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Posts Tagged ‘VU.CS501-.Advance. Computer. Architecture .Midterm .Special .2006’

VU CS501-Advance Computer Architecture Midterm Special 2006

.

CS501-Advance Computer Architecture

Midterm Special 2006

Q1

_____________all memory systems are dumb, in that they respond to only two

commands: read or write

Virtually

Logically

Physically

None of These

Q2

Consider two programs having three types of instructions given as follows:

[10]

Number of

Data transfer instructions

Control instructions

ALSU instructions

Program 1

7

3

6

Program 2

12

5

3

Compare both the programs for the following parameters:

1. Instruction count ( IC )

2. Speed of execution ( ET )

Q3

To access an operand in memory, the CPU must first generate an address, which it then

issues to the __________

MEMORY

REGISTER

DATA BUS

ALL OF ABOVE

Q4

___________ or Branch instructions affect the order in which instructions are performed,

or control the flow of the program

Control

DATA MOVMENT

Arithmetic

LOGICAL

Q5

Reverse assemble the following SRC machine language instructions:

[10]

68C2003A h

 

Q6

An instruction that specifies one operand in memory and one operand in a register would

be known as a __________ address instruction.

2-1/2

1-1/2

0

2

Q7

The data movement instructions ___________ data within the machine and to or from

input/output devices

Store

LOAD

MOVE

NONE OF ABOVE.

Q8

Write short answers to the following questions: [3 x 5]

a. What is the advantage of a linker in the development of assembly language

programs?

Solution:-

The linker:

When developing large programs, different people working at the same time can

develop separate modules of functionality. These modules can then be ‘linked’ to

form a single module that can be loaded and executed. The modularity of

programs, that the linking step in assembly language makes possible, provides the

same convenience as it does in higher-level languages; namely abstraction and

separation of concerns. Once the functionality of a module has been verified for

correctness, it can be re-used in any number of other modules. The programmer

can focus on other parts of the program. This is the so-called “modular” approach,

or the “top-down” approach.

b. Define term “Single stepping”.

Solution:-

Single stepping:

Single stepping and breakpoints that allow the examination of the status of

the program and registers at desired points during execution.

c. Define term “Type checking”.

Solution:-

Type Checking:-

High-level languages provide various primitive data types, such as integer,

Boolean and a string, that a programmer can use. Type checking provides for the

verification of proper usage of these data types. It allows the compiler to determine

memory requirements for variables and helping in the detection of bad programming

practices.

On the other hand, there is generally no provision for type checking at the machine

level, and hence, no provision for type checking in assembly language. The machine only

sees strings of bits. Instructions interpret the strings as a type, and it is usually limited to

signed or unsigned integers and floating point numbers. A given 32-bit word might be an

instruction, an integer, a floating-point number, or 4 ASCII characters. It is the task of the

compiler writer to determine how high-level language data types will be implemented

using the data types available at the machine level, and how type checking will be

implemented.

d. Define term “Instruction set”.

Solution:-

Instruction Set

A collection of all possible machine language commands that a computer can understand

and execute is called its instruction set. Every processor has its own unique instruction

set. Therefore, programs written for one processor will generally not run on another

processor. This is quite unlike programs written in higher-level languages, which may be

portable. Assembly/machine languages are generally unique to the processors on which

they are run, because of the differences in computer architecture.

Three ways to list instructions in an instruction set of a computer:

·

·

·

by function categories

by an alphabetic ordering of mnemonics

by an ascending order of op-codes

e. Why computer logic design is different from classical logic design?

Solution:-

Classical logic design versus computer logic design:

The traditional sequential circuit design techniques for a finite state machine are not

very practical when it comes to the design of a computer, in spite of the fact that a

computer is a finite state machine. The reason is that employing these techniques is

much too complex as the computer can assume hundreds of states.

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