RE: [ethmac] Re: Block diagram

["NewsGroup" <nbase@nbase.com>]

19-Sep-00

   Maik Hi,

		The Vlan it contain 2 filed I forgot the exact name of each but they are
both 16 bit.

the first one is always 8100
the second one is
3 bit priority
1 bit tr encapsulation which will be for ethernet packet always 0
and than
12 bit of vlan number.

in respect to flow control, well I forgot the "number" which define that the
packet is flow control which try to find it later or maybe someone have the
spec and can check this number but after that come the flow control timer
which you need to load and this number is multiply of slot-time that during
this time your station need to stop trasmition.

The way almost everyone use this is send the number 0 to start the
trasmition and number f..f to stop the trasmition as it is quite comlicated
to calculate the exact time you need the other side to stop trasmission, so
simple send the above and work in sort of Xon/Xoff way.

have a nice day

   Illan



-----Original Message-----
From: owner-ethmac@opencores.org [mailto:owner-ethmac@opencores.org]On
Behalf Of Maik Boden
Sent: Monday, September 18, 2000 1:24 PM
To: ethmac@opencores.org
Subject: [ethmac] Re: Block diagram


Hi there,

now I'm back from vacation and my page is up to date:

  http://www.inf.tu-dresden.de/~mb25/ethmac

I found interesting websites and useful information in your links
collection.
Really great! But do you have further details about VLAN or FlowControl? I
only
know a little bit about these things.

BTW: Don't look at block definition strictly. I think some details in design
are
not good. For example the partition control. Maybee it's better to use an
extra
block for the management of collisions and carrier sense that is only active
in
half duplex mode. But I'm nut sure about it. If someone likes to check this
I
would be glad to get any reply.


Regards
Maik Boden