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Use of Different CPU registers on C66x

Hello,

Can someone summarizes the functions/use of different DSP registers A0-A31/B0--B31 for DSP core C66x?

E.g

B15 for System Stack Pointer

B3 for Return pointer

B14  for Base register for accessing near data

etc.

I checked the CPU guide, but could not find any details on this topic.

Regards

Prasad