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Wired ORed and Wired ANDed

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Ericwatson

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What kind of logic chips are wired ORed and Wired ANDed internally. Any Advantage of using IC chips wired ORed or Wired ANDed. Instead of using Tri-state buffer the designer would wire the outputs of logic chips either OR'ed or AND'ed.
 

This would be an interesting question to ask in the ASIC section of the forum, due it is related to library-cell design, but as far as I can see, there is no apparent reason to prevent make the bolean logic with passive components.
 

interrupts are a good example of internal/external wired-OR/AND logic and they are typically implemented with open-collector/open-drain output drivers. All the outputs are tied together and a pullup is used to obtain a high level. If any driver is actively driving the signal (low) the output goes low (like a multi-input AND gate).

I don't think this is common practice to do inside an IC as it's more efficient to use a gate to AND those interrupts.
 

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