参数资料
型号: SI5374B-A-GL
厂商: SILICON LABORATORIES
元件分类: 时钟产生/分配
英文描述: 808 MHz, PROC SPECIFIC CLOCK GENERATOR, PBGA80
封装: 10 X 10 MM, ROHS COMPLIANT, PLASTIC, MO-192, BGA-80
文件页数: 20/64页
文件大小: 303K
代理商: SI5374B-A-GL
Si5374
Preliminary Rev. 0.4
27
Reset value = 0010 1100
Register 19.
Bit
D7
D6D5D4
D3D2D1
D0
Name
FOS_EN
FOS_THR [1:0]
VALTIME [1:0]
LOCKT [2:0]
Type
R/W
Bit
Name
Function
7:5
FOS_EN
FOS_EN.
Frequency Offset Enable globally disables FOS. See the individual FOS enables
(FOSX_EN, register 139).
0: FOS disable
1: FOS enabled by FOSx_EN
6:5
FOS_THR [1:0] FOS_THR [1:0].
Frequency Offset at which FOS is declared:
00: ± 11 to 12 ppm (Stratum 3/3E compliant, with a Stratum 3/3E used for REFCLK.
01: ± 48 to 49 ppm SONET Minimum Clock (SMC) with SMC used for REFCLK.
10: ± 30 ppm (SONET Minimum Clock (SMC), with a Stratum 3/3E used for REFCLK.
11: ± 200 ppm
4:3
VALTIME [1:0] VALTIME [1:0].
Sets amount of time for input clock to be valid before the associated alarm is removed.
00: 2 ms
01: 100 ms
10: 200 ms
11: 13 seconds
2:0
LOCKT [2:0]
LOCKT [2:0].
Sets retrigger interval for one shot monitoring phase detector output. One shot is trig-
gered by phase slip in DSPLL. To minimize lock time during an ICAL, a LOCKT value of
001 is recommended. Refer to the Family Reference Manual for more details.
000: 106 ms
001: 53 ms
010: 26.5 ms
011: 13.3 ms
100: 6.6 ms
101: 3.3 ms
110: 1.66 ms
111: 0.833 ms
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