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Controlling Gates

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Controlling Gates. Enabling/Disabling Circuits & Controlled Inverters. The idea here is to block or unblock propagation signals. An enable/disable signal serves two basic purposes: 1) One is to block /unblock a data signal from further propagation.

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Controlling Gates

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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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