Thanks for the quick response,
I am right now working for a similar thing, i need to design and develope an PROFIBUS PA Slave interface, after preliminary R&D thru google, it feels like it may not be easy to implement using a Micro-controller and transceiver, so the implemenation i am looking right now is using a Link controller ASIC like the SPC4 from Siemens or UFC100 from Aniontek, with an MAU like SIM2-1 or the AMIS 4900, now my problem is where to buy the stack for these ASICs, till now i got only 1 vendor ie. softing , but there support is not all that great for India.
So did you use any these asics for your implementation? if yes where did you buy the stack from, also feel free to share any other info on the above topic.
regards