tristate_bit - Place a signal on an I/O pin only when enabled, similar to a tristate buffer in electronics
loadrt tristate_bit [count=N|names=name1[,name2...]]
If enable is TRUE, copy in to out.
tristate-bit.N.in bit in
tristate-bit.N.out bit io
tristate-bit.N.enable bit in
When TRUE, copy in to out