zl50021 Zarlink Semiconductor, zl50021 Datasheet - Page 42

• Manufacturer Part Number: zl50021
• Description: Enhanced 4 K Digital Switch With Stratum 3 Dpll
• Manufacturer: Zarlink Semiconductor

Note: other combinations not shown here are invalid settings and should not be used
Option 4
Option 3
Preferred References:
Preferred References:
Ref 2
DPLL will switch between
Ref 2 and Ref 3
Ref 3
DPLL will switch between
Ref 3 and Ref 0
Option 2
Preferred References:
Ref 1
DPLL will switch between
Ref 1 and Ref 2
Option 1
Preferred References:
Ref 0
DPLL will switch between
Ref 0 and Ref 1
Figure 22 - Automatic Reference Switching State Diagrams with Preferred Reference
Free run
Free run
Free run
Free run
Start
Start
Start
Start
Holdover 1
Holdover 1
Holdover 2
Holdover 3
Holdover 0
Holdover 0
Holdover 3
Holdover 2
Ref 0 valid
Ref 0 and 3 failed
Ref 1 and 2 failed
Ref 0 and 3 failed
Zarlink Semiconductor Inc.
Ref 0 and 1 failed
Ref 0 and 1 failed
Ref 2 and 3 failed
Ref 1 and 2 failed
Ref 1 valid
Ref 2 and 3 failed
Ref 2 valid
Ref 3 valid
ZL50021
Ref 2 valid
Ref 1 valid
42
Ref 1 failed or Ref 0 valid
Ref 2 failed or Ref 1 valid
Ref 3 valid
Ref 0 failed or Ref 3 valid
Ref 0 valid
Ref 3 failed or Ref 2 valid
and Ref 0 failed
and Ref 1 failed
and Ref 2 failed
and Ref 3 failed
Ref 2 failed
Ref 2 valid
Ref 1 failed
Ref 1 valid
Ref 3 failed
Ref 0 valid
Ref 3 valid
Ref 0 failed
Preferred
Preferred
Preferred
Preferred
Ref 1
Ref 2
Ref 2
Ref 3
Ref 3
Ref 0
Ref 1
Ref 0
Data Sheet