CC2640: How to do a cJTAG/JTAG host for cc2640

Part Number:CC2640

Hi,

      I want to do a cJTAG/JTAG host to program(burn) cc2640 embed flash myself.

     What is the communication protocol of cJTAG?

     Is cJTAG the default debug interface for this device?

     If so,how to switch cJTAG to JTAG?

    Thanks~

Best regards~

Xin Chen