关于CC1120 RSSI/CS Timing Diagram的问题

回复如下：

1) The AGC will start with max gain and will update x number of times, depending on the signal strength received.

The figure is meant to show the carrier sense response time and other RSSI related signal in two cases (two different RSSI_VALID_COUNT) in a situation where you would receive a fairly weak signal (only 1 gain reduction)

2) The carrier sense response time will tell you when the carrier sense is valid (assertion of CARRIER_SENSE_VALID). This corresponds to the first RSSI_UPDATE. After that, the CARRIER_SENSE_VALID will be asserted as long as the device is in RX mode, but the CARRIER_SENSE signal will/can go high/low after that, depending on the signal strength. CARRIER_SENSE will be updated on RSSI_UPDATE.

3) Not sure I understand the question. The RSSI update rate = T2*(2RSSI_VALID_CNT + 1).

Usually you use a 4 byte long sync word, so you need to make sure that your preamble is long enough so that:

(# preamble bits + 32)/data rate > 2*( RSSI update rate)