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'[EE]:Novell Ether (Hack)?'
2000\12\04@041005 by Terry

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Hi, has anybody tot of getting a PIC (or other MCU) interfaced to the PHY's
MII? Any advise of links to the MII interface? AMD's got some info on the
RMII but i'd like to take a peek at the full blown MII. TIA.

Terry

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2000\12\04@041427 by Alok Dubey

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u want to interface a PIC to a NIC. .the only cards u get are ISA /PCI
cards. so u ned to intrface them to ur PIC.. i ran that query sometime
back.. and thats what i got.
there doesnt seem to be asimple way of building up a stack on a simple
txcvr.. i wonder where these Router companies pick up their stuff?
alok



> {Original Message removed}

2000\12\04@074315 by Bob Ammerman

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----- Original Message -----
From: Alok Dubey <spam_OUTadubeyTakeThisOuTspamWIPRO.CO.IN>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Monday, December 04, 2000 4:24 AM
Subject: Re: [EE]:Novell Ether (Hack)?


> u want to interface a PIC to a NIC. .the only cards u get are ISA /PCI
> cards. so u ned to intrface them to ur PIC.. i ran that query sometime
> back.. and thats what i got.
> there doesnt seem to be asimple way of building up a stack on a simple
> txcvr.. i wonder where these Router companies pick up their stuff?
> alok

The either spend a lot of money writing a stack, or they spend a lot of
money buying a stack.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2000\12\04@113216 by Terry

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Ah no... Actually what i had in mind was replacing the MAC with a
microcontroller so it'll be the MCU controlling the PHY. Since a dedicated
PHY will have the signal conversion required to drive and receive from the
isolation transformer, it'll be neater, smaller and think of all the Cat 5
wiring already in the walls. It doesn't have to be a full blown stack,
something less advanced that will still allow a PC to toggle a relay or
even read a value from.

Of course it could be done with RS485 or LVDS but getting it on the
Ethernet would give it more potential me thinks.

Terry


At 02:54 PM 12/4/00 +0530, you wrote:
>u want to interface a PIC to a NIC. .the only cards u get are ISA /PCI
>cards. so u ned to intrface them to ur PIC.. i ran that query sometime
>back.. and thats what i got.
>there doesnt seem to be asimple way of building up a stack on a simple
>txcvr.. i wonder where these Router companies pick up their stuff?
>alok
>
>
>
>> {Original Message removed}

2000\12\04@114419 by Bill Westfield

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>>    i wonder where these Router companies pick up their stuff?

Almost all of the current generation of ethernet controllers is "system
oriented" - most modern chipsets connect directly to a PCI bus.  The
previous generation (AMD LANCE, Intel 82586) were DMA based (with rather
wimpy DMA controllers onchip.)  As far as I know, the only byte-IO-oriented
ethernet controllers were the (very old) Seeq 8002/8003 chips - a rather
large number of these got used in cisco routers, connected to a bitslice
microengine or two to do "fancier, smarter, DMA, when needed."

I imagine the switch people do something in an ASIC, and these days chip
vendors do include hooks in the controllers to allow router and switch like
functionality (ie "side" ports that allow external logic to decide whether
to finish reception of a packet.)

Ethernet isn't that HARD, after all.  The oldest cisco gear used the
original 3com multibus ethernet cards, which were all SSI/MSI TTL and
some PALs (not that densly packed, either.)  I'd be surprised if there
isn't an "open hardware" FPGA ethernet controller out there somewhere.

(I haven't worked with ethernet controllers directly in many years, so
the above may be a bit inaccurate.  I don't recognize "MII" or "RMII",
for instance.)

BillW

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2000\12\05@003912 by Alok Dubey

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no i mean the h/ware..
where do they get their h/ware


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