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PM7346 Datasheet(PDF) 84 Page - PMC-Sierra, Inc |
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PM7346 Datasheet(HTML) 84 Page - PMC-Sierra, Inc |
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84 / 419 page  PM7346 S/UNI-QJET DATASHEET PMC-960835 ISSUE 6 SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3 PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 63 Figure 8 - Framing algorithm (CRC_REFR = 0) Mark multifram e alignm ent C onfirm Fram ing Pattern in nex t m ultifra m e S lip 1 bit Fra m ing Patte rn M a tc he d Reset or O ut o f Fram e Else Fa il C onfirm F ram ing Pattern in next m ultifra m e Fa il Pass Declare in-fram e Pass Using this algorithm, the J2-FRMR will on average find frame in 5.07ms when starting the search in the worst possible position, given a 10-4 error rate and no static mimic patterns. When the CRC_REFR bit is set to logic 1, in addition to requiring three consecutive correct framing patterns, the J2-FRMR requires that the first two CRC-5 checks be correct, or a reframe is initiated. To speed the process, the CRC-5 and frame alignment checks are run concurrently, as illustrated in Figure 9. |
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