ZL30106_05 ZARLINK [Zarlink Semiconductor Inc], ZL30106_05 Datasheet - Page 24
![no-image](/images/no-image-200.jpg)
ZL30106_05
Manufacturer Part Number
ZL30106_05
Description
SONET/SDH/PDH Network Interface DPLL
Manufacturer
ZARLINK [Zarlink Semiconductor Inc]
Datasheet
1.ZL30106_05.pdf
(48 pages)
- Current page: 24 of 48
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4.5.2
In the automatic mode of operation (MODE_SEL1:0 = 11), the ZL30106 automatically selects a reference input that
is not out-of-range (REF_OOR=0, see Figure 3). The state machine can only select REF0 or REF1. REF2 cannot
be selected in the Automatic mode. See Figure 14.
If the current reference (REF0 or REF1) used for synchronization fails, the state machine will switch to the other
reference. If both references fail then the ZL30106 enters the Holdover mode without switching to another
reference. When the ZL30106 comes out of reset or when REF2 is the current reference when the ZL30106 is put
in the Automatic mode, then REF0 has priority over REF1. Otherwise there is no preference for REF0 or REF1
which is referred to as non-revertive reference selection.
REF_OOR = reference out of range, see Figure 3
Automatic Reference Switching
REF_SEL
LOCK
Note: LOCK pin behaviour depends on phase and frequency offset of REF1.
Figure 14 - Reference Selection in Automatic Mode (MODE_SEL=11)
Figure 13 - Reference Switching in Normal Mode
Reference
REF0
REF0
RST && REF_OOR0=0
Zarlink Semiconductor Inc.
REF1
REF_OOR0=0
REF_OOR0=0 &&
REF_OOR0=1 &&
ZL30106
REF_OOR1=1
REF_OOR1=0
Reference
REF2
24
Lock Time
REF_OOR0=1 && REF_OOR1=0
Reference
REF1
RST && REF_OOR0=1 && REF_OOR1=0
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