Hi
I am working with Altera Nios Kit with LAN91C111!
Regards
"Marc" <damc4@gmx.de> wrote in message
news:cf0ec8fc.0312280334.409afc93@posting.google.com...
> Hi John,
>
> the LAN91C111 has an external MII interface and it seems to be
> possible to disable the internal PHY (and use this MII for an external
> PHY). If it works also the other way round I have no idea, never tried
> it.
>
> I used the folowing PHYs MAC: Broatogether with the OpenCores dcom
> BCM5201, AMD AM79C874 NetPHY, National Semi DP83865.
>
> What kind of hardware do you use?
>
> Regards,
> Marc
>
> e-mail: Marc dot Colling at MaCo-Engineering dot de
>
>
>
> "John" <305liuzg@163.net> wrote in message
news:<bsm116$n39$1@mail.cn99.com>...
> > Hi,
> > "Marc" <damc4@gmx.de> wrote in message
> > news:cf0ec8fc.0312210240.54c85860@posting.google.com...
> > > Didn't you mean this OpenCores project?
> > >
> > > http://www.opencores.org/projects/ethmac/
> > >
> > > It is an Ethernet MAC using the MII interface to connect to every PHY
you
> > want!
> > > I used the core in Altera FPGAs and have had no problems with it.
> >
> > Which PHY did you use?
> > I have LAN91C111 but don't know whether it can be used only as the PHY!?
> >
> > Regards
> >
> > >
> > > Regards,
> > > Marc
> > >
> > > e-mail: Marc dot Colling at MaCo-Engineering dot de
> > >
> > >
> > > "John Retta" <jretta@rtc-inc.com> wrote in message
> > news:<N2QDb.7879$0s2.2125@newsread2.news.pas.earthlink.net>...
> > > > That is correct. No Phy. My mistake in original email.
> > > >
> > > > --
> > > > Regards,
> > > > John Retta
> > > >
> > > > email : jretta@rtc-inc.com
> > > > web : www.rtc-inc.com
> > > >
> > > >
> > > > "Mike Treseler" <mike.treseler@flukenetworks.com> wrote in message
> > > > news:3FDF7EEB.7060509@flukenetworks.com...
> > > > > John Retta wrote:
> > > > > > You can remove the cost variable from the equation.
> > > > > > Check www.opencores.org. They offer open source code
> > > > > > for numerous cores, including a MAC PHY
> > > > >
> > > > > I found the MAC, but the only PHY listed is for USB.
> > > > >
> > > > >
> > > > > -- Mike Treseler
> > > > >
Reply by Marc●December 28, 20032003-12-28
Hi John,
the LAN91C111 has an external MII interface and it seems to be
possible to disable the internal PHY (and use this MII for an external
PHY). If it works also the other way round I have no idea, never tried
it.
I used the folowing PHYs together with the OpenCores MAC: Broadcom
BCM5201, AMD AM79C874 NetPHY, National Semi DP83865.
What kind of hardware do you use?
Regards,
Marc
e-mail: Marc dot Colling at MaCo-Engineering dot de
"John" <305liuzg@163.net> wrote in message news:<bsm116$n39$1@mail.cn99.com>...
> Hi,
> "Marc" <damc4@gmx.de> wrote in message
> news:cf0ec8fc.0312210240.54c85860@posting.google.com...
> > Didn't you mean this OpenCores project?
> >
> > http://www.opencores.org/projects/ethmac/
> >
> > It is an Ethernet MAC using the MII interface to connect to every PHY you
> want!
> > I used the core in Altera FPGAs and have had no problems with it.
>
> Which PHY did you use?
> I have LAN91C111 but don't know whether it can be used only as the PHY!?
>
> Regards
>
> >
> > Regards,
> > Marc
> >
> > e-mail: Marc dot Colling at MaCo-Engineering dot de
> >
> >
> > "John Retta" <jretta@rtc-inc.com> wrote in message
> news:<N2QDb.7879$0s2.2125@newsread2.news.pas.earthlink.net>...
> > > That is correct. No Phy. My mistake in original email.
> > >
> > > --
> > > Regards,
> > > John Retta
> > >
> > > email : jretta@rtc-inc.com
> > > web : www.rtc-inc.com
> > >
> > >
> > > "Mike Treseler" <mike.treseler@flukenetworks.com> wrote in message
> > > news:3FDF7EEB.7060509@flukenetworks.com...
