CCS/PGA411-Q1: what may cause the bits of register "DEV_STAT 4" error?

Part Number:PGA411-Q1

Tool/software: Code Composer Studio

I read the  register of DEV_STAT 4 , the bits  "ABISTF"  and "SFAULT" were  always  set to 1.

I want to know , what reason may cause these two bits to be 1 ?

please help.

thank you.