Other gate-level cells

Other gate-level cells
yosys> help $_TBUF_

A tri-state buffer.

Truth table:    A E | Y
               -----+---
                a 1 | a
                - 0 | z
Properties:

is_evaluable

Simulation model (verilog)
Listing 363 simcells.v
473module \$_TBUF_ (A, E, Y);
474    input A, E;
475    output Y;
476    assign Y = E ? A : 1'bz;
477endmodule