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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM5347 датащи(PDF) 71 Page - PMC-Sierra, Inc |
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PM5347 датащи(HTML) 71 Page - PMC-Sierra, Inc |
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71 / 302 page  PM5347 S/UNI-PLUS DATA SHEET PMC-941033 ISSUE 6 SATURN USER NETWORK INTERFACE PLUS PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 55 SYNC state as described above. When both filtering and HCS checking are enabled, cells are dropped if uncorrectable HCS errors are detected, or if the corrected header contents match the pattern contained in the RACP Match Header Pattern and RACP Match Header Mask registers. Idle or unassigned cell filtering is accomplished by writing the appropriate cell header pattern into the RACP Match Header Pattern and RACP Match Header Mask registers. Idle/Unassigned cells are assumed to contain the all zeros pattern in the VCI and VPI fields. The RACP Match Header Pattern and RACP Match Header Mask registers allow filtering control over the contents of the GFC, PTI, and CLP fields of the header. The HCS is a CRC-8 calculation over the first 4 octets of the ATM cell header. The RACP block verifies the received HCS using the polynomial, x8 + x2 + x + 1. The coset polynomial, x6 + x4 + x2 + 1, is added (modulo 2) to the received HCS octet before comparison with the calculated result. While the cell delineation state machine (described above) is in the SYNC state, the HCS verification circuit implements the state machine shown in Figure 6. |
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