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COA511S - COMPUTER ORGANISATION AND ARCHITECTURE - 2ND OPP - JAN 2024 |
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nAmlBIA unlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF COMPUTING AND INFORMATICS
DEPARTMENTOF COMPUTERSCIENCE
QUALIFICATION:BACHELOROF COMPUTERSCIENCE,BACHELOROF COMPUTERIN CYBER
SECURITY& BACHELOROF INFORMATICS
QUALIFICATIONCODE: 07BACS,07BCCS&
07BAIF
LEVEL:5
COURSE:COMPUTERORGANISATION
AND ARCHITECTURE
COURSECODE:COA511S
DATE: JANUARY2024
PAPER:THEORY
DURATION: 2H00
MARKS: 100
SECONDOPPORTUNITY/SUPPLEMENTARYEXAMINATION QUESTIONPAPER
EXAMINER(S) MR. JULIUSSILAA
MS. JOVITA MATEUS
MS. VICTORIASHAKELA
MS. HELENAHAINANA
MR. THOMAS SHOMWELE
MODERATOR: MR. SEBASTIANMUKUMBIRA
THIS QUESTIONPAPERCONSISTSOF 5 PAGES
(Excluding this front page)
INSTRUCTIONS
1. Answer ALL the questions on the answer scripts.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLEMATERIALS
1. Calculator.
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SECTION A (15 MARKS]: Each Question Weighs 1 Marie.
Indicate whether each of the following statements is True or False.
1 The raw speed of the microprocessor will not achieve its potential unless it is fed a
constant stream of work to do in the form of computer instructions
[True]/False)
2. Pipelining is a means of introducing parallelism into the essentially sequential
nature of Machine-instruction program
[True/False]
3. RISCprocessors are more responsive to interrupts because interrupts are checked
between rather elementary operations
[True/False]
4. Machine parallelism exists when instructions in a sequence are independent and thus
can be executed in parallel by overlapping
[True/False]
1. Organizational attributes include hardware details transparent to the programmer.
[True/False]
2. The Instruction Set Architecture (ISA) defines the machine language
instructions that a computer can follow.
[True/False]
7. Cache memory is a much faster memory than the register file.
[True/False]
8. Overflow can only occur if there is a carry.
[True/False]
9. Interrupt is one of the five states for a process.
[True/False)
10 Memory swapping is a situation where none of the processes in memory are in the
ready state.
[True/False)
11 A sequence of hexadecimal digits can be thought of as representing an integer
in base 2.
[True/False]
12. The instruction set is the programmer's means of controlling the processor.
[True/False]
13. Memory references are faster than register references.
[True/False)
14. The Kernel is a special type of programming language used to provide instructions to
the monitor.
[True/False]
15. The speed of a processor is dictated by the pulse frequency produced by the clock,
measured in cycles per second, or Hertz (Hz).
[True/False]
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SECTION B [15 MARKS): Each Question Weighs 1 Marl<.
Choose the correct answer for each of the following:
1. The _____
measures the ability of a computer to complete a single task.
A. clock speed B. Speed metric
C. execute cycle D. Cycle time
2. The most fundamental type of machine instruction is the ____
instruction.
A. conversion B. data transfer
C. arithmetic D. logical
3. For ___
the address field references a main memory address and the
Referenced register contains a positive displacement from that address.
A. indexing B. base-register addressing
C. relative addressing D. all of the them
4. The ____
determines the opcode and the operand specifiers.
A. decode instruction B. fetch operands
C. calculate operands D. execute instruction
5. The situation where the second instruction needs data produced by the first
instruction to execute is referred to as ___
_
A. True data dependency B. Output dependency
C. Procedural dependency D. Antidependency
6.The ____
exists in one of two states and, in the absence of input, remains in that
state.
A. assert
C. decoder
B. complex PLO
D. flip-flop
7.____
are used in digital circuits to control signal and data routing.
A. multiplexers
C. flip-flops
B. program counters
D. gates
8.The ____
specifies the operation to be performed.
A. source operand reference B. opcode
C. next instruction reference D. processor register
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9. All instructions in the ARM architecture are ____
format.
A. 8
C. 32
8. 16
D. 64
bits long and follow a regular
10.The ----
processor.
controls the movement of data and instructions into and out of the
A. control unit
C. shifter
8. ALU
D. branch
11.The ____
contains the address of an instruction to be fetched.
A. instruction register
C. memory buffer register
8. memory address register
D. program counter
12.____
registers may be used only to hold data and cannot be employed in the
calculation of an operand address.
A. General purpose
C. Address
8. Data
D. Condition code
13. A ____
is a dispatch able unit of work within a process that includes a
processor context and its own data area for a stack.
A. Process
C. Thread
8. Process switch
D. Thread switch
14. A ____
architecture is one that makes use of more, and more fine-grained pipeline stages.
A. parallel
C. superscalar
8. superpipe lined
D. hybrid
15. Which of the following interrelated factors go into determining the use of the
addressing bits?
A. number of operands 8. number of register sets
C. address range D. all of the above
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SECTION C (70 MARKS]: Comprehension questions.
Question 1
a) A Tesla smartphone has 16GB of RAM. The memory in this phone is divided into
several words each 1024 bytes. How many bits are needed to address any single word in
this memory? Show your work step by step
(9 marks)
b) CPU is a vital computer resource and any good computing system should be design in
such way to utilise CPUefficiently. Contrast programmed 1/0from 1/0 channel.
Why the CPU usage by 1/0 channel CPU is more efficient than Programmed 1/0?
(6 marks)
Question 2
a) Explain your understanding of the following virtual memory concepts
i)
paging
ii)
demand paging
b)What is an ultimate importance of virtual memory management scheme?
(4 marks)
(4 marks)
Question 3
a) Name the following combinational circuit below
b) How does this combinational circuit work?
c) Provide one practical function of this circuit in a computer memory?
Ao (TI
At [TI
(2 marks)
(2 marks)
(2 marks)
• ~D2
----- ·-D .ill DJ
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d) Write a note on Boolean algebra, the Boolean identities, Sum of Product and how these
concepts combined can be applied to produce a digital circuit
(8 marks)
Question 4
a) Each instruction must contain the information required by the processor for execution.
Specify any four locations in a computer where source and result operands can be
found
(4 marks)
b) Provide an example of a low level computer instruction and briefly describe what this
instruction must specify.
(6 marks)
Question 5
c) The term addressing modes refers to the way in which the operand of an instruction is
calculated or specified by using register information or information contained within
the instruction or elsewhere. Provide an example of
d) the simplest form of addressing mode where the required data(operand) is present in
the instruction itself
(3 marks)
e) register Addressing Mode
(3 marks)
f) relative addressing mode
(6 marks)
Question 6
a) CPU executes predefined operations called instructions. For example by opening a
WhatsApp messenger application on your mobile phone several things happen for you
to be able to interact with this application.
Discussthe various stages of instruction processing
(6 marks)
b) Program Status Word (PSW) is a register or set of registers that contain various process
status information. List and briefly describe any 5 Common status flags (5 marks)
*****END OF PAPER*****
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