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参数资料
| 型号： | ZL30402/QCC1 |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PQFP80 |
| 封装： | 14 X 14 MM, 1.40 MM HEIGHT, MS-026BEC, LQFP-80 |
| 文件页数： | 24/44页 |
| 文件大小： | 472K |
| 代理商： | ZL30402/QCC1 |
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ZL30402
Data Sheet
30
Zarlink Semiconductor Inc.
5.1.3
Dual Reference Operation: NORMAL --> AUTO HOLDOVER--> HOLDOVER --> NORMAL
The NORMAL to AUTO-HOLDOVER to HOLDOVER to NORMAL sequence represents the most likely operation of
ZL30402 in Network Equipment.
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 ZL30402 can return to Normal mode automatically if the lost reference is restored and the
ADHR bit is set to 0. 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 ZL30402
will briefly switch into Holdover mode and then transition to Normal mode.
Figure 9 - 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. The frequency slope will be limited to less than 2.0 ppm/sec.
NORMAL
(LOCKED)
00
AUTO
HOLD-
OVER
HOLD-
OVER
01
FREE-
RUN
10
RESET
Ref: OK &
MS2, MS1 == 00
{AUTO}
Ref: OK --> FAIL &
MS2, MS1 == 00
{AUTO}
MS2, MS1 == 01 OR
RefSel change
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=1 &
MHR= 0-->1 then 1-->0
{MANUAL}
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=0
{AUTO}
MS2, MS1 == 10 forces
unconditional return from
any state to Free-run
MS2, MS1! = 10
RESET == 1
RefSel Change
AHRD=0
(automatic return enabled)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL30402QCG1 | 制造商:Microsemi Corporation 功能描述:PB FREE SONET / SDH NETWORK ELEMENT PLL - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC NETWORK PLL SONET/SDH 80LQFP 制造商:Microsemi Corporation 功能描述:IC NETWORK PLL SONET/SDH 80LQFP |
| ZL30406 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:SONET/SDH Clock Multiplier PLL |
| ZL30406_06 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:SONET/SDH Clock Multiplier PLL |
| ZL30406QGC | 制造商:Zarlink Semiconductor Inc 功能描述:PLL CLOCK MLTPLR SGL UP TO 19.44MHZ 64TQFP - Trays |
| ZL30406QGC1 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:SONET/SDH Clock Multiplier PLL |
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