Quartus

Tri-state bus fed by primitive <type> <name>, but can be fed only by tri-state primitive

CAUSE: You fed a primitive that is not a TRI primitive to a tri-state bus, but tri-state buses can only be fed by tri-state primitives.
ACTION: Two primitives are driving the same wire, causing the line to become a tri-state bus. If this is what you intended, add a tri-state primitive (such as TRI or OPNDRN) between the bus and the other primitive. If you did not intend to create a tri-state bus, correct the netlist so that only one primitive drives the wire.

- PLDWorld -

 
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