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Controlling Gates: Enabling and Disabling Circuits with Controlled Inverters

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This article explores the functionality of enabling and disabling circuits using gates and controlled inverters. It highlights the dual purpose of enable/disable signals: to block or unblock data signals from propagation and to turn logical devices on or off. We analyze input combinations to determine activation states for various gates and address timing waveforms for a 2-to-1 line multiplexer. Additionally, we discuss the importance of mutually exclusive enabling regions to prevent signal interference among multiple input channels, ensuring reliable circuit operation.

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Controlling Gates: Enabling and Disabling Circuits with Controlled Inverters

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  1. Controlling Gates Enabling/Disabling Circuits & Controlled Inverters

  2. The idea here is to block or unblock propagation signals

  3. An enable/disable signal serves two basic purposes: 1) One is to block /unblock a data signal from further propagation. 2) The other one is to logically turn on/off logical devices (systems/subsystems)

  4. What input combination of the enable signals will activate this gate?

  5. {es1, es0} = {0, 1}

  6. Determine the enabling input combination for these gates

  7. {es2, es1, es0} = {1, 0, 1} {es3, es2, es1, es0} = {0, 1, 0, 1}

  8. Timing Waveform of a 2-to-1 Line Multiplexer

  9. Timing Waveform of a 2-to-1 Line Multiplexer

  10. Multiple Input Channels to a Single Output Channel

  11. Can an OR gate can be used to combine different channels?

  12. No. The problem is that channels might subdue each other

  13. We may block a signal so that it does not subdue the other one

  14. We may block a signal so that it does not subdue the other one

  15. The enabling/disabling signals should be mutually exclusive. Why?

  16. Enable Regions do not overlap so we are fine

  17. Enable Regions overlap and this is a potential problem

  18. Setting en = e_ch0 = e_ch1’ will give us mutually exclusive signals

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