16 Flip-Flops - ECE 110 M.-C. Brunet Before we start....

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ECE 110 M.-C. Brunet Flip-flops Handout 16 Before we start…. timing issues (again!) g( g ) X Y F F is Boolean Output F = F(t) = X Y M.-C. BRUNET ECE 110 UIUC 16.1 F
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ECE 110 M.-C. Brunet Flip-flops Handout 16 In a circuit, identify combinational (called Boolean here) and sequential outputs! That will help you to fill in the timing diagrams. inputs inputs Flip-Flop outputs: clock Pulse (t) Pulse (t-1) ( Arrows show dependence) May change only at specific times (see triggering type). output (t) depends on inputs (t-1) and ff inputs ff inputs flip-flop output flip-flop output Boolean outputs: May change as soon as inputs change inputs inputs on output (t-1). (ignore ns delay). output (t) depends on inputs (t) Boolean output Boolean output (if ff is rising-edge) M.-C. BRUNET ECE 110 UIUC 16.2 Note : In all the circuits, initial values are given; The circuitry producing them is not shown (for clarity reasons). Example 1 : A rising edge triggered D ff. DQ Characteristic table: C clock he urrent depends on the ( D previous The output Q is Boolean / Sequential The current
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This note was uploaded on 09/16/2009 for the course ECE 110 taught by Professor Haken during the Spring '08 term at University of Illinois at Urbana–Champaign.

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16 Flip-Flops - ECE 110 M.-C. Brunet Before we start....

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