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參數(shù)資料
| 型號： | ZL50015QCC |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 路由/交換 |
| 英文描述： | Enhanced 1 K Digital Switch with Stratum 4E DPLL |
| 中文描述： | TELECOM, DIGITAL TIME SWITCH, PQFP256 |
| 封裝： | 28 X 28 MM, 1.40 MM HEIGHT, MS-026BJC, LQFP-256 |
| 文件頁數(shù)： | 44/122頁 |
| 文件大?。?/td> | 926K |
| 代理商： | ZL50015QCC |
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ZL50015
Data Sheet
44
Zarlink Semiconductor Inc.
15.0 DPLL Specific Functions and Requirements
15.1 Lock Detector
To determine if the DPLL is locked to the input clock, a lock detector monitors the phase value output of the phase
detector, which represents the difference between input reference and output feedback clock. If the phase value is
below a certain threshold for a certain interval, the DPLL is pronounced locked to the input clock. The monitoring is
done in intervals of 4 ms. The lock detector threshold and the interval are programmable by the user through the
Lock Detector Threshold Register (LDTR) and the Lock Detector Interval Register (LDIR) respectively. See
Table 31 on page 68 and Table 32 on page 68 for the bit descriptions of the Lock Detector Threshold Register
(LDTR) and Lock Detector Interval Register (LDIR) respectively. The value of the Lock Detector Threshold Register
(LDTR) should be programmed with respect to the maximum expected jitter frequency and amplitude on the
selected input references.
The lock status can be monitored through the Reference Change Status Register (RCSR). See Table 35 on
page 71 for the bit description of the Reference Change Status Register (RCSR).
15.2 Maximum Time Interval Error (MTIE)
Several standards require that the output clock of the DPLL may not move in phase more than a certain amount. In
order to meet those standards, a special circuit maintains the phase of the DPLL output clock during reference and
mode rearrangements. The total output phase change or Maximum Timing Interval Error (MTIE) during
rearrangements is less than 31 ns per rearrangement, exceeding Stratum 4E requirements. After a large number of
reference switches, the accumulated phase error can become significant, so it is recommended to use MTIE reset
in such situations, to realign outputs to the nearest edge of the selected reference. The MTIE reset can be
programmed by setting MTR (bit 7) in the Reference Change Control Register (RCCR), as described in Table 34 on
page 69.
15.3 Phase Alignment Speed (Phase Slope)
Besides total phase change, standards also require a certain rate of the phase change of the output clock. The
phase alignment speed is programmable by the user through a value in the Slew Rate Limit Register (SRLR) as
described in Table 33 on page 69. Stratum 4E requires that the phase alignment speed not exceed 81 ns per
1.326 ms (61ppm). The width of the register and the limiter circuitry provide a maximum phase change alignment
speed of 186 ppm. The phase alignment speed default value is 56 ppm.
15.4 Reference Monitoring
The quality of the four input reference clocks is continuously monitored by the reference monitors. There are
separate reference monitor circuits for the four DPLL references. References are checked for short phase (single
period) deviations as well as for frequency (multi-period) deviations with hysteresis.
The Reference Status Register (RSR) reports the status of the reference monitors. The register bits are described
in Table 39 on page 74. The Reference Mask Register (RMR) allows users to ignore the monitoring features of the
reference monitors. See Table 40 on page 75 for details.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL50015QCC1 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Enhanced 1 K Digital Switch with Stratum 4E DPLL |
| ZL50015QCG1 | 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:PB FREE 1K+RATE CONVERSION AND S4E DPLL 制造商:Microsemi Corporation 功能描述:PB FREE 1K+RATE CONVERSION AND S4E DPLL - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TDM SWITCH 1K-CH ENH 256LQFP 制造商:Microsemi Corporation 功能描述:IC TDM SWITCH 1K-CH ENH 256LQFP |
| ZL50016 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Enhanced 1 K Digital Switch |
| ZL50016_06 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Enhanced 1 K Digital Switch |
| ZL50016GAC | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 1K X 1K 1.8V/3.3V 256BGA - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TDM SWITCH 1K-CH ENH 256PBGA 制造商:Microsemi Corporation 功能描述:IC TDM SWITCH 1K-CH ENH 256PBGA |
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