Digital Logic
Tri-State
A logic state (high-impedance or 'Z') where a driver disconnects from a bus, allowing other drivers to control it.
Detailed Explanation
Tri-state outputs can be 0, 1, or high-impedance (Z). In Z state, the output presents no load and doesn't affect the bus. This enables multiple drivers on shared buses—only one drives at a time; others are tri-stated.
Tri-state buses are less common in modern design due to complexity and testing challenges. Multiplexed buses or point-to-point links with arbiters are preferred alternatives.