I don't think I've asked for anything particularly unusual?
It's common for electronics manufacturers to release diagrams like this: http://i.imgur.com/k6o8mwO.png detailed enough to give you an idea of how the circuit behaves and why, but well short of a complete internal schematic for the entire device.
Google "Xilinx FPGA cell" https://www.google.co.uk/search?tbm=isch&q=xilinx+fpga+cell and you'll find similar approximate diagrams exist for FPGA cells. That's the detail level I'm interested in, and I think it's reasonable enough to believe it would exist?
Those cell diagrams are very abstract illustrations of the underlying functionality and are in some parts even wrong [1]. The level you have to be looking at to find out more about short-circuits (transistors and their interconnections), is very much a secret.
[1] "Wrong" in the sense that they are only proper abstractions for the officially supported functionality. For example, the DSP48E blocks of the Xilinx Virtex-5 can be chained for higher precision, but if you interpret the diagrams literally and try to build unsupported functions, it won't work as you expect.
What I suspect is happening is that the good old tristate bus can't be turned round fast enough for highspeed designs so some sort of mux network has been built to replace it. The place to look is probably in the patents.
It's common for electronics manufacturers to release diagrams like this: http://i.imgur.com/k6o8mwO.png detailed enough to give you an idea of how the circuit behaves and why, but well short of a complete internal schematic for the entire device.
Google "Xilinx FPGA cell" https://www.google.co.uk/search?tbm=isch&q=xilinx+fpga+cell and you'll find similar approximate diagrams exist for FPGA cells. That's the detail level I'm interested in, and I think it's reasonable enough to believe it would exist?