Tri-state buffer

Dear Cris,

Thanks for your reply,

May be a diagram(tri-state) would better illustration the behavior, do you means by the signal below circle is understood that the OR gate is not needed?

As since there is no “real” user-define name, they uses the names of one of its single tri-buffers as follow.

warning: the following tri-state node(s) did not directly drive top-level pin(s)

warning: converted the fanout from the tri-state buffer "inst" to the node "inst2" into an or gate

Btw, how would be the equation below? Since it is using bidirectional for the first non-tri-state, would the equation still be inst + inst1 = inst2

Thanks again

Best regards

ken