[moftz]

Probably the highest level of abstraction for Verilog is using something like Altera's IP cores. They are binary blobs intended for a specific FPGA model that can be hooked up like any other module but they are configurable for things like bandwidth, latency, and various inputs. You can use things like floating point arithmetic modules or cores used to create things like phase locked loops, a way to convert an input frequency to a different frequency typically using a multiplier and divider. You don't need to know how these modules work underneath, its proprietary anyway but there are usually reference designs you can look at. For example, with a few clicks you can create something like a VGA driver that could interface with a synthesized CPU to create a terminal for it. You can do some neat things with IP cores but there are probably some issues with using them in a commercial form.