> > > > John Retta wrote:
> > > > > You can remove the cost variable from the equation.
> > > > > Check www.opencores.org. They offer open source code
> > > > > for numerous cores, including a MAC PHY
> > > >
> > > > I found the MAC, but the only PHY listed is for USB.
> > > >
> > > >
> > > > -- Mike Treseler
> > > >
Reply by John●December 28, 20032003-12-28
Hi,
"Marc" <damc4@gmx.de> wrote in message
news:cf0ec8fc.0312210240.54c85860@posting.google.com...
> Didn't you mean this OpenCores project?
>
> http://www.opencores.org/projects/ethmac/
>
> It is an Ethernet MAC using the MII interface to connect to every PHY you
want!
> I used the core in Altera FPGAs and have had no problems with it.
Which PHY did you use?
I have LAN91C111 but don't know whether it can be used only as the PHY!?
Regards
>
> Regards,
> Marc
>
> e-mail: Marc dot Colling at MaCo-Engineering dot de
>
>
> "John Retta" <jretta@rtc-inc.com> wrote in message
> > That is correct. No Phy. My mistake in original email.
> >
> > --
> > Regards,
> > John Retta
> >
> > email : jretta@rtc-inc.com
> > web : www.rtc-inc.com
> >
> >
> > "Mike Treseler" <mike.treseler@flukenetworks.com> wrote in message
> > news:3FDF7EEB.7060509@flukenetworks.com...
> > > John Retta wrote:
> > > > You can remove the cost variable from the equation.
> > > > Check www.opencores.org. They offer open source code
> > > > for numerous cores, including a MAC PHY
> > >
> > > I found the MAC, but the only PHY listed is for USB.
> > >
> > >
> > > -- Mike Treseler
> > >
Reply by Marc●December 21, 20032003-12-21
Didn't you mean this OpenCores project?
http://www.opencores.org/projects/ethmac/
It is an Ethernet MAC using the MII interface to connect to every PHY you want!
I used the core in Altera FPGAs and have had no problems with it.
Regards,
Marc
e-mail: Marc dot Colling at MaCo-Engineering dot de
"John Retta" <jretta@rtc-inc.com> wrote in message news:<N2QDb.7879$0s2.2125@newsread2.news.pas.earthlink.net>...
> That is correct. No Phy. My mistake in original email.
>
> --
> Regards,
> John Retta
>
> email : jretta@rtc-inc.com
> web : www.rtc-inc.com
>
>
> "Mike Treseler" <mike.treseler@flukenetworks.com> wrote in message
> news:3FDF7EEB.7060509@flukenetworks.com...
> > John Retta wrote:
> > > You can remove the cost variable from the equation.
> > > Check www.opencores.org. They offer open source code
> > > for numerous cores, including a MAC PHY
> >
> > I found the MAC, but the only PHY listed is for USB.
> >
> >
> > -- Mike Treseler
> >
Reply by glen herrmannsfeldt●December 20, 20032003-12-20
Jan Panteltje wrote:
(snip)
> I have also build that little differential amp from fpga-fun site.
> Not all working yet (no time).
> I have not looked up the 100BASE-T spec yet, but 3 voltage levels can
> be done using 2 banks with 2 different references?
> For a 100MHz transformer, remember those 300Ohm to 75 coax VHF
> transformers?
> Every old TV had one, just a ferrite core with 3 or 4 turns...
> But my ethernet card was only 5.80 Euro, (6 $), there is a small
> transformer on it.
> So for 6 $ you have a transformer.
> Dunno how they can make these cards for that price.
There should be a DIP package near the RJ45 jack, which is
three little ferrite transformers in one package. About like
the TV ones, only even smaller.
-- glen
Reply by John Retta●December 16, 20032003-12-16
That is correct. No Phy. My mistake in original email.
--
Regards,
John Retta
email : jretta@rtc-inc.com
web : www.rtc-inc.com
"Mike Treseler" <mike.treseler@flukenetworks.com> wrote in message
news:3FDF7EEB.7060509@flukenetworks.com...
> John Retta wrote:
> > You can remove the cost variable from the equation.
> > Check www.opencores.org. They offer open source code
> > for numerous cores, including a MAC PHY
>
> I found the MAC, but the only PHY listed is for USB.
