(i) For the following 4-bit input bit sequences in the ordered format (EN_L,N3, N2, N1,NO), determine which output pin DECxy_L is asserted, giving your final answer as a number combination xy. Briefly explain your reasoning and show all your working for each case. a) (1,0,1,0,1) B) (0,1,0,1,0) (ii) For the decoder shown in Figure 3.2, determine the Boolean expression for asserting DEC14_L as a function of all inputs to the decoder.

(i) For the following 4-bit input bit sequences in the ordered format (EN_L,N3, N2, N1,NO), determine which output pin DECxy_L is asserted, giving your final answer as a number combination xy. Briefly explain your reasoning and show all your working for each case. a) (1,0,1,0,1) B) (0,1,0,1,0) (ii) For the decoder shown in Figure 3.2, determine the Boolean expression for asserting DEC14_L as a function of all inputs to the decoder.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Code Conversion

The method or technique used to convert code from one format to another is termed code conversion. Code conversions are most commonly used in computers, digital electronics, microprocessors, etc.

Question

(c) Figure 3.2 shows a 74x138-based ROM decoder.
NO
N1
N2
N3
EN L
+5V
a) (1,0,1,0,1)
B) (0,1,0,1,0)
R
1
G1
G2A
G2B
A
B
U
74x138
с
A
B
с
G1
G2A
G2B
YO
Y1O
Y2 o
Y3
Y4 O
Y5
Y6
Y7 O
U1
74x138
YO
Y1
Y3 O
Y4
Y5
Y6
Y7
15
U2
13
12
Y2 O
11
10
15
14
13
12
11
10
9
DECO_L
DEC1_L
DEC2 L
DEC3_L
DECA_L
DEC5_L
DEC6_L
DEC7_L
DEC8 L
DEC9_L
DEC 10 L
DEC11 L
DEC12 L
DEC13_L
DEC14_L
DEC 15 L
Figure 3.2
(i) For the following 4-bit input bit sequences in the ordered format
(EN_L,N3, N2, N1,NO), determine which output pin DECxy_L is asserted, giving your
final answer as a number combination xy. Briefly explain your reasoning and show
all your working for each case.
(ii)
For the decoder shown in Figure 3.2, determine the Boolean expression for
asserting DEC14_L as a function of all inputs to the decoder.

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