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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83261AVF датащи(PDF) 64 Page - National Semiconductor (TI) |
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DP83261AVF датащи(HTML) 64 Page - National Semiconductor (TI) |
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64 / 132 page  60 Control Information (Continued) Lost Frame Counter (LFCT) The Lost Frame Counter (LFCT) is specified in the FDDI MAC Standard It is the count of all instances where a Format Error is detected in a frame or token such that the credibility of the PDU reception is in doubt The Lost Frame Counter is incremented when any symbol other than a data or Idle symbol is received between the Starting and Ending Delimiters of a PDU (this includes parity errors) Interrupts are available on increment (CILRFRLST) and when the 20-bit counter overflows and wraps around (COLRFRLST) ACCESS RULES Address Read Write A8 – ABh Always Stop Mode D7 D6 D5 D4 D3 D2 D1 D0 LFCT0 Zero Zero Zero Zero Zero Zero Zero Zero LFCT1 Zero Zero Zero Zero CT(19) CT(18) CT(17) CT(16) LFCT2 CT(15) CT(14) CT(13) CT(12) CT(11) CT(10) CT(9) CT(8) LFCT3 CT(7) CT(6) CT(5) CT(4) CT(3) CT(2) CT(1) CT(0) In REV 1 of the BMAC device the Lost Count includes frames stripped on an ODD symbol boundary This may cause larger than expected counts in Rings where an upstream station produces valid remnants that begin on an ODD symbol boundary (The Ring Engine converts these remnants to byte aligned remnants so that only the downstream station would increment its Lost Count) In subsequent revisions remnants that begin on an odd symbol boundary are not considered lost frames and do not cause the Lost Count to increment 64 |
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