参数资料
型号: ZL30402/QCG1
厂商: ZARLINK SEMICONDUCTOR INC
元件分类: 数字传输电路
英文描述: ATM/SONET/SDH SUPPORT CIRCUIT, PQFP80
封装: 14 X 14 MM, 1.40 MM HEIGHT, LEAD FREE, MS-026BEC, LQFP-80
文件页数: 15/44页
文件大小: 472K
代理商: ZL30402/QCG1
ZL30402
Data Sheet
22
Zarlink Semiconductor Inc.
Address: 01 H
Address: 04 H
Bit
Name
Functional Description
7RSV
Reserved.
6RSV
Reserved.
5LOCK
Lock. This bit goes high when the Core PLL is locked to the selected Acquisition
PLL.
4
HOLDOVER
Holdover. This bit goes high when the Core PLL enters Holdover mode. Detection
of reference failure and subsequent transition from Normal to Holdover state takes
approximately: 0.750
s for 19.44 MHz reference, 0.850 s for 2.048 MHz
reference, 1.1
s for 1.544 MHz reference and 130 s for 8 kHz reference.
3RSV
Reserved.
2FLIM
Frequency Limit. This bit goes high when the Core PLL is pulled by the input
reference signal to the edge of its frequency tracking range set at ±104 ppm. This
bit may change state momentarily in the event of large jitter or wander excursions
occurring when the input reference is close to the frequency limit range.
1RSV
Reserved.
0RSV
Reserved.
Table 6 - Status Register 1 (R)
Bit
Name
Functional Description
Default
7
E3DS3/OC3
E3, DS3 or OC-3 clock select. Setting this bit to zero enables the
C155P/N outputs (pin 30 and pin 31) and enables the C34/C44 output
(pin 53) to provide C8 or C11 clocks. Logic high sets the C155 clock
outputs into high impedance and enables the C34/C44 output to
provide a C34 or C44 clock.
0
6E3/DS3
E3 or DS3 clock select. When E3DS3/OC3 bit is set high, a logic
low on the E3/DS3 bit selects a 44.736 MHz clock on the C34/C44
output and logic high selects a 34.368 MHz clock. When the
E3DS3/OC3 bit is set low, a logic low on the E3/DS3 bit selects an
11.184 MHz clock on the C34/C44 output and a logic high selects
an 8.592 MHz clock.
0
5-0
RSV
Reserved.
000000
Table 7 - Control Register 2 (R/W)
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