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Friday, June 10, 2016

Controlled Buffer/Inverter

The controlled buffer and inverter, often called three-state buffers/inverters, each have a one-bit "control" input pin on the south side. The value at this control pin affects how the component behaves:
When the value on this pin is 1, then the component behaves just like the respective component (a buffer or a inverter (NOT gate)).
When the value is 0 or unknown (i.e., floating), then the component's output is also floating.
When the value is an error value (such as would occur when two conflicting values are being fed into the input), then the output is an error value.
Controlled buffers can be useful when you have a wire (often called a bus) whose value should match the output of one of several components. By placing a controlled buffer between each component output and the bus, you can control whether that component's output is fed onto the bus or not.

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