ACS8520T Semtech, ACS8520T Datasheet - Page 64

• Manufacturer Part Number: ACS8520T
• Description: Synchronous Equipment Timing Source (SETS) for Stratum 3/4E/4 and SMC Systems
• Manufacturer: Semtech

Address (hex):
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Register Name
SYNC2K_alarm T4_DPLL_Lock
Bit No.
Bit 7
[2:0]
5
4
3
09 (cont...)
sts_operating
Description
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.
Bit 6
T0_DPLL_freq_
soft_alarm
Bit 5
Description
T4_DPLL_freq_
soft_alarm
Bit 4
FINAL
Page 64
(RO) Current operating state of
the device’s internal state
machine.
Bit Value
Bit 3
000
001
010
011
100
101
110
111
0
1
0
1
-
Value Description
T0 DPLL tracking its reference within the limits of
the programmed “soft” alarm.
T0 DPLL tracking its reference beyond the limits of
the programmed “soft” alarm.
T4 DPLL tracking its reference within the limits of
the programmed “soft” alarm.
T4 DPLL tracking its reference beyond the limits of
the programmed “soft” alarm.
-
Not used.
Free Run.
Holdover.
Not used.
Locked.
Pre-locked2.
Pre-locked.
Phase Lost.
Bit 2
T0_DPLL_operating_mode
Default Value
ACS8520 SETS
Bit 1
DATASHEET
www.semtech.com
0100 0001
Bit 0