Universal gates, self-documenting version

This project is an enhanced version of unigate-gf.

In normal mode, it contains four independent universal logic gates:

• U₂₁ on input pins 5-8 and output pin 32
• U₃₁ on input pins 9-14 and output pin 33
• U₄₁ on input pins 15-24 and output pin 34
• U₂₂ on input pins 25-30 and output pins 35-36

where U_ij can be suitably wired to power, ground and inputs such that it implements any particular Boolean function on i inputs and j outputs.

There is an additional mux that selects one of the outputs of the above U₂₂ based on input pin 31 and outputs it on pin 37. This allows us to transform U₂₂ into another instance of U₃₁.

In reference mode, it uses a lookup table to tell us how to wire the universal gates to achieve a specific Boolean function.

• setting input pins 5-6 and 31 and clearing input pins 7-8 activates reference mode (this particular combination is never needed in normal mode)
• use input pins 9-10 to select one of U₂₁, U₃₁, U₄₁, U₂₂
• use input pins 11-26 to specify the truth table of the Boolean function
• use input pins 27-30 to specify the input pin number to be wired
• signal on output pin 32 means the selected pin should be wired to ground
• signal on output pin 33 means the selected pin should be wired to power
• signal on output pins 34-37 mean the selected pin should be wired to the inputs 1-4 of the Boolean function respectively