The RX analog chain has two main components, one if the RF (ie the LNS , mixer), and second the baseband after down convertion(ie the VGA, HPF etc.). The RX chain corresponds to the complete RX chain gain, RF + baseband. The RF gain is the LNA and mixer only.
The firmware tries to achieve the RF target gain and the remaining gain is got from the baseband to meet the Rx chain gain.
