As you know, these kinds of tools are for system modeling that use TLM2 Methodologies for interconnecting IPs and etc. I have searched the web (and also eetop) for learning materials about TLM but there are really few resources and I found that the coding style for TLM is the most complex one that makes people even advanced developers get confused even when they are reading the codes not developing them. I thought these stuffs might be useful for people who want to enter to the ESL world. I also suggest you to test Mentor Vista. As the company has said, it is the most complete tool related to ESL field in the market.