Lpc2000

On 26 Jan 2005 at 18:08, Rick Collins wrote:

> 
> 
> --- In lpc2000@yahoogroups.com, "dsidlauskas1" <dsidlauskas@w...>
> wrote: > > I have a project where the LPC312x fits very well accept
> that there's > a requirement for ehternet connectivity. I'd appreciate
> any > suggestions as to how this might be accomplished cheaply and
> simply.
> 
> I am looking at doing something very similar with the AT91SAM7S chips.
>  Like the LPC312x parts, there is no external data bus.  I think this
> is the biggest issue.  It means you will either need to add a serial
> to parallel interface chip of some sort (possibly an FPGA) or you will
> have to bit bang the bit IO ports to talk to the Ethernet chip.  
> 
> The more I think about this, the more I like using an FPGA to provide
> a fast serial port to the ARM chip and a parallel port to a LAN91C111
> chip.  I am discussing this in the AT91SAM7 group.  I expect most of
> this discussion will be applicable to the LPC21xx chips too.   
> 
> http://groups.yahoo.com/group/AT91SAM7/
> 


If you really need ethernet on a chip without external bus-interface, then
using the Wiznet W3100A, makes much more sense. It alread has an
I2C interface and runs the TCP/IP stack in hardware for upto 4 simultaneous
connections. If you want to connect it using the parallel bus, it has a mode
where it needs only 2 address lines, 8 data lines, Read, Write, interrrupt and
Chip Select. A total of 14 pins. If you want more than 4 simultanoues connections,
then you have to have a complete TCP/IP stack as with other ethernet controllers.


Regards
  Anton Erasmus

 

-- 
A J Erasmus