Preliminary Technical Data UG-1828
Rev. PrC | Page 119 of 338
For LO retune case, the difference is Tx setup rising edge now marks the beginning of the interface. txAnalogPowerOnFrameDelay starts
when hop signal first samples a High of Tx setup signal with value of 3, then decrement to 0 with edge coming hop edge. When reaching
0, Tx analog is powered on. The value will remain 0 until Tx is sampled with low, and the value will be set back to 4.
Figure 121 Tx Only with Long Propagation Delay for LO Retune
Tx Only with Short Propagation Delay
There is a restriction to how long before the hop edge the Tx setup falling edge must come. For profiles with very short propagation
delays, this means the interface will be on longer than required for valid data to reach the analog front end.
Figure 122, shows one option that user can pad their data with zeros or a known pattern and start transmitting as soon as the interface is
enabled. This way although interface is on earlier, the transmitted data will be a known pattern when it reaches analog front end.
Figure 122. Tx Only with Short Propagation Delay, Padded Data Method
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