ACS8510 datasheet(44/69 Pages) SEMTECH

44 / 69 page

Revision 2.07/Jan 2001 ã2001 Semtech Corp

www.semtech.com

ACS8510 SETS

ADVANCED COMMUNCIATIONS

FINAL

Figure 8: Automatic Mode Control State Diagram.

pre-locked

w ait for up to 100s

(state 110)

locked

keep ref

(state 100)

holdover

select ref

(state 010)

(2) all refs evaluated

at least one ref valid

(5) selected ref

phase locked

(3) no valid standby ref

(main ref invalid

or out of lock >100s)

(14) all refs evaluated

at least one ref valid

pre-locked2

w ait for up to 100s

(state 101)

(10) selected source phase

locked

(6) no valid standby ref

main ref invalid

free-run

select ref

(state 001)

(1)Reset

Reference sources are flagged as ’valid’ when

active, ’in-band’ and have no phase alarm set.

All sources are continuously checked for

activity and frequency.

Only the main source is checked for phase.

A phase lock alarm is only raised on a

reference when that reference has lost phase

whilst being used as the main reference. The

micro-processor can reset the phase lock

alarm.

A source is considered to have phase locked

when it has b een continuously in phase lock

for between 1 and 2 seconds

Lost phase

w ait for up to 100s

(state 111)

(7) phase lost

on main ref

(8) phase

regained within

100s

(12) valid standby ref

(main ref invalid

or out of lock >100s)

(13) no valid standby ref

(main ref invalid

or out of lock >100s)

(11) no valid standby ref

(main ref invalid

or out of lock >100s)

(9) valid standby ref

[ main ref invalid or

(higher-priority ref valid

& in revertive mode) ]

(15) valid standby ref

[ main ref invalid or

(higher-priority ref valid

& in revertive mode) or

out of lock >100s]

(4) valid standby ref

[ main ref invalid or

(higher-priority ref valid

& in revertive mode) or

out of lock >100s]

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