參數(shù)資料
型號(hào)： ZL30106
廠商： Zarlink Semiconductor Inc.
英文描述： SONET/SDH/PDH Network Interface DPLL
中文描述： 的SONET / SDH / PDH數(shù)字網(wǎng)絡(luò)接口全數(shù)字鎖相環(huán)
文件頁(yè)數(shù)： 21/48頁(yè)
文件大?。?/td> 423K
代理商： ZL30106
ZL30106
Data Sheet
21
Zarlink Semiconductor Inc.
4.3 Output Clock and Frame Pulse Selection
The output of the DCO is used by the frequency synthesizers to generate the output clocks and frame pulses which
are synchronized to one of three reference inputs (REF0, REF1 or REF2). These signals are available in two
groups controlled by the OUT_SEL2:0 pins, see Table 3.
4.4 Modes of Operation
The ZL30106 has three possible manual modes of operation; Normal, Holdover and Freerun. These modes are
selected with mode select pins MODE_SEL1 and MODE_SEL0 as is shown in Table 4. Transitioning from one
mode to the other is controlled by an external controller. The ZL30106 can be configured to automatically select a
valid input reference under control of its internal state machine by setting MODE_SEL1:0 = 11. In this mode of
operation, a state machine controls selection of references (REF0 or REF1) used for synchronization.
4.4.1 Freerun Mode
Freerun mode is typically used when an independent clock source is required or immediately following system
power-up before network synchronization is achieved.
In Freerun mode, the ZL30106 provides timing and synchronization signals which are based on the master clock
frequency (supplied to OSCi pin) only and are not synchronized to the reference input signals.
The accuracy of the output clock is equal to the accuracy of the master clock (OSCi). So if a
±
32 ppm output clock
is required, the master clock must also be
±
32 ppm. See Applications - Section 6.2, “Master Clock“.
OUT_SEL2
Generated Clocks
Generated Frame Pulses
0
C2o, C4o, C8o, C16o
F4o, F8o, F16o
1
C2o, C16o, C32, C65o
F16o, F32o, F65o
OUT_SEL1:0
00
C6o
01
C8.4o
10
C34o
11
C44o
Table 3 - Clock and Frame Pulse Selection with OUT_SEL Pin
MODE_SEL1
MODE_SEL0
Mode
0
0
Normal (with automatic Holdover)
0
1
Holdover
1
0
Freerun
1
1
Automatic
(Normal with automatic Holdover and
automatic reference switching)
Table 4 - Operating Modes
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