Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 508 of 669
Servo Parameters
The default clock servo uses a PID regulator to calculate the current clock rate. The formula is:
clockAdjustment =
OffsetFromMaster/ P constant
+ Integral(OffsetFromMaster)/ I constant
+ Differential OffsetFromMaster)/ D constant
Display
If true then Offset From Master, MeanPathDelay and clockAdjustment are logged on the debug
terminal.
P-enable
If true the
P
part of the algorithm is included.
I-Enable
If true the
I
part of the algorithm is included.
D-enable
If true the
D
part of the algorithm is included.
'P' constant
[1..1000] see above.
'I' constant
[1..10000] see above.
'D' constant
[1..10000] see above.
Filter Parameters
The default delay filter is a low pass filter, with a time constant of 2*
DelayFilter
*DelayRequestRate.
The default offset filter uses a minimum offset or a mean filter method.
The minimum measured offset during
Period
samples is used in the calculation.
The distance between two calculations is
Dist
periods.
If
Dist
is 1 the offset is averaged over the
Period
,
If
Dist
is >1 the offset is calculated using 'min' offset.
DelayFilter
See above
Period
See above
dist
See above