ACS8520 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8520' PDF : 150 Pages View PDF
ACS8520 SETS
ADVANCED COMMUNICATIONS
Address (hex): 09 (cont...)
Register Name sts_operating
FINAL
Description
(RO) Current operating state of
the device’s internal state
machine.
DATASHEET
Default Value 0100 0001
Bit 7
Bit 6
Bit 5
Bit 4
SYNC2K_alarm T4_DPLL_Lock T0_DPLL_freq_ T4_DPLL_freq_
soft_alarm
soft_alarm
Bit 3
Bit 2
Bit 1
Bit 0
T0_DPLL_operating_mode
Bit No.
Description
Bit Value Value Description
5
4
3
[2:0]
T0_DPLL_freq_soft_alarm
The T0 DPLL has a programmable frequency limit
and “soft” alarm limit. The frequency limit is the
extent to which it will track a reference before
limiting. The “soft” limit is the point beyond which
the DPLL tracking a reference will cause an alarm.
This bit reports the status of the “soft” alarm.
T4_DPLL_freq_soft_alarm
The T4 DPLL has a programmable frequency limit
and “soft” alarm limit. The frequency limit is the
extent to which it will track a reference before
limiting. The “soft” limit is the point beyond which
the DPLL tracking a reference will cause an alarm.
This bit reports the status of the “soft” alarm.
Not used.
T0_DPLL_operating_mode
This field is used to report the state of the internal
finite state machine controlling the T0 DPLL.
0
T0 DPLL tracking its reference within the limits of
the programmed “soft” alarm.
1
T0 DPLL tracking its reference beyond the limits of
the programmed “soft” alarm.
0
T4 DPLL tracking its reference within the limits of
the programmed “soft” alarm.
1
T4 DPLL tracking its reference beyond the limits of
the programmed “soft” alarm.
-
-
000
Not used.
001
Free Run.
010
Holdover.
011
Not used.
100
Locked.
101
Pre-locked2.
110
Pre-locked.
111
Phase Lost.
Revision 3.02/October 2005 © Semtech Corp.
Page 64
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