Forum Post: 802.15.4 CCA mode 2 (Carrier Sense) implementation on CC2520

I am using a ProFLEX module (CC2520-CC2591). I would like to implement a CCA mode which complies with 802.15.4 CCA Mode 2 (Carrier Sense only). Looking at the CC2520 Datasheet (cc2520.pdf), I am not sure how I can achieve that.

Thanks.