Modes Of Operation - Analog Devices ADRV9001 User Manual

UG-1828
Automatic mode simply auto-increments in the frequency table.
Table 32. Frequency and Gain Index Selection Modes
Selection mode Notes
PIN Uses DGPIO pins for the user to provide a frequency and gain index.
The number of frequencies or gain levels which can be indexed are restricted to the number of available DGPIOs.
6 DGPIOs are required to index a maximum of 64 operating frequencies.
3 DGPIOs would be required to index, for example, 8 gain levels.
API The user is asked to provide frequency and gain index and they are loaded via API
AUTO Autoincrements through a frequency hopping table.
When the end has been reached, it loops back to start.

MODES OF OPERATION

The following are the four proposed modes of operation that are defined to support different timing, performance, and application
requirements. The main difference between the four modes is the transition time and dwell time allowed.
Table 33. Frequency Hopping Modes of Operation
Transition
FH Mode Time
Very Fast Short (< 10 μs)
FH (VFFH)
Fast FH Short (< 10 μs)
(FFH)
Medium (60 μs
Normal FH
- ~250 μs)
(NFH)
Slow FH Long
(> ~250 μs)
(SFH)
The number of LOs is shown in these modes. For VFFH and FFH modes 2 LOs are required and for NFH and SFH only 1 LO is
required. Depending on the time allowed in each mode, PLL cal mode can be either in coarse cal mode or fine cal mode. In the 2-LO
modes, which are VFFH and FFH, the PLL can be retuned within 2 transitions + 1 dwell time. In contrast in the 1-LO modes, the PLL
must be retuned within 1 transition time. For this reason, in NFH mode, we use coarse cal mode for PLL and not fine cal mode.
The gain selection must be in fixed mode in the VFFH mode and does not change during the transition time. However, user can provide
a table of frequencies and their associated gain values before setup time and the information can be utilized so that each frequency can
have a specific gain value associated with it.
Frequency selection can be in the format of a frequency table or "on-the-fly".
The frequency table is loaded by BBIC to ARM memory, there are up to 64 frequencies in the table. This allows ARM to precompute the
DMA tables, and at hop time the frequency and any configuration associated with it is loaded.
On-the-fly means that the user does not need to provide the frequency table prior to setup time. Instead, the user can provide a new
frequency in Hz before the next hop frame. ARM obtains the new frequency and generates a new DMA table and get ready. This,
however, is not supported in the VFFH mode where there is simply not enough time to do so.
Note, the mode of operation for frequency hopping is set during the boot-up time, currently, we do not allow changing of the mode of
operation in the operation time.
Note also, PLL retune time depends on the reference clock frequency and it is not absolute.
Dwell PLL Retune
Time PLLs Time
Short (< 2 LO 2 transitions +
10 μs) Mux 1 dwell
Long (> 2 LO 1 transitions +
500 μs) Mux sub 1 dwell
Long (> Sub 1
1 LO
500 μs) transitions
Long (> 1 LO Sub 1
500 μs) transitions
Rev. PrA | Page 86 of 253
Preliminary Technical Data
PLL Cal Gain
Mode Selection
Coarse Cal FIXED
mode (20us
lock)
Fine Cal API/PIN
mode (250us
lock)
Coarse Cal
API/PIN
mode (20us
lock)
Fine Cal API/PIN
mode (250us
lock)
Frequency
Selection Channel
Table based (PIN, Single (1T1R)
AUTO, API)
Table based (PIN, Single (1T1R)
AUTO, API)
or on-the-fly (High
priority mailbox)
Table based (PIN, Single/Dual
AUTO, API) (1T1R or 2T2R)
or on-the-fly
(High priority
mailbox)
Table based (PIN, Single/Dual
AUTO, API)
(1T1R or 2T2R)
or on-the-fly
(High priority
mailbox)