參數(shù)資料
型號(hào)： IDT82V3255
廠商： Integrated Device Technology, Inc.
英文描述： WAN PLL
中文描述： 廣域網(wǎng)鎖相環(huán)
文件頁(yè)數(shù)： 21/127頁(yè)
文件大?。?/td> 868K
代理商： IDT82V3255
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IDT82V3255
WAN PLL
Functional Description
21
June 19, 2006
3.5.2
FREQUENCY MONITORING
Frequency is monitored by comparing the input clock with a refer-
ence clock. The reference clock can be derived from the master clock or
the output of T0 DPLL, as determined by the FREQ_MON_CLK bit.
A frequency hard alarm threshold is set for frequency monitoring. If
the FREQ_MON_HARD_EN bit is ‘1’, a frequency hard alarm is raised
when the frequency of the input clock with respect to the reference clock
is above the threshold; the alarm is cleared when the frequency is below
the threshold.
The frequency hard alarm threshold can be calculated as follows:
Frequency Hard Alarm Threshold (ppm) = (ALL_FREQ_HARD_
THRESHOLD[3:0] + 1) X FREQ_MON_FACTOR[3:0]
If the FREQ_MON_HARD_EN bit is ‘1’, the frequency hard alarm
status
of
the
input
clock
INn_CMOS_FREQ_HARD_ALARM bit (n = 1, 2 or 3) /
INn_DIFF_FREQ_HARD_ALARM bit (n = 1 or 2). When the
FREQ_MON_HARD_EN bit is ‘0’, no frequency hard alarm is raised
even if the input clock is above the frequency hard alarm threshold.
is
indicated
by
the
The input clock with a frequency hard alarm is disqualified for clock
selection for T0/T4 DPLL.
In addition, if the input clock is 2 kHz, 4 kHz or 8 kHz, its clock edges
with respect to the reference clock are monitored. If any edge drifts out-
side ±5%, the input clock is disqualified for clock selection for T0/T4
DPLL. The input clock is qualified if any edge drifts inside ±5%. This
function is supported only when the IN_NOISE_WINDOW bit is ‘1’.
The frequency of each input clock with respect to the reference clock
can be read by doing the following step by step:
1. Select an input clock by setting the IN_FREQ_READ_CH[3:0]
bits;
2. Read the value in the IN_FREQ_VALUE[7:0] bits and calculate
as follows:
Input Clock Frequency (ppm) = IN_FREQ_VALUE[7:0] X
FREQ_MON_FACTOR[3:0]
Note that the value set by the FREQ_MON_FACTOR[3:0] bits
depends on the application.
Table 5: Related Bit / Register in Chapter 3.5
Bit
Register
Address (Hex)
BUCKET_SIZE_n_DATA[7:0] (3
≥
n
≥
0)
UPPER_THRESHOLD_n_DATA[7:0] (3
≥
n
≥
0)
LOWER_THRESHOLD_n_DATA[7:0] (3
≥
n
≥
0)
DECAY_RATE_n_DATA[1:0] (3
≥
n
≥
0)
BUCKET_SIZE_0_CNFG ~ BUCKET_SIZE_3_CNFG
UPPER_THRESHOLD_0_CNFG ~ UPPER_THRESHOLD_3_CNFG
LOWER_THRESHOLD_0_CNFG ~ LOWER_THRESHOLD_3_CNFG
DECAY_RATE_0_CNFG ~ DECAY_RATE_3_CNFG
IN1_CMOS_CNFG, IN2_CMOS_CNFG, IN1_DIFF_CNFG,
IN2_DIFF_CNFG, IN3_CMOS_CNFG
33, 37, 3B, 3F
31, 35, 39, 3D
32, 36, 3A, 3E
34, 38, 3C, 40
BUCKET_SEL[1:0]
16, 17, 19, 1A, 1D
INn_CMOS_NO_ACTIVITY_ALARM (n = 1, 2, or 3)
INn_CMOS_FREQ_HARD_ALARM (n = 1, 2 or 3)
INn_DIFF_NO_ACTIVITY_ALARM (n = 1 or 2)
INn_DIFF_FREQ_HARD_ALARM (n = 1 or 2)
FREQ_MON_CLK
FREQ_MON_HARD_EN
ALL_FREQ_HARD_THRESHOLD[3:0]
FREQ_MON_FACTOR[3:0]
IN_NOISE_WINDOW
IN_FREQ_READ_CH[3:0]
IN_FREQ_VALUE[7:0]
IN1_IN2_CMOS_STS, IN3_CMOS_STS
44, 47
IN1_IN2_DIFF_STS
45
MON_SW_PBO_CNFG
0B
ALL_FREQ_MON_THRESHOLD_CNFG
FREQ_MON_FACTOR_CNFG
PHASE_MON_PBO_CNFG
IN_FREQ_READ_CH_CNFG
IN_FREQ_READ_STS
2F
2E
78
41
42
相關(guān)PDF資料
PDF描述
IDT82V3255DK WAN PLL
IDT82V3255DKG WAN PLL
IDT82V3255TF WAN PLL
IDT82V3255TFG WAN PLL
IDT82V3280 WAN PLL
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IDT82V3255_08 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:WAN PLL
IDT82V3255DK 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:WAN PLL
IDT82V3255DKG 功能描述:IC PLL WAN SMC STRATUM 3 64-TQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類型:時(shí)鐘緩沖器/驅(qū)動(dòng)器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT
IDT82V3255DKG8 功能描述:IC PLL WAN SMC STRATUM 3 64-TQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類型:時(shí)鐘緩沖器/驅(qū)動(dòng)器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT
IDT82V3255EDGBLANK 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:WAN PLL
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