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Altera_Forum
Honored Contributor
Honored ContributorCan I safely ignore warning that output pin cannot be tristated?
Dear all, I have the following code for driving the output and input of my design:
Fout_DATA <= DATA;
Fout_BE <= BE;
Fout_RXF <= RXF;
Fout_TXE <= TXE;
WR <= Fin_WR;
DATA(31 downto 16) <= i...
Altera_ForumHonored Contributor
Honored ContributorHi,
The issue here is that you are driving a tri-stated signal to a normal IO pin. When the Bidir/Tri signal DATA is tristated ('Z'), the Fout_Data (normal IO) driver can't drive that onto the pin since it is not declared as Tri/Bidir. This kind of logic should ideally not be done in tri/bidir designs as you will loose the Tristate/Bidir functionality of the signal being driven.
