Microsemi SA.22c - Changing the y Coefficients; The y Coefficients - Factory Default; The J Command

SA.22c Rubidium Oscillator
Designer Reference and User Guide Revision D 33
1.
2.
3.
4.
5.
1pps mode is enabled
r>
Note: It is not necessary for the SA.22c to be locked to enter the 1PPS configuration commands, but it
must be locked for actual synchronization to occur.
7.6.1 Changing the y Coefficients
Follow the steps to change the y coefficients
At the r> prompt, type y, then 1, and press Enter (1 indicates that the damping factor needs to be
entered).
Enter a value between 0.25 and 4, and press Enter (see Note 3 in The g Command (see page 34)
and ).1PPS Algorithm Theory of Operation (see page 36)
At the r> prompt, type y, then 2, and press Enter (2 indicates that the time constant needs to be
entered).
Enter a value between 5 and 100000, and press Enter (see Note 3 in The g Command (see page 34)
and ).1PPS Algorithm Theory of Operation (see page 36)
At the r> prompt, type z. This saves the 1PPS configuration data to non-volatile memory. If the y
coefficients are not saved with the z command, the SA.22c reverts to the previously saved
configuration upon restart. The SA.22c responds with the following output (see Note 9 in The g
):Command (see page 34)
r>z
Saving TData 2, serial number 3BE
1pps Coefs saved
7.6.2 The y Coefficients – Factory Default
If the factory default values of damping factor = 1 and tau = 400 are acceptable for the application, no
modifications to the y coefficients are required. The SA.22c 1PPS disciplining is enabled at the factory,
which allows the unit to work right out of the box. If the y coefficients need to be restored to the factory
defaults, enter the value 0 for both the damping factor and tau using the process described in Changing
. The SA.22c operates at the factory default damping factor of 1 and tau the y Coefficients (see page 33)
of 400.
7.6.3 The j Command
Press the j key at any time to return the current value in hex format from the delta register (see Note 1
in ) and the 1PPS state (see Note 2 in The g Command (see page 34) The g Command (see page 34)
and the following table). The following is the output format:
r>j
1pps Delta Reg: 0 ppsState:3
r>.
Table 13 • 1PPS States Returned with the j Command
PPS State Value Action Performed by SA.22c
INITIALIZE0STATE 0 Start up initialization
INITIALIZE1STATE 1 Start up initialization
INITIALIZE2STATE 2 Start up initialization
HOLDOVERSTATE 3 Seeking usable 1PPS
JAMSYNC1STATE 4 Sync SA.22c output 1PPS to input
JAMSYNC2STATE 5 Sync SA.22c output 1PPS to input
DISCIPLINESTATE 6 Keep SA.22c output 1PPS aligned to input by controlling
SA.22c frequency
PIDCALCSTATE 7 Calculations for disciplining algorithm