Question 3: JK-FF Below are the logic symbol and IC diagram of the JK-FF. LOGIC

Question

Question 3: JK-FF Below are the logic symbol and IC diagram of the JK-FF. LOGIC SYMBOL Vcc CD1 CP K2 CD2CP2 J2 14 13 121 109 CP CP CD CD 13 23 456 VcC PIN 14 GND PIN7 J1Q1 Q1 Notes: CD stands for Clear, CP stands for Clock -Pin 2 of the chip is Q1_bar, and pin 3 is Q1 Complete the truth table of JK-FF by following the following explanations (Use Q prev and Q bar_prev to denote the Q and Qbar values in the last iteration) The outputs Q and Q bar only depend on inputs J and K when the CLK is on the negative edge When the CLK is not on an edge, outputs Q and Q bar do not change values If J 0, K0, then Q value stays the same - If J 0, K -1, then Q becomes 0 - If J-1, K -0, then Q becomes 1. If J 1, K1, then Q value flips, i.e. if Q 0 now, Q will change to 1. CLK Edge Edge Edge Edge Non-edge _Q prev Non-edge Non-edge Non-edge Q bar 0 0 0 0 0 Q bar prev 0 0

Explanation / Answer

J

K

CLK

Q

Q_BAR

0

0

EDGE

Q_prev

Q_bar_prev

1

0

EDGE

1

0

0

1

EDGE

0

1

1

1

EDGE

Toggle Q_prev

Toggle Q_bar_previous

0

0

NON- EDGE

Q_prev

Q_bar_prev

1

0

NON- EDGE

Q_prev

Q_bar_prev

0

1

NON- EDGE

Q_prev

Q_bar_prev

1

1

NON- EDGE

Q_prev

Q_bar_prev

J

K

CLK

Q

Q_BAR

0

0

EDGE

Q_prev

Q_bar_prev

1

0

EDGE

1

0

0

1

EDGE

0

1

1

1

EDGE

Toggle Q_prev

Toggle Q_bar_previous

0

0

NON- EDGE

Q_prev

Q_bar_prev

1

0

NON- EDGE

Q_prev

Q_bar_prev

0

1

NON- EDGE

Q_prev

Q_bar_prev

1

1

NON- EDGE

Q_prev

Q_bar_prev

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