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DP83266 Datasheet(PDF) 87 Page - National Semiconductor (TI) |
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DP83266 Datasheet(HTML) 87 Page - National Semiconductor (TI) |
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87 / 152 page  70 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 0A8–0ABh Always Stop Mode Register Bits D7 D6 D5 D4 D3 D2 D1 D0 LFCT0 Zero Zero Zero Zero Zero Zero Zero Zero LFCT1 Zero Zero Zero Zero CT19 CT18 CT17 CT16 LFCT2 CT15 CT14 CT13 CT12 CT11 CT10 CT9 CT8 LFCT3 CT7 CT6 CT5 CT4 CT3 CT2 CT1 CT0 Frame Copied Counter (FCCT) The Frame Copied Counter (FCCT) maintains the count of the number of frames addressed to this station and successfully copied This counter can be used to accumulate station performance statistics The Frame Copied Counter is incremented when a frame which contains no errors and is addressed to this station is successful- ly copied Copied MAC and Void frames are not included in this count When OptionEMIND is set this count also includes frames copied as a result of external matches as indicated by EA For SMT NSA frames the Frame Copied Count only increments for NSA frames received with the A Indicator as an R symbol for which the frame was copied SMT NSA frames received with the A Indicator as an S symbol do not cause this count to increment even if the frame is successfully copied Note that when in a promiscuous copy mode this count will not increment for every frame copied only for frames addressed to this station that are copied Interrupts are available on increment (CILRFRCOP) and when the 20-bit counter overflows and wraps around (COLRFRCOP) Access Rules Address Read Write 0AC–0AFh Always Stop Mode Register Bits D7 D6 D5 D4 D3 D2 D1 D0 FCCT0 Zero Zero Zero Zero Zero Zero Zero Zero FCCT1 Zero Zero Zero Zero CT19 CT18 CT17 CT16 FCCT2 CT15 CT14 CT13 CT12 CT11 CT10 CT9 CT8 FCCT3 CT7 CT6 CT5 CT4 CT3 CT2 CT1 CT0 87 |
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