[En-Nut-Discussion] ENJ28J60

[Bengt Florin]

Correct, AVR is capable of 8MHz SPI.
The LPC family is not.

As a matter of fact I first wanted to connect ENC28J60 to a LPC2106.
This seemed like a perfect couple, small and powerful.
However the LPC divides clock by 8 for fastest SPI clock, yielding only
7.5MHz.
Whether that is close enough to 8 Microchip support couldn't tell.

To be honest the errata says the SPI clock could be lower if it is
synchronous to 28J60 chip clock, but I'm not sure it will be synchronous
enough as LPC has a PLL driven clock. And then you have to run the LPC on
25MHz crystal.

Otherwise the LPC family is one of my favorite ARM7 right now. It runs ARM
code at full speed directly from FLASH. That means you don't have to bother
to put your time critical interrupt code in SRAM and you may compile all
your code in ARM mode without any performance penalty like for the SAM7
family.

Can't really understand why Atmel didn't implement some MAM-like feature.
But maybe I'm the only person on the planet still not compiling Thumb code.

Wasting half the CPU bandwidth for nothing is not my game.

So what we look for is when LPC comes with integrated Ethernet 6 PHY.
Or else we go for the Coldfire solution, but that's another thread.

/bengt

-----Original Message-----
From: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of Richard Sloan
Sent: den 24 maj 2006 15:54
To: Ethernut User Chat (English)
Subject: RE: [En-Nut-Discussion] ENJ28J60

Yes this 8Mhz is not good, so you would need 16Mhz XTAL on AVR and SPI
doubler on.... and just get 8Mhz....
 
Another interesting part is LPC2124 16/32 bit ARM7TDMI-ST with 256K Bytes
Program Flash, 16K Bytes RAM, RTC,4x 10 bit ADC 2.44 uS, 2x UARTs, I2C, 2x
SPI, 2x 32bit TIMERS, 7x CCR, 6x PWM, WDT, 5V tolerant I/O, up to 60MHz
operation 
 
Nice 2 UART, 2 SPI and 60Mhz!
 
www.olimex.com has inexpensive boards for it with ethernet, and its fast!
 
Also parts are available at Digikey for it also.



> From: bengt at florin.se> To: en-nut-discussion at egnite.de> Subject: RE:
[En-Nut-Discussion] ENJ28J60> Date: Tue, 23 May 2006 10:27:00 +0200> > Also
the current status of the ENC28J60 (Rev B4) silicon makes it> practically
unusable for most CPU's, as the SPI interface doesn't work> properly for
clock rates under 8MHz.> > Silicon Rev B5 is said to correct this, but
Microchip has yet not announced> when this will be available.> > Also, I
agree to Haralds comment. Power consumption is way too high.> > Another
interesting CPU to port Nut to would be the Freescale Coldfire> MCF52235, a
true single chip solution as it also contains an Ethernet PHY.> > I remember
reading some comments from Erik Lins to port Nut to Coldfire> MCF5282.> Well
yes, it was back in 2004. Time flies.> > Any interest of, or progress in the
Coldfire direction?> > /bengt> > -----Original Message-----> From:
en-nut-discussion-bounces at egnite.de>
[mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of Harald Kipp> Sent:
den 22 maj 2006 09:39> To: Ethernut User Chat (English)> Subject: Re:
[En-Nut-Discussion] ENJ28J60> > Hello Richard,> > At 17:43 21.05.2006 -0400,
you wrote:> >MIcrochip ENC28J60 Has anyone been able to use this IC with
Ethernut? Been > >considering making a Ethernut board and using this, but I
am terrible at > >writing drivers... I see code to operate the IC in the
AVRlib,> > After Erik Lins pointed me to the electrical characteristics,>
namely the operating current, I lost my interest in this chip.> > >also any
drivers for the newer MP3 IC's from VLSI 1002 or 1003?> >> > Due to missing
hardware (Medianut still uses the old VS1001K),> we never worked on an
update. I agree that this is very sad.> > Harald> >
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