago in reply to Amulrass Vazhumuni

TI__Expert 4580 points

Amulrass,

We will get the technical documentation to add more clarity here. Thanks for the input.

On your 2nd question, the CLA data writes has higher priority compared to data reads

Regards,
Praveen

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TMS320F28388D: CLA Access Arbitration on LSx RAM