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Computer Architecture

• Course name: Computer Architecture
• Code discipline: XXX
• Subject area:

Short Description

This course covers the following concepts: The fundamental principles for modern computer systems; Computer instructions, their representation, and execution; Computer arithmetics.

Course Topics

Course Sections and Topics

Section	Topics within the section
Introduction to the Fundamental Concepts of Computer Architecture	Key Components of a Computer System Fundamental Ideas of Computer Architecture Translation Hierarchy of a High-Level Program into Machine Code Performance Metrics of a Computer System
Computational Logic Implementation in a Computer System	Logic Gates and Boolean Algebra Logic Circuits Combinational and Sequential Logic Number Systems The Basics of Verilog Hardware Description Language (HDL) Programming
Instruction Representation and Execution in a Computer System	Instruction Set Architecture (ISA) The Overview of MIPS ISA Types of MIPS Instructions and Their Representation in a Binary Format Sample MIPS Assembly Programs
Computer Arithmetics	Basic Arithmetic Operations (Bitwise, Shifts, Multiplication, Division, and Others) Overflow and Underflow Problems for Arithmetic Operations Arithmetic Operations with Floation Point Numbers Problems Related to Precision and Conversion for Floating Point Numbers
Processor Architecture	Key Components of a Processor: Control and Arithmetic Logic Unit, Registers Processor Datapath and Control Signals The Notion of a Pipelined Execution, Pipeline Hazards, and Their Solutions A Simple and Pipelined Implementation Schemes of a Processor
Advanced Topics	Computer Security and Vulnerabilities Graphics Processing Unit (GPU) and General-Purpose GPU Programming Modern Approaches for Memory Hierarchy Design

Intended Learning Outcomes (ILOs)

What is the main purpose of this course?

The course covers the fundamental principles of computer systems design. We first overview the key hardware components of a modern computer system, available performance metrics, and the general principles of computer architecture. We then discuss the representation and execution of computer instructions, instruction set architecture, the translation hierarchy of a high-level program into machine code. We also cover the elements of computer arithmetics, logic circuits, including combinational and sequential logic circuits. These theoretical principles are illustrated by using MIPS instruction set architecture, FPGA, and Verilog HDL programming language during the labs. We then study in details simple and pipelined implementation schemes of a processor, the idea of a pipelined execution, related hazards and their solutions. We complete the course by introducing several advanced topics, including computer security and vulnerabilities, GPU programming, and modern principles for memory hierarchy design.

ILOs defined at three levels

Level 1: What concepts should a student know/remember/explain?

By the end of the course, the students should be able to ...

• Key components of a modern computer system
• Available performance metrics for computer systems
• Computer arithmetics operations, including floating point numbers
• Number systems and conversion between them
• Representation formats for computer instructions

Level 2: What basic practical skills should a student be able to perform?

By the end of the course, the students should be able to ...

• Fundamental principles of computer architecture (Moore’s law, memory hierarchy, multiprocessing, speculative execution, and others)
• The design scheme of a modern processor
• The interaction principles between software and hardware
• Program representation and execution by a computer system

Level 3: What complex comprehensive skills should a student be able to apply in real-life scenarios?

By the end of the course, the students should be able to ...

• The design skills of logic circuits by using Verilog HDL programming language
• FPGA programming by using Quartus Prime software
• MIPS assembly programming (including MARS simulator)

Grading

Course grading range

Grade	Range	Description of performance
A. Excellent	90-100	-
B. Good	70-89	-
C. Satisfactory	60-69	-
D. Poor	0-59	-

Course activities and grading breakdown

Activity Type	Percentage of the overall course grade
Labs/seminar classes	20
Interim performance assessment	40
Exams	40

Resources, literature and reference materials

Open access resources

• Handouts supplied by the instructor
• Online resources shared by instructor

Teaching Methodology: Methods, techniques, & activities

Activities and Teaching Methods

Teaching and Learning Methods within each section

Teaching Techniques	Section 1	Section 2	Section 3	Section 4	Section 5	Section 6
Development of individual parts of software product code	1	1	1	1	1	1
Homework and group projects	1	1	1	1	1	1
Midterm evaluation	1	1	1	1	1	1
Testing (written or computer based)	1	1	1	1	1	1
Oral polls	1	1	1	1	1	1
Discussions	1	1	1	1	1	1

