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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MT9072AB датащи(PDF) 87 Page - Zarlink Semiconductor Inc |
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MT9072AB датащи(HTML) 87 Page - Zarlink Semiconductor Inc |
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87 / 275 page  MT9072 Data Sheet 87 Zarlink Semiconductor Inc. 13.0 Performance Monitoring 13.1 T1 Error Counters The MT9072 has nine error counters for each framer, which can be used for maintenance testing and ongoing measurement of the quality of a DS1 link and to assist the designer in meeting specifications such as TR62411 and T1.403. All counters can be preset or cleared by writing to the appropriate counter registers. Associated with each counter is a maskable event occurrence interrupt and a maskable counter overflow interrupt. Overflow interrupts are useful when cumulative error counts are being recorded. For example, every time the framing bit error counter overflow interrupt (FEO) occurs, 65536 frame errors have been received since the last FEO interrupt. Also if a counter overflows, the overflow indicators are latched in the Overflow reporting latch register(Y24). All counters are cleared by a counter clear bit -CNTCLR - low to high transition (bit 2 of the IO Control Word, YF1). An alternative approach to event reporting is to mask error events and to enable the 1 second sample bit (SAMPLE - bit 1 of the Interrupt and IO Control Word). When this bit is set the latched version of the counters(Y28 to Y2C) for change of frame alignment, loss of frame alignment, bpv errors, crc errors, errored framing bits, and multiframes out of sync are updated on one second intervals coincident with the maskable one second interrupt timer. . Counter Interrupt Status Bits 1 Second Latch Description Bits Address Indication Overflow Description Bit Address PRBS Error Counter and CRC Multiframe counter for PRBS PS7-0, PSM7-0 Y15 PRBSI PRBSOI PRBSMFOI NA NA NA Multiframe Out of Frame Counter MFOOF 7-0 Y16 MFOOFI MFOOFOI Multiframe Out of Frame Count Latch MFOO FL15-0 Y2C Framing Bit Error Counter FC15-0 Y17 FBEI FEOI Framing Bit Error Counter Latch FCL15- 0 Y28 BPV Counter BPV15-0 Y18 BPVI BPVOI Bipolar Violation Count Latch BPVL 15-0 Y29 CRC-6 Error counter CC15-0 Y19 CRCI CRCOI CRC-6 Error Count Latch CRCL 15-0 Y2A Out of frame counter, change of frame alignment counter OOF7-0, COFA7-0 Y1A OOFOI COFAI OOFOI COFOIL Out of Frame, Change of Frame Alignment Count Latch OOFL 7-0 COFAL 7-0 Y2B Excessive Zero counter EXZ7-0, Y1B EXZI EXZOL NA NA NA Table 41 - Error Counters Summary (T1) |
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