What is the relationship between the channels and ports?

#1

Hi all,
As you known, There are two TX channels and two RX channels in LMS7002M chip.Meanwhile, there are also two Limelight ports,port 1 and port 2. Could you pls tell me what is the relationship between channel A/B and Limelight port 1/2? if I only use channel A to receive signal, in this application, what is the Limelight port to be used?

@Zack
@martywittrock