sequential

sequential - RS Latches William Shoaff [email protected]

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Unformatted text preview: RS Latches William Shoaff [email protected] http://www.cs.wds.edu/~wds/classes/comp-org/Logic/sequential/ 1 Cross-coupled NOR gates • Input to leftmost gate is S = 0, Q = 0; output is ¯ Q = S + Q = 1 • Input to rightmost gate is ¯ Q = 1, R = 0; output is Q = ¯ Q + R = 0 2 The Set Switch • Now set the S switch The Set Switch • Now set the S switch • This sets ¯ Q off, setting Q and the light on The Set Switch • Now set the S switch • This sets ¯ Q off, setting Q and the light on 3 The Set Switch • Now consider what happens when S is turned off The Set Switch • Now consider what happens when S is turned off • The output ¯ Q remains on and the light remains on The Set Switch • Now consider what happens when S is turned off • The output ¯ Q remains on and the light remains on • Now the switch at S has no effect on the circuit 4 The Reset Switch • The circuit can be reset by flipping the R switch on The Reset Switch • The circuit can be reset by flipping the R switch on • The light goes off 5 The Reset Switch • And setting R = 0 keeps the light off • Now the switch at R has no effect on the circuit 6 Latches and Flip-Flops • The circuit has two stable states Latches and Flip-Flops • The circuit has two stable states • Such a circuit is called a flip-flop or latches Latches and Flip-Flops...
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sequential - RS Latches William Shoaff [email protected]

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