ID:13028 Removed fan-out from the always-disabled I/O buffer "<name>" to the node "<name>"
CAUSE: The specified tri-state buffer has its output-enable input tied to
GND
. This tri-state buffer will never provide any useful data to the node it feeds.As a result, the Quartus Prime software has removed this fan-in. For example, the following Verilog design gives this warning for the tri-state node triwire
:
module test1 (input data1, oe1, data2, inout bidir1);
wire triwire, gnd;
assign gnd = 1'b0;
assign triwire = oe1 ? data1 : 1'bz;
assign triwire = gnd ? data2 : 1'bz;
assign bidir1 = triwire;
endmodule
See the sub-messages below for a list of the affected nodes. ACTION: Remove the always-disabled tri-state buffers from the design or connect the output-enable inputs of these buffers to something other than GND
.