50+ pages fresh from Antti's brain

On Nov 3, 9:34=A0am, -jg <jim.granvi...@gmail.com> wrote:
> On Nov 3, 12:12=A0am, Frank Buss <f...@frank-buss.de> wrote:
>
>
>
> > BTW: the W7100 microcontroller sounds interesting: 64 kB flash, 64 kB S=
RAM,
> > 32 IO ports and TCP/IP for $6.40 (http://tinyurl.com/yev4vzy).
>
> Reminds me of the DS80C4xx from Dallas, which also has 64K RAM, only
> that has ROM, (and no Phy) - price of $8/1K on the Dallas part, and
> it's not clear what the volume price of the W7100 is.
> (ie that $6.40 looks like a promo price ..? )
>
> No ADCs and no SPI port - so the Ethernet pumps nicely into this
> device, but where does it go from there ?
> [Could make a nice FPGA peripheral ? ;) ]
>
> Seems to need TWO crystals ?, and has interesting ROM/FLASH speed
> comparisons. ROM looks 4x faster, so they have simple
> maths libraries included in ROM
>
> How well does the W7100 debug tool chain work ?
>
> -jg

Jim, I do not know yet :(

as I wrote, I had W3100 samples, and never used them.. (they had
silicon errata too much..)
the 2 clock is sure major PITA, but it less hassle then external PHY

hm.. I also have samples of another 8051ETH mcu with PHY and 512KB
flash that cost below 6$
but there is no 49$ devkit for that one, maybe time for me to make
one:)

as of W7100 its all about the "easy", it makes sense to use it, if
there support and reference design
are just superior, if not then no reason to consider the wiznet iMCU
my 2 cents


Antti

Antti <antti.lukats@googlemail.com> wrote:

>On Nov 2, 8:36=A0pm, Frank Buss <f...@frank-buss.de> wrote:
>> Nico Coesel wrote:
>> > NXP's LPC1700 series (Cortex M3) is probably cheaper and has at least
>> > 5 times more performance.
>>
>> You are right, the chip is interesting. The smallest one of the LPC1700
>> family with network support costs about the same as the W7100, but has an
>> additional DAC, ADC and USB:
>>
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=3D0&keyword..=
>.
>>
>> --
>> Frank Buss, f...@frank-buss.dehttp://www.frank-buss.de,http://www.it4-sys=
>tems.de
>
>yes and no, I have the LPC1768 sample on my desk, yet i consider the
>W7100
>interesting too. LPC1768 has no ethernet PHY and W7100 has lots of
>ethernet
>"in hardware" so for tasks where you need ETH+something and do not
>need
>the extras the W7100 maybe better

But what if you want something special? I bet the hardware tcp/ip
stack is very limited. I have been using the LPC2000 series (even the
ones without MAC) within IP networks for several years now and
sometimes you really need some extra flexibility.

Also beware of internal PHYs. The process for a good phy is different
than for a good microcontroller. You'll probably end up with a power
guzzling controller. Last year I evaluated a Freescale controller with
internal phy. It consumed about 1W and required a 4 layer board for
adequate heat sinking.

-- 
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
                     "If it doesn't fit, use a bigger hammer!"
--------------------------------------------------------------

nico@puntnl.niks (Nico Coesel) writes:

> guzzling controller. Last year I evaluated a Freescale controller with
> internal phy. It consumed about 1W and required a 4 layer board for
> adequate heat sinking.

Was that the M52235? I have a couple eval boards that does not seem to
get hot at all. They can also run PoE.

Petter
-- 
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
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Petter Gustad <newsmailcomp6@gustad.com> wrote:

>nico@puntnl.niks (Nico Coesel) writes:
>
>> guzzling controller. Last year I evaluated a Freescale controller with
>> internal phy. It consumed about 1W and required a 4 layer board for
>> adequate heat sinking.
>
>Was that the M52235? I have a couple eval boards that does not seem to
>get hot at all. They can also run PoE.

I think so. Perhaps it will consume a lot of power if a long ethernet
cable is connected. The datasheet / application note recommends a 4
layer board for cooling.

-- 
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
                     "If it doesn't fit, use a bigger hammer!"
--------------------------------------------------------------