ID:13045 Converted the fanout from the always-enabled tri-state buffer "<name>" to the node "<name>" into a wire
CAUSE: The specified always-enabled tri-state buffer feeds a non-tri-state logic, an open-drain buffer, or an output pin. The Quartus Prime software converted the fanout from this tri-state buffer to the specified node into a wire. For example, consider the following design that gives the above warning:
module test1 (input data1, output out); wire tribuf, vcc; assign vcc = 1'b1; assign tribuf = vcc ? data1 : 1'bz; assign out = tribuf; endmoduleHere, the always-enabled tri-state buffer tribuf feeds an output pin, and therefore is converted to a wire. Now consider the following design:
module test2 (input data1, data2, output out1, inout bidir); wire tribuf, vcc; assign vcc = 1'b1; assign tribuf = vcc ? data1 : 1'bz; and (tmp, data2, tribuf); assign out1 = tmp; assign bidir = tribuf; endmoduleHere, the always-enabled tri-state buffer tribuf feeds an AND gate in addition to feeding a bidirectional pin, so its fanout to the AND gate is converted into a wire. Finally, consider the following design:
module test3 (input data1, output out); wire tribuf, opndrn, vcc; assign vcc = 1'b1; assign tribuf = vcc ? data1 : 1'bz; assign opndrn = !tribuf ? !vcc : 1'bz; assign out = opndrn; endmoduleHere, the always-enabled tri-state buffer tribuf feeds an open-drain buffer, and hence is converted into a wire.
ACTION: Avoid this warning message by removing the fanout of the always-enabled tri-state buffer to the specified node. Otherwise, no action is required.