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TMS320F28027: C2000 Gang doubts

Part Number: TMS320F28027

Hi,

Customer is using C2000 Gang for programming.

Several doubts:

1) Checksum is for Gang internal verification. What's calculated by checksum? For different version of Gang GUI, are they the same? As I know, the code content, code name, image name are calculated. 

2) 3.3V power supply, what's the logic inside Gang? Between different firmware of Gang, is the logic the same? Customer has two, one can supply 3.3V to the target board, while the other can't. 

Thanks a lot.

Br, Jordan