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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： | 20/44页 |
| 文件大小： | 472K |
| 代理商： | ZL30402/QCG1 |
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ZL30402
Data Sheet
27
Zarlink Semiconductor Inc.
Address: 28 H
Address: 40 H
Address: 41 H
Address: 42 H
Bit
Name
Functional Description
7-5
RSV
Reserved.
4-3
InpFreq1-0
Input Frequency. These two bits identify the Secondary Reference Clock frequency.
- 00 = 19.44 MHz
- 01 = 8 kHz
- 10 = 1.544 MHz
- 11 = 2.048 MHz
2RSV
Reserved.
1
SAH
Secondary Acquisition PLL Holdover. This bit goes high whenever the Acquisition PLL
enters Holdover mode. Holdover mode is entered when reference frequency is:
- lost completely
- drifts more than ±30 000 ppm off the nominal frequency
- a large phase hit occurs on the reference clock.
0
SAFL
Secondary Acquisition PLL Frequency Limit. This bit goes high whenever the Acquisition
PLL exceeds its capture range of ±104 ppm. This bit can flicker high in the event of a large
excursion of still tolerable input jitter.
Table 17 - Secondary Acquisition PLL Status Register (R)
Bit
Name
Functional Description
Default
7-0
MCFC31 - 24
Master Clock Frequency Calibration. This most significant byte contains the
31st to 24th bit of the Master Clock Frequency Calibration Register. See
Applications section 4.2 for a detailed description of how to calculate the MCFC
value.
00000
000
Table 18 - Master Clock Frequency Calibration Register 4 (R/W)
Bit
Name
Functional Description
Default
7-0
MCFC23 - 16
Master Clock Frequency Calibration. This byte contains the 23rd
to 16th bit of the Master Clock Frequency Calibration Register.
00000
000
Table 19 - Master Clock Frequency Calibration Register 3 (R/W)
Bit
Name
Functional Description
Default
7-0
MCFC15 - 8
Master Clock Frequency Calibration. This byte contains the 15th
to 8th bit of the Master Clock Frequency Calibration Register.
00000
000
Table 20 - Master Clock Frequency Calibration Register 2 (R/W)
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