Changes To Example 1: Load New Frequencies With Automatic Ping Pong Section - Analog Devices ADRV9005 Reference Manual

Reference Manual ADRV9001
FREQUENCY HOPPING
In the DGPIO mode, when the hopping table select pin is low, table A is set as the active table, and when the hopping table select pin is set
high, table B is set as the active table. The falling or rising edge of HOP Table Select signals the switch to the A or B table, respectively.
Figure 110 shows that the HOP Table Select pin is sampled at the hop edge. Set the HOP Table Select pin before the upcoming hop edge. The
ADRV9001 resets the hopping table index to zero upon switching. In other words, when switching between tables, the new table always starts
at entry 0. By using the Automatic Increment indexing method, the table index is iterated over, as discussed earlier, and as shown in Figure 110.
Figure 110. Manual Table Switch with Automatic Increment
Manual Switch with Index by Pin
With manual switch, user can also index the current hopping table by using a DGPIO pin. Note that the ADRV9001 cannot automatically
perform ping pong switching between tables when indexing the table by the pin mode.
Frequency Hopping Table Real-Time Process
Pre-process refers to the hopping tables being sent to the ADRV9001 and processed before the FH operation begins. In such a case, user
should fully know the hopping table content at the initialization and it cannot be changed on the fly.
Real-time Process refers to the hopping table not being processed at initialization but at the hopping stage. At each hop, the next entry in the
current table is read and processed. This allows the update of the hopping tables on the fly. Note this mode also supports loading the table at
the initialization, if it is known.
The following examples show two typical uses cases with the real-time process.
Example 1: Load New Frequencies with Automatic Ping Pong
This example, as shown in Figure 111, demonstrates how new frequencies are loaded on the fly in the automatic ping pong mode with the PLL
Mux mode. Suppose the automatic ping pong mode is already configured and table A has a single entry loaded before FH operation, a new
table with a single entry is loaded for each hopping frame.
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