參數資料
型號: IDT82V3288BC
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 通信及網絡
英文描述: WAN PLL
中文描述: SPECIALTY TELECOM CIRCUIT, PBGA208
封裝: PLASTIC, CABGA-208
文件頁數: 104/170頁
文件大?。?/td> 1053K
代理商: IDT82V3288BC
IDT82V3288
WAN PLL
Programming Information
104
June 22, 2006
7.2.4
INPUT CLOCK QUALITY MONITORING CONFIGURATION & STATUS REGISTERS
FREQ_MON_FACTOR_CNFG - Factor of Frequency Monitor Configuration
ALL_FREQ_MON_THRESHOLD_CNFG - Frequency Monitor Threshold for All Input Clocks Configuration
Address: 2EH
Type: Read / Write
Default Value: XXXX1011
Bit
Name
Description
7 - 4
-
Reserved.
These bits determine a factor. The factor has a relationship with the frequency hard alarm threshold in ppm (refer to
the description of the ALL_FREQ_HARD_THRESHOLD[3:0] bits (b3~0, 2FH)) and with the frequency of the input
clock with respect to the master clock in ppm (refer to the description of the IN_FREQ_VALUE[7:0] bits (b7~0, 42H)).
The factor represents the accuracy of the frequency monitor and should be set according to the requirements of differ-
ent applications.
0000: 0.0032.
0001: 0.0064.
0010: 0.0127.
0011: 0.0257.
0100: 0.0514.
0101: 0.103.
0110: 0.206.
0111: 0.412.
1000: 0.823.
1001: 1.646.
1010: 3.292.
1011: 3.81. (default)
1100 - 1111: 4.6.
3 - 0
FREQ_MON_FACTOR[3:0]
Address: 2FH
Type: Read / Write
Default Value: XXXX0011
Bit
Name
Description
7 - 4
-
Reserved.
These bits represent an unsigned integer. The frequency hard alarm threshold in ppm can be calculated as
follows:
Frequency Hard Alarm Threshold (ppm) = (ALL_FREQ_HARD_THRESHOLD[3:0] + 1) X
FREQ_MON_FACTOR[3:0] (b3~0, 2EH)
This threshold is symmetrical about zero.
3 - 0
ALL_FREQ_HARD_THRESHOLD[3:0]
7
6
5
4
3
2
1
0
-
-
-
-
FREQ_MON_F
ACTOR3
FREQ_MON_F
ACTOR2
FREQ_MON_F
ACTOR1
FREQ_MON_F
ACTOR0
7
6
5
4
3
2
1
0
-
-
-
-
ALL_FREQ_HARD_
THRESHOLD3
ALL_FREQ_HARD_
THRESHOLD2
ALL_FREQ_HARD_
THRESHOLD1
ALL_FREQ_HARD_
THRESHOLD0
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