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DP83266 Datasheet(PDF) 22 Page - National Semiconductor (TI) |
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DP83266 Datasheet(HTML) 22 Page - National Semiconductor (TI) |
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22 / 152 page  50 Functional Description (Ring Engine) (Continued) If any frame of a service opportunity requests this option then all frames on that service opportunity will be stripped using this method Void Stripping is invoked upon the asser- tion of the STRIP signal at the beginning of a frame trans- mission Void Stripping is also automatically invoked by this station if it wins the Claim token process before the initial token is issued This removes all fragments and ownerless frames from the ring when the ring becomes operational FCS Transparency Normally the Ring Engine generates and transmits the FCS When the Frame Check Sequence Transparency op- tion is selected the Ring Engine device does not append the FCS to the end of the Information field This option is selected by asserting signal FCST The receiving stations treat the last four bytes of the data stream as the FCS This option may be useful for end to end FCS coverage when crossing FDDI bridges for diagnostic purposes or in Implementer frames 54 FRAME VALIDITY PROCESSING A valid frame is a frame that meets the minimum length criteria and contains an integral number of data symbol pairs between the Starting and Ending Delimiters as shown in Table 5-4 22 |
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