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3.2. Logic Gates and Logic Circuits
A subsection of Computer Science, 9618, through 3. Hardware
Listing 10 of 16 questions
This truth table represents a logic circuit. INPUT OUTPUT A B C D Z Write the Boolean logic expression that corresponds to the given truth table as the sum‑of‑products. Z = Complete the Karnaugh map (K‑map) for the given truth table. AB CD Draw looparound appropriate groupin the K‑map to produce an optimal sum‑of‑products. Write the Boolean logic expression from your answer to part as a simplified sum‑of‑products. Z = Use Boolean algebra to give your answer to part in its simplest form. Z =
9618_s23_qp_32
THEORY
2023
Paper 3, Variant 2
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A greenhouse has an automatic window. The window (operates according to the following criteria: Parameter Description of parameter Binary value Condition T Temperature Too high Acceptable W Wind speed Too high Acceptable R Rain Detected Not detected M Manual override On Off The window opens (X = 1) if: • the temperature is too high and the wind speed is acceptable • and • rain is not detected, or the manual override is off. Draw a logic circuit to represent the operation of the window. X T W R M Complete the truth table for the logic expression: X = NOT (A OR B OR C) AND (B NOR C) A B C Working space X Embedded systems contain Read Only Memory (ROM) and Random Access Memory (RAM). Explain the reasons why ROM is used in an embedded system.
9618_w22_qp_12
THEORY
2022
Paper 1, Variant 2
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Questions Discovered
16