Can I make a special request to include a T gate (transmission gate) in that list as it is a critical and little understood component of an efficient NxN crossbar. 

Matrix form not butterfly style.

Butterfly style crossbar is much higher number of gates than a T Gate style crossbar.

Also T gates make for significantly reduced logic cells although voltage is lost at each stage, buffers fix that.


https://en.m.wikipedia.org/wiki/Transmission_gate



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