zl50019gag2 Zarlink Semiconductor, zl50019gag2 Datasheet - Page 40
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zl50019gag2
Manufacturer Part Number
zl50019gag2
Description
Enhanced 2 K Digital Switch With Stratum 4e Dpll
Manufacturer
Zarlink Semiconductor
Datasheet
1.ZL50019GAG2.pdf
(121 pages)
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12.1.3.2
If a particular reference needs to have higher priority than the others, the device can be programmed in Automatic
mode with a preferred reference (RCCR Register, PMS2-0 bits = 001). When a preferred reference is selected, the
device can only switch automatically between two references, as shown in Table 8. The preferred reference will be
used as the primary reference and, by default, only its next consecutive reference will be used as the secondary
reference. No more than two references can be used in Automatic mode when a preferred reference is selected.
Figure 22 shows the state diagram for the four valid options of automatic reference switching with a preferred
reference.
Option 1
Option 2
Option 3
Option 4
Automatic Reference Switching With Preference
Table 8 - Preferred Reference Selection Options
Primary Reference (Preferred)
Ref 0
Ref 1
Ref 2
Ref 3
Zarlink Semiconductor Inc.
ZL50019
40
Secondary Reference
Ref 1
Ref 2
Ref 3
Ref 0
Data Sheet
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