參數(shù)資料
型號: ZL50018GAC
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 路由/交換
英文描述: 2 K Digital Switch with Enhanced Stratum 3 DPLL
中文描述: TELECOM, DIGITAL TIME SWITCH, PBGA256
封裝: 17 X 17 MM, 1.61 MM HEIGHT, PLASTIC, MS-034, BGA-256
文件頁數(shù): 71/136頁
文件大?。?/td> 1448K
代理商: ZL50018GAC
ZL50018
Data Sheet
71
Zarlink Semiconductor Inc.
Bit
Name
Description
15
Unused
Reserved.
In normal functional mode, this bit is zero.
14 - 0
FOF14 - 0
Frequency Offset Bits:
The binary value of these bits represents the current deviation
of the DPLL output from its center frequency. Defined in same units as CFN in the 2's
complement format.
In the software fast mode these bits do not represent frequency offset since the internal
filter and phase alignment speed (phase slope) limiter are not used.
Note: Note 1: Output frequency offset, relative to master clock, will be represented as the following:
+10 ppm: CFN x 0.00001 = 440 = 01B8
-10 ppm: CFN x (-0.00001) = -440 = 7E48
H
Table 34 - Frequency Offset Register (FOR) Bits - Read Only
Bit
Name
Description
15 - 14
Unused
Reserved.
In normal functional mode, these bits
MUST
be set to zero.
13 - 0
FLR13 - 0
Frequency Lock Range Bits:
If not in the limiter bypass mode, the binary value of these
bits defines the maximum allowed deviation of the DPLL output from its center frequency.
If the DPLL limiter bypass is set in the Bandwidth Control Register, the DPLL output fre-
quency can exceed the value specified by these bits, since the proportional value of ref-
erence-to-feedback difference is predominant to the integration value in that case.
Defined in same units as CFN (unsigned).
Note: The default value is
±
20 ppm (’h0370/CFN = 20 ppm).
Table 35 - Frequency Locking Range Register (FLRR) Bits
External Read Only Address: 0045
H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
FOF
14
FOF
13
FOF
12
FOF
11
FOF
10
FOF
9
FOF
8
FOF
7
FOF
6
FOF
5
FOF
4
FOF
3
FOF
2
FOF
1
FOF
0
External Read/Write Address: 0046
H
Reset Value: 0370
H
(see Note)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
FLR
13
FLR
12
FLR
11
FLR
10
FLR
9
FLR
8
FLR
7
FLR
6
FLR
5
FLR
4
FLR
3
FLR
2
FLR
1
FLR
0
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