Section 8 - Boolean Algebra
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What 3 gates make up a full adder?
AND OR XOR
What type of logical circuit is a D-type flip-flop?
A sequential logic circuit
What is needed to change the state of D-type flip-flops?
A clock or an oscillator
What does the D in D-type flip-flop stand for?
Data or delay
What is meant by a positive edge-triggered flip-flop? (D-type flip-flop)
A D-type flip-flop can only change the output value from 0 to 1 or vice versa when the clock is at a rising or positive edge. i.e. at the beginning of a clock period.
What is meant by a rising or positive edge in a clock cycle?
On a diagram depicting the change in state of a clock, a rising or positive edge is the one that shoots up from 0 to 1. It represents the start of a clock period.
Why are D-type flip-flops important?
They can store the state of a bit and act as memory.
What happens in a D-type flip-flop when the clock is not at a positive edge?
The input value in the flip-flop is held and does not change.
How is Q (the output) related to D (the input) and C (the clock) in a D-type flip-flop?
The output Q assumes the value currently at D whenever the clock reaches a rising edge
Where are flip-flops used in modern CPUs?
The registers in the CPUs are all multiple flip-flops constructed in a row to store temporary information within a processor.