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Software for White Rabbit PTP Core
Commit 97c2f4b9 authored by Grzegorz Daniluk's avatar Grzegorz Daniluk
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doc: improve description of packet class for the fabric interface

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doc/HDLdoc/fabric.tex
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......@@ -43,10 +43,20 @@ various information about Ethernet frame's structure and type:
it will be assigned from WRPC configuration)
\item[] \emph{vCRC} - the frame contains a valid CRC checksum
\item[] \emph{packet class} - the packet class assigned by the classifier
inside WRPC MAC module
inside WRPC MAC module.
\end{itemize}
OOB data is used for passing the timestamp-related information for the incoming and
The packet class assigned by the classifier is one-hot encoded with 8 possible
values: \textit{0x01} for class 0 to \textit{0x80} for class 7. In its default
configuration WRPC assigns {\bf class 0} (\textit{0x01}) to all frames that shall be
processed inside the core (those are never exposed to the user through the
fabric interface); {\bf class 7} (\textit{0x80} to all Etherbone frames that are
either broadcast or unicast with matching destination MAC address; {\bf class 6}
(\textit{0x40}) to all other traffic not qualified to any of the previous
classes.\\
{\bf OOB data} is used for passing the timestamp-related information for the incoming and
outgoing Ethernet frames. Each frame received from a physical link is
timestamped inside the WRPC and this value is passed as Rx OOB
data. On the other hand, for each transmitted frame the Tx timestamp can be read
......
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