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DP83266 데이터시트(PDF) 22 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP83266
상세설명  MACSITM Device (FDDI Media Access Controller and System Interface)
PDF  152 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83266 데이터시트(HTML) 22 Page - National Semiconductor (TI)

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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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