382 Unit 12 FIGURE 12-10 Parallel-In, Parallel-Out Right-Shift Register Cengage Learning 2014 SI Sh L CLK D3 00 01 10 11 SI (Serial In) Sh (Shift Enable) L (Load Enable) CLK DQ D₂ 11 Parallel Output Q3 Q2 Q1 Qo A A 4-bit Parallel-In, Parallel-Out Shift Register A D3 D2 D1 Do Parallel Input (a) Block diagram DQ D₁ 00 01 10 11 SO (Serial Out) DQ Do

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Redesign the right-shift register circuit of figure 12-10 (photo included) using four D flip-flops with clock enable, four 2-to-1 MUXes and a single OR gate.

382 Unit 12
FIGURE 12-10
Parallel-In,
Parallel-Out
Right-Shift
Register
Cengage Learning 2014
SI
Sh
L
CLK
f
D3
00
01
10
11
SI (Serial In)
Sh (Shift Enable) →
L (Load Enable)
CLK
23
DQ
D₂
00
01
10
11
Parallel Output
Q3 Q2 Q1 Qo
4-bit Parallel-In,
Parallel-Out
Shift Register
D3 D2 D1 Do
Parallel Input
(a) Block diagram
22
DQ
D₁
00
01
10
11
SO (Serial Out)
9₁
DQ
(b) Implementation using flip-flops and MUXes
Do
00
01
10
20
DQ
Transcribed Image Text:382 Unit 12 FIGURE 12-10 Parallel-In, Parallel-Out Right-Shift Register Cengage Learning 2014 SI Sh L CLK f D3 00 01 10 11 SI (Serial In) Sh (Shift Enable) → L (Load Enable) CLK 23 DQ D₂ 00 01 10 11 Parallel Output Q3 Q2 Q1 Qo 4-bit Parallel-In, Parallel-Out Shift Register D3 D2 D1 Do Parallel Input (a) Block diagram 22 DQ D₁ 00 01 10 11 SO (Serial Out) 9₁ DQ (b) Implementation using flip-flops and MUXes Do 00 01 10 20 DQ
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