Activities within each section

Learning Activities	Section 1	Section 2	Section 3	Section 4	Section 5	Section 6
Question	0	1	0	0	0	0

Formative Assessment and Course Activities

Ongoing performance assessment

Section 1

Activity Type	Content	Is Graded?
Question	Do you agree that main memory (RAM) is a non-volatile memory?	1
Question	There are several types of memory available for computers, such as CPU cache, main memory (RAM), SSD, etc. What are the key differences between them?	1
Question	What is the key principle behind the Von Neumann Architecture?	1
Question	Specify a correct order for tools used during high-level program translation and execution: Compiler, Assebler, Linker, Loader;	1
Question	Let a program run on a computer comprised of one processor only. Let us now increase the number of processors up to m>1, so that multiple instructions of that program can be executed in parallel. Assume that all processor speeds are the same. Do you agree that a program can never execute slower on m processors, as compared to the case of one processor?	1
Question	Demonstration and description of key elements of an FPGA board (memory unit, PCI slot, clock generator, etc.);	0
Question	Description of specific features of FPGA as compared to other integrated circuit devices;	0
Question	Writing basic code for FPGA board;	0
Question	Configuration and usage of the basic functionality in Quartus Prime software	0

Section 2

Activity Type	Content	Is Graded?
Question	Convert decimal number 123 into base-5 format;	1
Question	Do you agree that a S/R latch and a D flip-flop have different storage capacities?	1
Question	Choose the key differences between SRAM and DRAM memory types: cost, power consumption, volatility, access speed, storage capacity, etc.;	1
Question	Do you agree that one of the key differences between sequential and combinational logic circuits is the presence of memory elements?	1
Question	Questions regarding the basic logic gates;	0
Question	Assignments to design simple logic circuits with 2-3 logic gates on a white board;	0
Question	Programming assignments in Quartus Prime software, to design and compile simple logic circuits;	0
Question	Programming an FPGA board by using Verilog HDL in Quartus Prime environment, such as turning on or off leds based on a switch position;	0
Question	Questions regarding the difference between combinational and sequential logic circuits;	0

Section 3

Activity Type	Content	Is Graded?
Question	How many bits are in one MIPS word?	1
Question	Which MIPS directive would you use to create a string data?	1
Question	For MIPS instruction set architecture (ISA), each register is reserved for a specific purpose. Describe the purpose of registers listed below: ${\displaystyle v0,}$ s0-${\displaystyle s7,}$ t0-$t7;	1
Question	In MARS simulator for MIPS programming, all register values, that are displayed in the register viewer, start with prefix "0x". What is the meaning of this prefix?	1
Question	Print a "Hello, World!" message in a console;	0
Question	Computation of a simple arithmetic expression for integer parameters;	0
Question	Computation of the first 10 Fibonacci numbers;	0
Question	Implementation of more advanced program structures, such as conditional loops	0

Section 4

Activity Type	Content	Is Graded?
Question	Assume that two MIPS registers, ${\displaystyle s0and}$ s1, contain the following binary data: ${\displaystyle s0:00100000;}$ s1: 01010101 (For simplicity, we assume 8-bit registers, rather that 32) What is the value of ${\displaystyle s1aftertheexecutionofthefollowinginstruction?:sll}$ s1, $s0, 4	1
Question	What is a "register spilling" in the context of MIPS instruction set architecture?	1
Question	Do you agree with the following statement? In some cases, MIPS logical shift operations, sll and srl, can be used as an efficient alternative to multiplication and division operations, mul and div.	1
Question	Do you agree that overflow and underflow exceptions correspond to cases, when the result of an arithmetic operation surpasses and subceeds, respectively, the maximum and the minimum value for an appropriate data type returned by that arithmetic operation?	1
Question	Division of two floating-point numbers;	0
Question	Conversion of Fahrenheit into Celsius temperature, and vice versa;	0
Question	Computation of a sphere surphase area;	0
Question	Questions regarding the execution of arithmetic operations with interger and floating-point values	0

