ID:13046 Tri-state node(s) do not directly drive top-level pin(s)

CAUSE: The design contains tri-state nodes that drive non-tri-state logic, but the chip does not support internal tri-states. As a result, the Quartus Prime software converts all the tri-state nodes feeding internal logic to an equivalent logic. For example, in the following design, the fan-out from the node tribuf to the AND gate is converted to an OR gate.

	module test1 (input oe1, data1, in, output out, inout bidir); 
	wire tribuf, tmp; 
	assign tribuf = oe1 ? data1 : 1'bz; 
	and(tmp, in, tribuf); 
	assign bidir = tribuf; 
	assign out = tmp; 
	endmodule 

               

In the following design, the node triwire is converted to a selector.

	module test2 (input oe1, data1, oe2, data2, in, output out); 
	wire triwire, tmp; 
	assign triwire = oe1 ? data1 : 1'bz; 
	assign triwire = oe2 ? data2 : 1'bz; 
	and(tmp, in, triwire); 
	assign out = tmp; 
	endmodule 

               

See the sub-messages below to view a list of the affected tri-state nodes and a more detailed Help.