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etherstuff.txt
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1992-05-06
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$Id: etherstuff.txt,v 1.3 91/05/08 16:15:58 rsbx Exp $
Ethernet specific information for the SANA_II specification:
S2io_DataLength:
In the case of 802.3 packets, this field is filled with the
length field from the DTL.
Otherwise, it is the length of the packet data (same as
NetBuff.Count for non-raw reads).
Address format:
Ethernet addresses consist of 47 bits of address information and
a 1 bit multicast flag. The standard for expressing ethernet
addresses is as 6 bytes (octets) in the order in which the bytes
are transmitted with the low-order bits in a byte transmitted
first. The multicast flag bit is the least-significant bit of the
first byte.
Ethernet addresses in a Sana2IOReq occupy the first 6 bytes of
an address field in transmission order with the low-order bits in
a byte transmitted first.
Raw reads and writes:
The data format for a raw read or write is:
6 bytes of destination address,
6 bytes of source address,
2 bytes of type,
64 to 1500 bytes of data,
4 bytes CRC value covering all of the above.
See Ethernet specifications for more information.