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Questions and Answers
In a vehicle access control system, what input signals are considered?
In a vehicle access control system, what input signals are considered?
- Entrance request (correct)
- Gate lower and upper positions (correct)
- Vehicle speed
- Vehicle present within the gate area (correct)
What is necessary for a vehicle access control system to function correctly?
What is necessary for a vehicle access control system to function correctly?
Memory
In sequential systems, output values at time t are only dependent on input values at time t.
In sequential systems, output values at time t are only dependent on input values at time t.
False (B)
A sequential system can generate and detect sequences, such as detecting the sequence ___ if x(t-3) = 1, x(t-2) = 5, x(t-1) = 5, and x = 7.
A sequential system can generate and detect sequences, such as detecting the sequence ___ if x(t-3) = 1, x(t-2) = 5, x(t-1) = 5, and x = 7.
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Study Notes
Motivation for Sequential Circuits
- Digital systems increasingly require sequential circuits due to the need for outputs to depend on past input signals, not just current inputs.
- A vehicle access control system illustrates this concept, using multiple input signals: entrance request, gate positions (lower and upper), and vehicle presence in the gate area.
- Outputs in such systems, like motor controls (on/off, up/down), are contingent on the sequence of events rather than instantaneous inputs.
Behavior of Sequential Systems
- Output values at a specific time (t) rely on input values from the same moment and previous moments (t-1, t-2, etc.).
- Sequential systems are capable of generating and detecting sequences, making them essential for applications needing memory.
- An example of sequence detection in a circuit shows how it can recognize the sequence "1557" by checking conditions at various time steps (e.g., x(t-3), x(t-2), x(t-1), and current x).
Need for Memory in Processes
- The requirement for memory is evident in situations where processes must wait for specific events to complete before responding to new inputs.
- In the vehicle access example, an entrance request will not be fulfilled until the previous sequence of operations (e.g., gate opening and ensuring a clear area) is fully executed.
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