Systems Architecture
7th Edition
ISBN: 9781305080195
Author: Stephen D. Burd
Publisher: Cengage Learning
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Question
Chapter 3, Problem 1RQ
Program Plan Intro
Number Representation:
- The base of the number in mathematical expressions is specified by a subscript.
- Example:
- In “
- In “
- In “
- In “
- The base of the number can also be explicitly represented by placing a letter at the end.
- Example:
- The letter “H” at the end of the number “5324H”, is denotes that the number “5324” is a hexadecimal number.
- The letter “B” at the end of the number “1011B”, is denotes that the number “1011” is a binary number.
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Consider the following sequential circuit:
CLOCK
a. Define the diagram circuit variables (5 pts)
b. Derive the Flip-Flop input equations) (5 pts)
c. Derive the circuit output equation (5 pts)
d. Derive the state table of the circuit (5 pts)
e. Derive the state diagram for this circuit (5 pts)
Clk
A
D
B
B'
CIK
Question 2 (25 pts)
A sequential circuit with two D flip-flops A and B, two inputs x and y, and one output z is
specified by the following next-state and output equations:
A(t + 1) = xy' + xB
B(t + 1) = xA + xB'
z = A
a. Draw the logic diagram of the circuit. (5 pts)
b. List the state table for the sequential circuit. (10 pts)
c. Draw the corresponding state diagram. (10 pts)
5. Word FrequencyWrite a program that reads the contents of a text file. The program should create a dictio-nary in which the keys are the individual words found in the file and the values are the number of times each word appears. For example, if the word “the” appears 128 times, the dictionary would contain an element with 'the' as the key and 128 as the value. The program should either display the frequency of each word or create a second file containing a list of each word and its frequency.
3.) File Encryption and DecryptionWrite a program that uses a dictionary to assign “codes” to each letter of the alphabet. For example:
codes = { ‘A’ : ‘%’, ‘a’ : ‘9’, ‘B’ : ‘@’, ‘b’ : ‘#’, etc . . .}Using this example, the letter A would be assigned the symbol %, the letter a would be assigned the number 9, the letter B would be assigned the symbol @, and so forth.
The program should open a specified text file, read its contents, then use the dictionary to write an encrypted version of the file’s contents to a second file. Each character in the second file should contain the code for the corresponding character in the first file.
Write a second program that opens an encrypted file and displays its decrypted contents on the screen.
Chapter 3 Solutions
Systems Architecture
Ch. 3 - Prob. 1VECh. 3 - Prob. 2VECh. 3 - A(n) __________ is an integer stored in double the...Ch. 3 - Prob. 4VECh. 3 - Assembly (machine) language programs for most...Ch. 3 - Prob. 6VECh. 3 - Prob. 7VECh. 3 - Prob. 8VECh. 3 - Prob. 9VECh. 3 - A(n) __________ is an array of characters.
Ch. 3 - Most Intel CPUs use the __________, in which each...Ch. 3 - Prob. 12VECh. 3 - A(n) __________ contains 8 __________.Ch. 3 - Prob. 14VECh. 3 - The result of adding, subtracting, or multiplying...Ch. 3 - Prob. 16VECh. 3 - Prob. 17VECh. 3 - Prob. 18VECh. 3 - Prob. 19VECh. 3 - Prob. 20VECh. 3 - Prob. 21VECh. 3 - Prob. 22VECh. 3 - ___________ occurs when the result of an...Ch. 3 - In a CPU, _______ arithmetic generally is easier...Ch. 3 - In the ________, memory addresses consist of a...Ch. 3 - Prob. 26VECh. 3 - Data represented in ________ is transmitted...Ch. 3 - Prob. 28VECh. 3 - Prob. 29VECh. 3 - A(n) ____________ is one instance or variable of a...Ch. 3 - Prob. 1RQCh. 3 - Why is binary data representation and signaling...Ch. 3 - Prob. 3RQCh. 3 - Prob. 4RQCh. 3 - Prob. 5RQCh. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - Why doesnt a CPU evaluate the expression 'A' = 'a'...Ch. 3 - Prob. 9RQCh. 3 - What primitive data types can normally be...Ch. 3 - Prob. 11RQCh. 3 - How is an array stored in main memory? How is a...Ch. 3 - Prob. 14RQCh. 3 - Prob. 1PECh. 3 - Prob. 2PECh. 3 - Prob. 4PECh. 3 - Prob. 5PECh. 3 - Prob. 6PECh. 3 - Prob. 1RPCh. 3 - Prob. 2RPCh. 3 - Prob. 3RP
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