Plan for 10/100 Ethernet support for umTRX
plddesigner at gmail.com
Fri Jul 27 19:20:39 UTC 2012
May be it's easy just modify Ettus code for support Tri-Mode Ethernet. I
think that it is not so difficult.
In that way we can chose Ethernet PHY work mode from host.
Also 'wait' feature (PAUSE frames / flow control) available not only for
Gigabit Ethernet. Some 10/100 Ethernet Controllers support it (for example,
2012/7/27 Robin Coxe <coxe at close-haul.com>
> Hi Sylvain.
> On Fri, Jul 27, 2012 at 9:04 AM, Sylvain Munaut <246tnt at gmail.com> wrote:
> > Hi,
> >> The Ettus UHD framework adopted for the umTRX only supports GigE
> >> (simple_gemac). A reworked, Wishbone-compliant 10/100 Ethernet MAC
> >> is included in the OpenRISC SoC project on Opencores. It has been
> >> ported to the Digilent Atlys board, which has a Spartan-6 FPGA.
> >> http://www.chokladfabriken.org/projects/orpsoc-atlys
> >> I'll begin the port of this Ethernet MAC (a cleaned-up version of the
> >> 10/100 core on OpenCores) to the UmTRX and test it on Close-Haul's
> >> SP-605 Spartan-6 eval. board. I'm not quite sure how long this task
> >> will take, but this feature falls into the
> >> "nice-to-have-but-not-urgent" category.
> > But would it be 10/100/1000 ? or just 10/100 ?
> Just 10/100. User would choose GigE or 10/100 via an IFDEF in the
> Verilog. I suppose it would also be possible to multiplex in the
> simple_gemac with this 10/100 core and set the mode from the ZPU via
> the Wishbone interface. There is a tri-mode Ethernet MAC that Ettus
> used to use on the USRP2, but I've never been able to make much sense
> of it. If you have suggestions for a better way to add 10/100
> support, I'm definitely interested in hearing them.
> > Also, doesn't UHD make use of the 'wait' feature of Gigabit (i.e.
> > PAUSE frames / flow control ) to avoid loosing data ? This doesn't
> > exist on 10/100 IIRC.
> I'm not all that familiar with UHD, so you probably know better than I
> do. Perhaps Thomas could comment?
> Robin Coxe | Close-Haul Communications, Inc. | Boston, MA
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