I am working on a customized receiver, and I want to only enable fast or slow AGC for only certain period and have the gain remain unchaged the rest of the packet. For example, I need to receive a 2ms long packet, among which the first 100us is preambles used for detection and synchronization. I only want AGC adjusts receiver gain within the 100us, and after that the receiver gain remains unchanged for the rest of the packet (data portion). How could I do that? Thank you very much.