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TMS320F28377D: CPU2 Emulation and Stand-alone boot flow

Part Number: TMS320F28377D

Hi everyone

For CPU2 Emulation Boot flow the following fig has been depicted in the Technical Reference Manual (spruhm8h.pdf) section4 (Rom code and peripheral Booting) page 587 and 589 :

Question 1 : Where/What are the "A" and "B" symbol ? 

and also the following is depicted for Stand-alone Boot flow for CPU2:

Question 2 : Why the starting point is again "Emu Boot" ? and why it is exactly same as Emulation Boot flow?

Thank you all