- 您现在的位置：买卖IC网 > PDF目录377488 > IDT82V3255DK (INTEGRATED DEVICE TECHNOLOGY INC) WAN PLL PDF资料下载
参数资料
| 型号： | IDT82V3255DK |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 通信及网络 |
| 英文描述： | WAN PLL |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 20/127页 |
| 文件大小： | 868K |
| 代理商： | IDT82V3255DK |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页
IDT82V3255
WAN PLL
Functional Description
20
June 19, 2006
3.5
INPUT CLOCK QUALITY MONITORING
The qualities of all the input clocks are always monitored in the fol-
lowing aspects:
Activity
Frequency
The qualified clocks are available for T0/T4 DPLL selection. The T0
and T4 selected input clocks have to be monitored further. Refer to
Chapter 3.7 Selected Input Clock Monitoring
for details.
3.5.1
ACTIVITY MONITORING
Activity is monitored by using an internal leaky bucket accumulator,
as shown in
Figure 4
.
Each input clock is assigned an internal leaky bucket accumulator.
The input clock is monitored for each period of 128 ms and the internal
leaky bucket accumulator increases by 1 when an event is detected; it
decreases by 1 if no event is detected within the period set by the decay
rate. The event is that an input clock drifts outside (>) ±500 ppm with
respect to the master clock within a 128 ms period.
There are four configurations (0 - 3) for a leaky bucket accumulator.
The leaky bucket configuration for an input clock is selected by the cor-
responding BUCKET_SEL[1:0] bits. Each leaky bucket configuration
consists of four elements: upper threshold, lower threshold, bucket size
and decay rate.
The bucket size is the capability of the accumulator. If the number of
the accumulated events reach the bucket size, the accumulator will stop
increasing even if further events are detected. The upper threshold is a
point above which a no-activity alarm is raised. The lower threshold is a
point below which the no-activity alarm is cleared. The decay rate is a
certain period during which the accumulator decreases by 1 if no event
is detected.
The leaky bucket configuration is programmed by one of four groups
of register bits: the BUCKET_SIZE_n_DATA[7:0]
bits,
the
UPPER_
THRESHOLD_n_DATA[7:0]
bits,
DATA[7:0] bits and the DECAY_RATE_n_DATA[1:0] bits respectively; ‘n’
is 0 ~ 3.
the
LOWER_THRESHOLD_n_
The no-activity alarm status of the input clock is indicated by the
INn_CMOS_NO_ACTIVITY_ALARM bit (n = 1, 2, or 3) /
INn_DIFF_NO_ACTIVITY_ALARM bit (n = 1 or 2).
The input clock with a no-activity alarm is disqualified for clock selec-
tion for T0/T4 DPLL.
Figure 4. Input Clock Activity Monitoring
Input Clock
Leaky Bucket Accumulator
No-activity Alarm Indication
Decay
Rate
Bucket Size
Upper Threshold
Lower Threshold
0
clock signal with no event
clock signal with events
相关PDF资料 |
PDF描述 |
|---|---|
| IDT82V3255DKG | WAN PLL |
| IDT82V3255TF | WAN PLL |
| IDT82V3255TFG | WAN PLL |
| IDT82V3280 | WAN PLL |
| IDT82V3280DQ | WAN PLL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT82V3255DKG | 功能描述:IC PLL WAN SMC STRATUM 3 64-TQFP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| IDT82V3255DKG8 | 功能描述:IC PLL WAN SMC STRATUM 3 64-TQFP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| IDT82V3255EDGBLANK | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:WAN PLL |
| IDT82V3255TF | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:WAN PLL |
| IDT82V3255TFBLANK | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:WAN PLL |
发布紧急采购，3分钟左右您将得到回复。