ACS8515REV2.1T View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8515REV2.1T' PDF : 50 Pages View PDF
ACS8515 Rev2.1 LC/P
ADVANCED COMMUNICATIONS
FINAL
Figure 10. Automatic Mode Control State Diagram
(1)Reset
f ree-run
select ref
(state 001)
(3) no valid standby ref
&
(main ref invalid
or out of lock >100s)
(2) all refs evaluated
&
at least one ref valid
Reference sources are flagged as 'val
active, 'in-band' and have no phase ala
(4) valid standby ref
&
[ main ref invalid or
(higher-priority ref valid
& in revertive mode) or
out of lock >100s]
pre-locked
w ait for up to 100s
(state 110)
(5) selected ref
phase locked
All sources are continuously checked
activity and frequency.
Only the main source is checked for p
A phase lock alarm is only raised on a
reference when that reference has los
whilst being used as the main referenc
micro-processor can reset the phase
alarm.
(10) selected source phase
locked
(9) valid standby ref
&
[ main ref invalid or
(higher-priority ref valid
& in revertive mode) ]
locked
keep ref
(state 100)
(8) phase
regained within
100s
(7) phase lost
on main ref
A source is considered to have phase
when it has been continuously in phas
for between 1 and 2 seconds
(6) no valid standby ref
&
main ref invalid
pre- loc ked2
w ait for up to 100s
(state 101)
(15) valid standby ref
&
[ main ref invalid or
(higher-priority ref valid
& in revertive mode) or
out of lock >100s]
(12) valid standby ref
&
(main ref invalid
or out of lock >100s)
Lost phase
w ait for up to 100s
(state 111)
(11) no valid standby ref
&
(main ref invalid
or out of lock >100s)
(13) no valid standby ref
&
(main ref invalid
or out of lock >100s)
(14) all refs evaluated
&
at least one ref valid
holdover
select ref
(state 010)
Revision 2.01/December 2005 Semtech Corp.
34
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