UG-1828
Preliminary Technical Data
Rev. PrC | Page 110 of 338
In this example, shown in Figure 110, we demonstrate how new frequencies will be loaded on the fly in automatic ping pong mode.
Suppose user has already configured the frequency hopping mode to automatic ping pong mode. And table A has a single entry loaded
before frequency hopping operation. The following rising/falling edges refer to HOP signal.
Figure 110. Example 1 Load New Frequencies with Automatic Ping Pong
•
At the first rising edge, the ADRV9001 reads the hop table entry from table A (the single entry) and prepares that frequency for the
next frame. At this point, the ADRV9001 switches to table B, which currently has no frequency information. Therefore, ADRV9001
will not read from table B yet at his point, it reads from table B at the upcoming HOP edge (the first falling edge).
•
The first hop frame starts. During this frame time, BBIC will load a single entry into table B. BBIC must ensure the entry is loaded
into ADRV9001 memory prior to the next HOP edge (the first falling edge).
•
At the next HOP edge (the first falling edge), ADRV9001 reads the new entry from table B and switches to table A. This frame
(from the first falling edge to the second rising edge) uses table B entry.
•
At the next HOP edge (the second rising edge), at this point BBIC can load a new frequency entry into table A. This frame (from
second rising edge to second falling edge) uses table B. And the process is repeated.
By following this process, the user can provide a new frequency on the fly to ADRV9001 at each HOP edge.
Note that the user does not need to load just a single entry. With automatic ping pong mode, user can load from 1 to 64 entries. However,
the user should ensure that the frame timing allows the amount of time required to load the table prior to the automatic switch. We
support 1, 4 and 8 entries, the minimum frame length for single entry is 46 us, and minimum frame length for 4 entries is 22 us and, and
for 8 entries is 20 us.
Example 2: Loading a Larger Set of Frequencies with Manual Table Switch
Figure 111. Loading a Larger Set of Frequencies with Manual Table Switch
DWELL
TRANSITION
DWELL
TRANSITION
24159-
489
DWELL
t
tableLoad
t
tableLoad
t
TableSwitch
DWELL
TRANSITION
TRANSITION
DWELL
TRANSITION
HOP FRAME
(TABLE A)
HOP FRAME
(TABLE A)
HOP FRAME
(TABLE B)
HOP FRAME
(TABLE B)
HOP
HOP SELECT
CHANNEL SETUP
FH TABLE B
FH TABLE A
