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Tristate Logic

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A2

The Bus

This is a collection of wires (often 4, 8, 16, 32, 64 or 128). These wires are used to interconnect all the devices within a computer. This approach greatly reduces the complexity and amount of wiring needed. Many devices share the same bus instead of each device having its own wiring. To make this work, tristate logic is needed.

Tristate Logic

TristateLatch.gif

Tristate Logic used for BUS Sharing

Tristate Buffer

Bus Contention

Microcontroller I/O Ports

This is the circuit showing two tristate buffers. Only one is ever active. In this way data can flow in or out but never at the same time.

TristateIO.gif

 

 

 

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