Docsity
Docsity

Prepare-se para as provas
Prepare-se para as provas

Estude fácil! Tem muito documento disponível na Docsity


Ganhe pontos para baixar
Ganhe pontos para baixar

Ganhe pontos ajudando outros esrudantes ou compre um plano Premium


Guias e Dicas
Guias e Dicas

Flip flops - flip flop T, D, JK, Slides de Sistemas de Comunicação Digital

Flip flops matéria sistema digitais

Tipologia: Slides

2023

Compartilhado em 16/04/2025

dirce-ramalho
dirce-ramalho 🇧🇷

2 documentos

1 / 30

Toggle sidebar

Esta página não é visível na pré-visualização

Não perca as partes importantes!

bg1
Figure 7.1 Control of an alarm system
Memory
element Alarm
Sensor
Reset
Set
On Off

pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e

Pré-visualização parcial do texto

Baixe Flip flops - flip flop T, D, JK e outras Slides em PDF para Sistemas de Comunicação Digital, somente na Docsity!

Figure 7.1 Control of an alarm system

Memory

element

Alarm

Sensor

Reset

Set

On Off

Figure 7.2 A simple memory element

A B

Figure 7.4 A memory element with NOR gates

Reset

Set Q

Figure 7.5 A latch built with NOR gates

S R Q a Q b 0 0 0 1 1 0 1 1 0/11/ 0 1 1 0 0 0 (a) Circuit (b) Truth table Time 1 0 1 0 1 0 1 0 R S Q (^) a Q (^) b Q a Q b (c) Timing diagram R S t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 (no change)

Figure 7.7 Gated SR latch with NAND gates

S

R

Clk

Q

Q

Figure 7.8 Gated D latch

Q
S
R

Clk

D

(Data) D Q Clk Q Clk D 0 1 1 x 0 1

Q  t + 1  Q  t 

(a) Circuit

(b) Truth table (c) Graphical symbol

t (^) 1 t (^) 2 t (^) 3 t (^) 4 Time Clk D Q

(d) Timing diagram

Q

Figure 7.11 A positive-edge-triggered D flip-flop

D Clock P P P P 5 6 1 2 3 (a) Circuit D Q Q (b) Graphical symbol Clock Q Q 4

Figure 7.12 Comparison of level-sensitive and edge-triggered

D

Clock Q (^) a Q (^) b

D Q
Q

(b) Timing diagram

D Q
Q
D Q
Q
D

Clock (^) Q (^) a Q (^) b Q c Q (^) c Q (^) b Q (^) a

(a) Circuit

Clk Q (^) c

Figure 7.14 Positive-edge-triggered D flip-flop with Clear and Preset

Preset Clear

D

Clock

(a) Circuit

(b) Graphical symbol

Q
Q

Clear Preset D Q Q

Figure 7.15 Synchronous reset for a D flip-flop

D C lock (^) Q Q C lear D Q Q

Figure 7.17 JK flip-flop

D Q Q Q Q J Clock

(a) Circuit

J Q Q K 0 1

Q t + 1 

Q  t

0

(b) Truth table (c) Graphical symbol

K J 0 0 1 0 1

1 1 Q  t

K

J Q

Q

K

Q t + 1 

Q  t

JK flip-flop (b) Truth table

J

1 1 Q t 

K

T Q Q T 0 1 Q  t + 1  Q  t  Q  t^  (b) Truth table

T flip-flop

Preset Clear

Positive-edge-triggered D flip-

flop with Clear and Preset

D Q
Q
D Q
Q

Master-slave D flip-flop

D Q

Clk Q Clk D 0 1 1 x 0 1

Q  t + 1  Q  t 

(b) Truth table

Gated D latch

S Q Q Clk R

Gated SR latch

S R x x 0 0 0 1 1 0 Q( t ) (no change) 0 1 Clk 0 1 1 1 1 1 1 Q (^)  t + (^1)  Q( t ) (no change) x S R Q a Q b 0 0 0 1 1 0 1 1 0/11/ 0 1 1 0 0 0 (a) Circuit (b) Truth table Q a Q b R S (no change)

Figure 7.19 A simple shift register

Q 3 Q 2 Q 1 Q 0

Clock Parallel input Parallel output Shift/Load Serial input

D Q
Q
D Q
Q
D Q
Q
D Q
Q

Figure 7.20 A three-bit up-counter

T Q

Clock Q

T Q
Q
T Q
Q
Q 0 Q 1 Q 2

(a) Circuit

Clock Q 0 Q 1 Q 2 Count 0 1 2 3 4 5 6 7 0

(b) Timing diagram