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參數(shù)資料
| 型號： | ZL30410 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | CONN HDR INVERSE 30POS 5ROW VERT |
| 中文描述： | 多業(yè)務(wù)線卡鎖相環(huán) |
| 文件頁數(shù)： | 19/38頁 |
| 文件大?。?/td> | 400K |
| 代理商： | ZL30410 |
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ZL30410
Data Sheet
19
Zarlink Semiconductor Inc.
4.1.4 Dual Reference Operation: NORMAL --> AUTO HOLDOVER--> HOLDOVER --> NORMAL
The NORMAL to AUTO-HOLDOVER to HOLDOVER to NORMAL sequence represents the most likely operation of
the ZL30410.
The sequence starts from the Normal state and transitions to Auto Holdover state due to an unforeseen loss of
reference. The failure conditions triggering this transition were described in section 4.1.2. When in the Auto
Holdover state, the ZL30410 can return to Normal mode automatically if the lost reference is restored. This
transition from Auto Holdover to Normal mode is performed as “hit-less” recovery for 1.544 MHz, 2.048 MHz and
19.44 MHz references. For the 8 kHz input reference, the recovery from Auto Holdover state must transition
through the Holdover state to guarantee “hit-less” recovery (for details see section 4.1.3 on page 18). If the
reference clock failure persists for a period of time that exceeds the system design limit, the system control
processor may initiate a reference switch. If the secondary reference is available the ZL30410 will briefly switch into
Holdover mode and then transition to Normal mode.
Figure 11 - Entry into Auto Holdover state and recovery into Normal mode by switching
references
The new reference clock will most likely have a different phase but it may also have a different fractional frequency
offset. In order to lock to a new reference with a different frequency, the Core PLL may be stepped gradually
towards the new frequency.
Ref: OK AND
MS2,MS1=00
{AUTO}
Ref: OK-->FAIL AND
MS2,MS1=00
{AUTO}
MS2,MS1=01 OR
RefSel change
MS2,MS1=10 forces
unconditional return from
any state to Free-run
RESET=1
MS2,MS1=00
OR
MS2,MS1=01
RefSel Change
OR
MS2,MS1=01
Ref: FAIL-->OK AND
MS2,MS1=00
{AUTO}
RESET
FREE-
RUN
10
HOLD-
OVER
01
NORMAL
00
AUTO
HOLD-
OVER
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相關(guān)代理商/技術(shù)參數(shù) |
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| ZL30410_06 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-service Line Card PLL |
| ZL30410QCC | 制造商:Microsemi Corporation 功能描述:PLL CLOCK GEN SGL UP TO 19.44MHZ 80LQFP EP - Trays |
| ZL30410QCC1 | 制造商:Microsemi Corporation 功能描述: |
| ZL30410QCG1 | 制造商:Microsemi Corporation 功能描述:IC SONET/SDH NETWORK ELEMENT PLL 制造商:Microsemi Corporation 功能描述:LEAD FREE SONET/SDH NETWORK ELEMENT PLL - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC PLL SONET/SDH/PDH 80LQFP 制造商:Microsemi Corporation 功能描述:IC PLL SONET/SDH/PDH 80LQFP |
| ZL30414 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH Clock Multiplier PLL |
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