collision happening when crc is transmitted by the transmitter

If you are investigating collisions, the implication is that
you will be dealing with Gigabit half duplex.

If I recall correctly, people on this newsgroup have been saying
that there is no Gigabit half duplex equipment on the market.
After all, with the distance limitations, people are pretty much
going fully switched anyhow.

On Feb 13, 1:50 pm, rober...@hushmail.com (Walter Roberson) wrote:


I am sorry I didn't make it clear. The IP core design involves
10/100/1000 Mbps. So My question applies to even 10/100 Mbps case
also.

 krish.vedam@gmail.com wrote:



As other posters have noted, there is little application for half-duplex
Gigabit Ethernet. In the event you *do* want to support such functions,
recognize that there is "carrier extension" in GbE, and collisions must
be detected for the first 512 bytes, not just the first 64 as in 10/100.

That said, it is imperative that you detect collisions during the FCS
transmission. Such collisions are "valid" (in the sense that they do not
imply any faults in equipment or network configuration); a failure to
detect collision during FCS would also mean non-compliance with the
standard.



Then I strongly suggest that you redesign your state machine, or
purchase one of the available, known compliant MAC cores.



Yes. Again, you should read the standard carefully, particularly the MAC
behavioral formulation in Clause 4 (the Pascal code).


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Rich Seifert              Networks and Communications Consulting
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wrote:


Dear Rich,

Thanks a lot for your feedback. I will handle the situatuon in the
hardware accordingly.

Regards,
Krish.