Re: Ethernet daisy chaining

Thanks for the input. Not sure that would apply to full duplex and 100 BT.

Looking at it further I think I've misread the wiki article - I think what
they are referring to is a inline repeater used to double the segment length
of a connection:

PC ---------------------- max length cable -------------------- [MII PHY -
MII PHY] --------------------- max length
cable ----------------------------- PC

This isn't what I need. What I want is my device to provide a repeater port
for a local PC so it doesn't need its own LAN connection:

LAN ------------------------------------ my
device ------------------------------ PC (PC sees the LAN through my device
port)

I think I'll need to goto an Ethernet switch like the Micrel KS8993 unless
someone has another idea how to do it discretely.

--
Allan Williams



"Brendan Gillatt" <brendan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:cslm53l8kca7mcta2fa6scbm2cblp7mql4@xxxxxxxxxx
On Mon, 28 May 2007 21:27:36 GMT, "Al Williams"
<donotreplydirect@xxxxxxxxxxxxxxxx> wrote:

I read this in Wikipedia near the end of the RMII docs:
http://en.wikipedia.org/wiki/RMII

"Since the RMII standard neglected to stipulate that TX_EN should only be
sampled on alternate clock cycles, it is not symmetric with CRS_DV and two
RMII PHY devices cannot be connected back to back to form a repeater; this
is possible, however, with the National DP83848 which supplies the decoded
RX_DV as a supplemental signal in RMII mode [3]."

It seems to imply you can create a simple repeater with two PHY's "back to
back" in MII mode. This would be useful for a new device we are working
on
that needs to daisy chain its Ethernet in and out. I can't find much info
on how to do this, anyone done this and if so, how?

Thanks.

AFAIK it should be possible - from what I can tell that is what dumb
ethernet hubs do anyway.
See http://www.zen22142.zen.co.uk/Circuits/Interface/pethhub.htm for a
simple 3 port ethernet hub schematic.
--
Brendan Gillatt
www.brendangillatt.co.uk
GPG: 0x6E265E61


.

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