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CCS/UCD3138: I don't understand PEC_VALID of UCD3138 ?

Part Number: UCD3138

Tool/software: Code Composer Studio

I find the register of PEC_VALID :

PEC Valid Indicator
0 = Received PEC not valid (if EOM is asserted)
1 = Received PEC is valid 

the meaning is when received wrong PEC , the PEC_VALID is Low ;when received right PEC , the PEC_VALID is Hi ?

Is PEC verification handled by hardware or software?

The system takes PEC to PSU write byte and no PEC to write word. How is the hardware distinguished?

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