4. FIGURE 1 shows how a 3 to 8 line decoder (TTL 74138) can be used in conjunction with NAND gate (TTL 74133) to connect a set of switches to the data bus of a microprocessor system via buffers (TTL 74367). Answer the following questions relating to the diagram: a) What address, in HEX, is required on the address bus in order toread the switches? b) RD and MEMRQare control lines from the CPU. What must their logic state be in order to read the switches?
4. FIGURE 1 shows how a 3 to 8 line decoder (TTL 74138) can be used in conjunction with NAND gate (TTL 74133) to connect a set of switches to the data bus of a microprocessor system via buffers (TTL 74367). Answer the following questions relating to the diagram: a) What address, in HEX, is required on the address bus in order toread the switches? b) RD and MEMRQare control lines from the CPU. What must their logic state be in order to read the switches?
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:4. FIGURE 1 shows how a 3 to 8 line decoder (TTL 74138) can be used in conjunction with NAND gate (TTL
74133) to connect a set of switches to the data bus of a microprocessor system via buffers (TTL 74367).
Answer the following questions relating to the diagram:
a) What address, in HEX, is required on the address bus in order toread the switches?
b) RD and MEMRQare control lines from the CPU. What must their
logic state be in order to read the switches?
Data bus
74 367
74 133
74 138
A15
D7
DO
EN
EN
Address
bus
MEMRQ
A4
A1
A0
EN
TRUTH TABLE
CBA|O 12 3 4 5
0 0 00 111 1 1 11
0 0
6
110 1 1 1 1 1 1
0 1 01 10 1 1 1 1 1
0 1 11 1 10 1 1 1 1
1 0 01 1 1101 1 1
10 11 1 1 1 101 1
1 101 1 1 1 1 1 0 1
1 1 11 1 1 1 1 1 1 0
74 367
(part of)
FIGURE 1
Data enable
Data outputs
Input switches
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