CONCEPT PRACTICE
Flip-flops and sequential circuits
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Question 1 of 8
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The figure shows an RS flip-flop using two NOR gates. Which of the following is the correct truth table for the flip-flop? Here, unchanged means the outputs maintain a previous state, and unstable means the outputs are in an unstable state. The upper NOR receives R and feedback from Q̅, and outputs Q. The lower NOR receives S and feedback from Q, and outputs Q̅. The feedback wires cross without a junction. Choice input columns are S, R; output columns are Q, Q̅. Each choice lists input pairs 00, 01, 10, 11 in that order.
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Source: Technology-01.pdf, PDF page 208. ID: HIST-TECH01-2007S-Q018. Explanation written for this textbook.