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TMS320F28033: boot RAM model 3

Part Number: TMS320F28033

We used the tms320f28033 chip. Now we have a question about the boot ROM: when the boot mode is mode 3, must the gpio37 pin and gpio34 pin be given a high level from the outside? Will it enter boot mode 3 without high level? If you don't give high level, is there any risk?