參數(shù)資料
型號(hào): ZL50015GAC
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 路由/交換
英文描述: Enhanced 1 K Digital Switch with Stratum 4E DPLL
中文描述: TELECOM, DIGITAL TIME SWITCH, PBGA256
封裝: 17 X 17 MM, 1.61 MM HEIGHT, PLASTIC, MS-034, BGA-256
文件頁數(shù): 40/122頁
文件大小: 926K
代理商: ZL50015GAC
ZL50015
Data Sheet
40
Zarlink Semiconductor Inc.
12.1.3.2 Automatic Reference Switching With Preferences
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.
Primary Reference (Preferred)
Secondary Reference
Option 1
Ref 0
Ref 1
Option 2
Ref 1
Ref 2
Option 3
Ref 2
Ref 3
Option 4
Ref 3
Ref 0
Table 8 - Preferred Reference Selection Options
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