>
>
> -- Mike Treseler
>
Reply by Mike Treseler●December 16, 20032003-12-16
John Retta wrote:
> You can remove the cost variable from the equation.
> Check www.opencores.org. They offer open source code
> for numerous cores, including a MAC PHY
I found the MAC, but the only PHY listed is for USB.
-- Mike Treseler
Reply by John Retta●December 16, 20032003-12-16
You can remove the cost variable from the equation.
Check www.opencores.org. They offer open source code
for numerous cores, including a MAC PHY with associated
test bench, and documentation. According to the "Status Log"
for this core, it has been already tested in HW, and has
been used in several commercial implementations.
The reasons for implementing functions in FPGA vs discrete
IC implementation, are all very generic :
[1] Probable reduction in IC count, probable associated cost reduction,
and probable increase in reliability.
[2] Eliminate future redesigns of PWB when an external part
experiences end-of-life.
[3] Ability to "contain" majority of digital logic within single
device simplifies clock domain management for synchronous
design - ie. moves from a PWB/chip-to-chip problem to
a single chip problem .. where it is much easier to manage.
--
Regards,
John Retta
Owner and Designer
Retta Technical Consulting Inc.
email : jretta@rtc-inc.com
web : www.rtc-inc.com
"Martin" <ma_d@freenet.de> wrote in message
news:8c88ba05.0312121258.7e68dc7c@posting.google.com...
> Hi all!
>
> Can someone tell me the advantages and disadvantages of an ethernet
> MAC core implemented in a FPGA for a System On Chip?
>
> Why to buy a lincese for several thousand dollar for an ethernet MAC
> core and there is also an external PHY chip on the board?
> There are also external chips which combine the MAC and the PHY layer.
>
> Thanks
>
> Martin
Reply by Jan Panteltje●December 14, 20032003-12-14
On a sunny day (Sun, 14 Dec 2003 07:48:34 GMT) it happened "Jean Nicolle"
<j.nicolle@sbcglobal.net> wrote in
<mBUCb.71275$Q%5.12131@newssvr25.news.prodigy.com>:
>No, I didn't use any PLL so far.
>For receiving, I oversampled the signal (possible since 10BASE-T is so slow)
>and for transmitting I used a 20MHz clock.
>100BASE-T would surely have been more difficult, first the signal looks like
>125MHz, and now you mention this 3 voltage signals...
>
>I didn't use any transformer, used capacitive coupling for the receiver, and
>direct coupling for the transmitter... works in the lab!
>A transformer might be necessary in real life for security or reliability
>reasons?
>Jean
I have also build that little differential amp from fpga-fun site.
Not all working yet (no time).
I have not looked up the 100BASE-T spec yet, but 3 voltage levels can
be done using 2 banks with 2 different references?
For a 100MHz transformer, remember those 300Ohm to 75 coax VHF
transformers?
Every old TV had one, just a ferrite core with 3 or 4 turns...
But my ethernet card was only 5.80 Euro, (6 $), there is a small
transformer on it.
So for 6 $ you have a transformer.
Dunno how they can make these cards for that price.
J
Reply by Jean Nicolle●December 14, 20032003-12-14
No, I didn't use any PLL so far.
For receiving, I oversampled the signal (possible since 10BASE-T is so slow)
and for transmitting I used a 20MHz clock.
100BASE-T would surely have been more difficult, first the signal looks like
125MHz, and now you mention this 3 voltage signals...
I didn't use any transformer, used capacitive coupling for the receiver, and
direct coupling for the transmitter... works in the lab!
A transformer might be necessary in real life for security or reliability
reasons?
Jean
"glen herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message
news:RyTCb.387078$ao4.1285856@attbi_s51...
> (snip question about ethernet in FPGA)
>
> Jean Nicolle wrote:
>
> > Actually, if you accept a few restrictions, you can do it all in the
FPGA
> > with very little outside electronics.
> > I've got good success with 10BASE-T
> > http://www.fpga4fun.com/10BASE-T.html
>
> Do you need a PLL to do it? I thought it would, but maybe not.
>
> For 100baseTX you need three voltage levels. Maybe two outputs and
> appropriate resistors would work. Detecting three voltages on input
> will be hard, though.
>
> You still need the transformer, which usually doesn't come in
> an FPGA.
>
> -- glen
>