In SX Microcontrollers, SX/B Compiler and SX-Key Tool, hpham wrote:

I've seen the SX used with the RTL8019AS chip before.  The SX came out a way before the ENC28J60 was even conceived so it's likely everyone stuck to the RTL8019AS since Scenix/Ubicom provided a reference design for that.  Of course it used ASM and was severely limited in it's ability to function on routed networks.

I was about to start on a ENC28J60 + SX project, but then the Propeller showed up and I went with that instead.  It wouldn't be hard to do UDP only, since it is a really simple protocol (you would only need ARP and UDP to get it to function).  TCP would be a tight fit since most designs today expect the microcontroller to fit the entire ip packet/frame in the microcontroller memory.  It may be possible, but it wouldn't be very fun since you would have to access the ENC28J60 SRAM constantly to read/write your packet data.

One last note:  It seems as though Ethernet only comes to microcontrollers that have a very good C toolchain available.  The SX doesn't seem to have a single widely accepted C compiler.  I decided to take the plunge with the Propeller and make my own stack in SPIN from the ground up.  It takes a lot of time to write and debug one from the ground up.  Most people just use something prewritten like uIP...

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