Brief explanation

Render FPGA LUTs as a digital circuit diagram.

Detailed Explanation

FPGA devices use look-up table (LUT) to implement arbitrary combinatorial logic.

for N bit LUT configuration can be represented as an 2^N long number.

Most typical LUTs are LUT4 with N = 4 with 2^N = 16 bit config word shown on the figure below.

Mux representation of LUT is not the most human-readable one.

Any configuration of the LUT can be rendered as a digital circuit diagram.

https://github.com/drom/icedrom -- is an JavaScript libratry that can render LUT config as digital circuit diagram.

Read more HERE https://observablehq.com/@drom/lut4-decoder