ds3102 Maxim Integrated Products, Inc., ds3102 Datasheet - Page 58

• Manufacturer Part Number: ds3102
• Description: Stratum 3 Timing Card Ic With Synchronous Ethernet Support
• Manufacturer: Maxim Integrated Products, Inc.

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 7: Phase Alarm (PALARM). This real-time status bit indicates the state of the T0 DPLL phase-lock detector.
See Section 7.7.6. (Note: This is not the same as T0STATE = locked.)
Bit 6: Disable 180 (D180). When locking to a new reference, the T0 DPLL first tries nearest edge locking (±180°)
for the first two seconds. If unsuccessful it then tries full phase/frequency locking (±360°). Disabling the nearest
edge locking can reduce lock time by up to two seconds but may cause an unnecessary phase shift (up to 360°)
when the new reference is close in frequency/phase to the old reference. See Section 7.7.5.
Bit 4: Resync Analog Dividers (RA). When this bit is set the analog output dividers are always synchronized to
ensure that low-frequency outputs are in sync with the higher frequency clock from the DPLL.
Bits 3, 1, and 0: Leave set to zero (test control).
Bit 2: 8kHz Edge Polarity (8KPOL). Specifies the input clock edge to lock to on the selected reference when it is
configured for LOCK8K mode. See Section 7.4.2.
Rev: 012108
____________________________________________________________________________________________ DS3102
0 = T0 DPLL phase-lock parameters are met (FLEN, CLEN, NALOL, FLLOL)
1 = T0 DPLL loss-of-phase lock
0 = Normal operation: try nearest edge locking then phase/frequency locking
1 = Phase/frequency locking only
0 = Synchronized for the first two seconds after power-up
1 = Always synchronized
0 = Falling edge
1 = Rising edge
PALARM
7
0
D180
6
0
TEST1
Test Register 1 (Not Normally Used)
03h
—
5
0
RA
4
1
3
0
0
8KPOL
2
1
1
0
0
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0
0
0