ID:13029 Converted the fanout from the always-disabled tri-state buffer "<name>" to the node "<name>" to VCC
CAUSE: The output of an always-disabled tri-state buffer is
Z
, but the specified buffer feeds logic or an open-drain buffer. The Quartus Prime software converted the specified buffer to
VCC
as a don't care minimization. For example, this situation occurs in the following design:
module test2 (input data, output out);
wire tribuf, gnd;
assign gnd = 1'b0;
assign tribuf = gnd ? data : 1'bz;
OPNDRN my_opndrn(tribuf, out);
endmodule
Here, the always-disabled tri-state buffer tribuf
is feeding an open-drain buffer, and hence is converted into VCC
. ACTION: To remove this warning, remove the always-disabled tri-state buffer from the design.