Lpc2000

--- In lpc2000@yahoogroups.com, "Anton Erasmus" <antone@s...> wrote:
> On 1 Feb 2005 at 22:52, Rick Collins wrote:
> > Unless you really need some speed.  You said it interfaces by I2C
> > which is very slow by comparison, ~400 kbps vs. >10 Mbps.  
> 
> That is if you use the I2C bus - I would only use this on a legacy
product 
> that does not have enough pins for the parallel mode. The normal method
> is to map it to a 8-bit 16K SRAM block. When one wants to send a packet,
> one copies the data to the specific socket Tx buffer, and set a bit
to transmit
> the data. The hardware will handle any TCP/IP overhead. 
> Normal frequency for bus timing is 25MHz, but a clock up to 50MHz can be
> used. the device can easily do the full 100Mbps using the normal
> parallel mode.

The wiznet web site disagrees with you.  I thought I would check it
out and it does seem like a nice product, but it is not fast.  Here is
their speed claims. 

High Performance
Processor       Performance (100Mbps, PIII 500MHz,1 channel, FDX)
Atmel 89C51            300 Kbps
Atmel AVR              3 Mbps
Intel 80386            6 Mbps
Hitachi SH7709A        8 Mbps
Hyperstone
E1-16KT+DMAC control   15Mbps

I don't know what a Hyperstone... is, but that is the fastest
throughput they claim, 15 Mbps, using DMA.  Still that is not a bad
speed.  


> > I don't plan to sell the board in versions, that gets to be a PITA.
> > But I will likely sell a bare board version if you want to
> > do-it-yourself.  
> 
> I seldom buy these sort of products, hence I am obviously not the
> target market, hence not in a position to say whether this is a good
> or bad idea.

If cost is of ultimate importance, I expect Olimex will have
satifactory boards.