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TMS320F280023: Hi, I meet a problem with F280023, when I reboot mcu, it got stuck

Part Number: TMS320F280023

Hi 

I meet a problem with F280023,

It works good when I load FW from XDS110, then when I reboot mcu, it got stuck (  XRSN generating low pulse continuous )

I checked something as below

1. GPIO24 and GPIO32, both of them are HI level

2.cmd file is 280023_FLASH_Lnk.cmd

3. VDDIO is 3.3V

4. The oscillator is INT_OSC2

what else should I need to check?

Thx