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TMS320F280039C: Questions about Pmbus and Syscfg

Part Number: TMS320F280039C
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

CCS:12.8.0.00012 

Syscfg:1.21.2

According to the Technical Reference Manual, the GPIO of the pmbus needs to be configured to normal mode.

However, when configuring gpio to normal mode in syscfg, an error message will be displayed, and it can only be configured to OD mode. In OD mode, PMBUS cannot work properly.

Is this a BUG? Or is my configuration wrong?