ZL50022GAC ZARLINK [Zarlink Semiconductor Inc], ZL50022GAC Datasheet - Page 41

Manufacturer Part Number

ZL50022GAC

Description

Enhanced 4 K Digital Switch with Stratum 4E DPLL

Manufacturer

ZARLINK [Zarlink Semiconductor Inc]

Datasheet

1.ZL50022GAC.pdf (121 pages)

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 Preferences

Table 8 - Preferred Reference Selection Options

Primary Reference (Preferred)

Ref 0

Ref 1

Ref 2

Ref 3

Zarlink Semiconductor Inc.

ZL50022

Secondary Reference

Ref 1

Ref 2

Ref 3

Ref 0

Data Sheet