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ACS8525P Datasheet(PDF) 10 Page - Semtech Corporation |
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ACS8525P Datasheet(HTML) 10 Page - Semtech Corporation |
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10 / 112 page  ADVANCED COMMUNICATIONS FINAL DATASHEET Revision 3.01/August 2005 © Semtech Corp. Page 10 www.semtech.com ACS8525 LC/P dynamics between the selected clock and the other reference clocks. Anomalies occurring on non-selected SECs affect only that source's suitability for selection, whereas anomalies occurring on the selected clock could have a detrimental impact on the accuracy of the output clock. Leaky Bucket Accumulator Anomalies detected by the Activity Monitor are integrated in a Leaky Bucket Accumulator. There is one Leaky Bucket Accumulator per SEC input. Each Leaky Bucket can be programmed with a Bucket ID (0 to 3) which assigns to the Leaky Bucket the corresponding Leaky Bucket Configuration (from four available Configurations). Each Leaky Bucket Configuration comprises the following programmable parameters (See Reg. 50 to Reg. 5F): Bucket size Alarm trigger (set threshold) Alarm clear (reset threshold) Leak rate (decay rate) There are occasional anomalies that do not cause the Accumulator to cross the alarm setting threshold, so the selected SEC is retained. Persistent anomalies cause the alarm setting threshold to be crossed and result in the selected SEC being rejected. Each Leaky Bucket Accumulator is a digital circuit which mimics the operation of an analog integrator. If several events occur close together, each event adds to the amplitude and the alarm will be triggered quickly; if events occur over a greater time period but still sufficiently close together to overcome the decay, the alarm will be triggered eventually. If events occur at a rate which is not sufficient to overcome the decay, the alarm will not be triggered. Similarly, if no defect events occur for a sufficient time, the amplitude will decay gradually and the alarm will be cleared when the amplitude falls below the alarm clearing threshold. The ability to decay the amplitude over time allows the importance of defect events to be reduced as time passes by. This means that, in the case of isolated events, the alarm will not be set, whereas, once the alarm becomes set, it will be held on until normal operation has persisted for a suitable time (but if the operation is still erratic, the alarm will remain set). Figure 3 illustrates the behavior of the Leaky Bucket Accumulator. Each SEC input is monitored over a 128 ms period. If, within a 128 ms period, an irregularity occurs that is not deemed to be due to allowable jitter/wander, then the accumulator is incremented. The Accumulator will continue to increment up to the point that it reaches the programmed Bucket size. The “fill rate” of the Leaky Bucket is, therefore, 8 units/second. The “leak rate” of the Leaky Bucket is programmable to be in multiples of the fill rate (x 1, x 0.5, x 0.25 and x 0.125) to give a programmable leak rate from 8 units/sec down to 1 unit/sec. A conflict between trying to “leak” at the same time as a “fill” is avoided by preventing a leak when a fill event occurs. Figure 3 Inactivity and Irregularity Monitoring Inactivities/Irregularities Programmable Fall Slopes Reference Source Leaky Bucket Response Alarm bucket_size upper_threshold lower_threshold (all programmable) |
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