ZL50022
Data Sheet
Option 1
Free run
Ref 0 and 1 failed
Ref 0 valid
Ref 0 failed
Preferred
Ref 0
Start
Holdover 0
Ref 0 and 1 failed
Ref 1 failed or Ref 0 valid
Preferred References :
Ref 0
Ref 1
Holdover 1
Ref 1 valid
and Ref 0 failed
DPLL will switch between
Ref 0 and Ref 1
Ref 0 valid
Option 2
Ref 1 and 2 failed
Holdover 1
Ref 1 valid
Ref 1 failed
Preferred
Ref 1
Start
Free run
Ref 1 and 2 failed
Preferred References :
Ref 1
Ref 2 failed or Ref 1 valid
Ref 2 valid and Ref 1 failed
Ref 2
Holdover 2
DPLL will switch between
Ref 1 and Ref 2
Ref 1 valid
Option 3
Ref 2 and 3 failed
Holdover 2
Ref 2 valid
Ref 2 failed
Preferred
Ref 2
Start
Free run
Ref 2 and 3 failed
Ref 3 failed or Ref 2 valid
Preferred References :
Ref 2
Ref 3
Holdover 3
and Ref 2 failed
Ref 3 valid
Ref 2 valid
DPLL will switch between
Ref 2 and Ref 3
Option 4
Ref 0 and 3 failed
Holdover 3
Ref 0 and 3 failed
Ref 3 valid
Ref 3 failed
Preferred
Ref 3
Start
Free run
Preferred References :
Ref 3
Ref 0 failed or Ref 3 valid
and Ref 3 failed
Ref 0
Holdover 0
Ref 0 valid
Ref 3 valid
DPLL will switch between
Ref 3 and Ref 0
Note : other combinations not shown here are invalid settings and should not be used
Figure 22 - Automatic Reference Switching State Diagrams with Preferred Reference
42
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
