Routing fabric (programmable interconnect)
Beginner
The wires and switches that join an FPGA’s blocks. Most of the chip is wires and switches.
Novice
All the wire segments and programmable switches that connect logic blocks, memory, DSP blocks and pins. It takes most of an FPGA’s area and most of its delay.
Expert
Island-style channels of W tracks of mixed segment lengths, connection boxes (Fc) and switch boxes (Fs). Most configuration bits and 60–70% of power sit in it.
Explained in Lookup tables and the FPGA fabric (Architectures).
See also: Switch box (switch block), Configuration memory.