SM3G Datasheet, PDF (10/36 Pages) Connor-Winfield Corporation – ULTRA MINIATURE STRATUM 3 MODULE

Detailed Description continued
The automatic reference selection is shown in the following state diagram:
Figure 6
Automatic Reference Selection
Ref_Rev_Delay
time expired
Stay
Locked on Ref m
time for t=
Ref_Rev_Delay
Ref n returns,
Ref m marked
“revertive”
Ref n returns,
Ref m marked
“non-revertive”
Locked
on Ref n
Loss of Ref n
Select &
Lock on
Select new reference:
Ref m
Next highest priority,
Qualified (within max. pull-in range, signal present > 10 sec.),
Non-masked
The operational mode is according to the following state diagram:
No available reference and no Hold Over history
Ref loss w/no good Hold Over history and no other available reference
Figure 7
Automatic Operational Mode Selection
Reference Available
(Select highest priority)
Higher priority Ref return with
prior reference marked
“revertive”
Locked
Ref Loss w/alternate
reference available
Ref loss w/no good hold
over history and no other
available reference
Ref Loss w/good hold over history
and no alternate reference available
No available
reference and
no hold over
history
Free Run
Ref
Return
Ref
Return
Hold Over
SM3G5 Data Sheet #: TM083 Page 10 of 36 Rev: 05 Date: 01/26/11
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