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DP83261AVF Datasheet(PDF) 66 Page - National Semiconductor (TI) |
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DP83261AVF Datasheet(HTML) 66 Page - National Semiconductor (TI) |
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66 / 132 page  60 Control Information (Continued) Frame Not Copied Counter (FNCT) The Frame Not Copied Counter (FNCT) maintains a count of the number of frames intended for this station that were not successfully copied by this station This count can be used to accumulate station performance statistics such as insufficient buffering or deficient frame processing capabilities for frames addressed to this station The Frame Not Copied Counter is incremented when an internal or external match (when OptionEMIND enabled) occurs on the Destination Address no errors were detected in the frame and the frame was not successfully copied (VCOPY signal not asserted) Not Copied MAC frames and Void frames are not included in this count Interrupts are available on increment (CILRFRNCOP) and when the 20-bit counter overflows and wraps around (COLRFRN- COP) ACCESS RULES Address Read Write B0 – B3h Always Stop Mode D7 D6 D5 D4 D3 D2 D1 D0 FNCT0 Zero Zero Zero Zero Zero Zero Zero Zero FNCT1 Zero Zero Zero Zero CT(19) CT(18) CT(17) CT(16) FNCT2 CT(15) CT(14) CT(13) CT(12) CT(11) CT(10) CT(9) CT(8) FNCT3 CT(7) CT(6) CT(5) CT(4) CT(3) CT(2) CT(1) CT(0) In REV 1 of the BMAC device the Frame Not Copied Counter does increment for all NSA frames received with the A indicator as an S symbol if it was copied or not This will result in higher than expected values in the Not Copied Counter To obtain a more accurate value with REV 1 of the BMAC device the number of copied NSA frames received with the A Indicator set should be subtracted from the value in the Not Copied Counter In subsequent revisions of the BMAC device NSA frames received with the A Indicator as S that are not copied will not be counted In REV 2 the handling of SMT NSA has been modified in accordance with the MAC-2 Draft Standard For SMT NSA frames the Frame Not Copied Count only increments for NSA frames received with the A Indicator as an R symbol for which the frame was not copied SMT NSA frames received with the A Indicator as an S do not cause this count to increment even if the frame is not successfully copied Group addressed frames transmitted by this station and recognized by this station that are not copied will also cause this counter to increment 66 |
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