SI (Serial In) Sh (Shift Enable) L(Load Enable) CLK Paraner Output Q3 Q2 Q1 20 A A A 4-bit Parallel-In, Parallel-Out Shift Register Q3 D3 D2 D₁ Do Parallel Input (a) Block diagram SO (Serial Out) 20 00 00 00 00 01 01 DQ SI 10 10 D Q 10 DQ 10 D Q 11 11 11 11 D3 D2 D₁ Do Sh L CLK (b) Implementation using flip-flops and MUXes

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Use D flip-flops to design a mod-16 binary down counter, whose counting sequence is 1111->1110->1101->1100->1011-> … ->0000->1111…. Derive the logic expressions for the D inputs of the flip-flops and draw the circuit diagram.

SI (Serial In)
Sh (Shift Enable)
L(Load Enable)
CLK
Paraner Output
Q3 Q2 Q1 20
A A A
4-bit Parallel-In,
Parallel-Out
Shift Register
Q3
D3 D2 D₁ Do
Parallel Input
(a) Block diagram
SO (Serial Out)
20
00
00
00
00
01
01
DQ
SI
10
10
D Q
10
DQ
10
D Q
11
11
11
11
D3
D2
D₁
Do
Sh
L
CLK
(b) Implementation using flip-flops and MUXes
Transcribed Image Text:SI (Serial In) Sh (Shift Enable) L(Load Enable) CLK Paraner Output Q3 Q2 Q1 20 A A A 4-bit Parallel-In, Parallel-Out Shift Register Q3 D3 D2 D₁ Do Parallel Input (a) Block diagram SO (Serial Out) 20 00 00 00 00 01 01 DQ SI 10 10 D Q 10 DQ 10 D Q 11 11 11 11 D3 D2 D₁ Do Sh L CLK (b) Implementation using flip-flops and MUXes
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