Section 5

Activity Type	Content	Is Graded?
Question	Do you agree that the key motivation for the CPU pipelining is to speed-up the execution of a program by exploring multiple CPU cores?	1
Question	Which CPU block(s) is/are accessed during the execution of the following instruction? lw ${\displaystyle 1,5(}$ 2)	1
Question	What are 5 major stages of a pipelined instruction execution?	1
Question	Do you agree that, for a processor with 5 pipelined stages, the number of concurrently executed instructions is up to 4?	1
Question	There are several types of processors available, including single-cycle and multicycle.The major advantage of a single-cycle processor is the simplicity of its design. But what is its key drawback?	1
Question	Design of a testbench in ModelSim for Quartus Prime programming environment;	0
Question	The design of Half-Adder, Full-Adder, Ripple Carry Adder by using Verilog HDL in Quartus Prime	0
Question	Testing the correctness of Verilog HDL design by using ModelSim	0

Section 6

Activity Type	Content	Is Graded?
Question	Cold boot attack explores vulnerabilities in a memory dump mechanism. What is a memory dump?	1
Question	Below is a list of possible vulnerability attacks. Choose the one(s) that explore(s) vulnerabilities in a speculative execution of modern processors: Meltdown, Foreshadow, Cold boot attack, Spectre, No choice is correct;	1
Question	Choose the most precise definition for a side-channel attack: An attack that explores vulnerabilities in the hardware implementation of a computer system, An attack that explores vulnerabilities in the software components of a computer system;	1
Question	Do you agree that Meltdown and Spectre vulnerabilities both explore race conditions in existing memory circuits?	1
Question	Programming assignment to implement Multiplexor using Verilog HDL in Quartus Prime;	0
Question	Performance optimization of a Verilog HDL design;	0
Question	The design of a simple Arithmetic-Logic Unit (ALU);	0
Question	Revision questions	0

Final assessment

Section 1

1. Briefly describe the principles of Von Neumann architecture. Illustrate with a diagram.
2. Describe the steps that transform a program written in a high-level language such as C into a representation that is directly executed by a computer processor. Illustrate with a diagram; provide a brief description for each step.
3. Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2. Answer the following questions: a) Which processor has the highest performance expressed in instructions per second? b) If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions. c) We are trying to reduce the execution time by 30% but this leads to an increase of 20% in the CPI. What clock rate should we have to get this time reduction?

Section 2

1. Prove that the AND and NOT logic gates can be implemented by using only the NOR logic gate.
2. What are the S/R latch and D latch? Draw the respective logic circuits. Describe the differences between them.
3. Briefly describe the key difference(s) between combinational and sequential logic circuits.
4. Define what a multiplexor logic circuit is (with an arbitrary number of inputs). Provide a truth table for a 2-to-1 multiplexor. Provide a logic circuit implementing a 2-to-1 multiplexor, that uses AND, NOT, and OR logic gates. Describe a Verilog module implementing such a logic circuit of a 2-to-1 multiplexor.

Section 3

1. Translate the following MIPS code to C (or pseudocode). Assume that variables f, g, h, and i are assigned to registers ${\displaystyle s0,}$ s1, ${\displaystyle s2,and}$ s3, respectively. Code to translate: sub ${\displaystyle t0,}$ s1, ${\displaystyle s2;addi<math>t0,}$ t0, 3; add ${\displaystyle s0,}$ s3, </math>t0
2. Assume that two MIPS registers, ${\displaystyle {\textstyle s0and}}$ s1, contain the following binary data (for simplicity, we assume 8-bit registers, rather that 32): ${\displaystyle s0:00100000;}$ s1: 01010101. What is the value of register ${\displaystyle s1aftertheexecutionofthefollowingMIPSinstruction?:sll}$ s1, $s0, 4.
3. List and describe the purpose of general-purpose MIPS registers.

Section 4

1. Briefly describe the overflow and underflow problems for arithmetic operations.
2. Describe the difference between executing arithmetic operations with integers and floating-point values for a MIPS processor.
3. What is a precision problem for a floating-point operation?

Section 5

1. What is a Program Counter (PC) register of a processor?
2. Describe the principle of a pipelined CPU execution. Provide a diagram illustrating the concept. Briefly describe the 5 key stages of a classical pipeline.
3. What are the key differences between Control Unit (CU) and Arithmetic Logic Unit (ALU) of a processor? Which purposes do they serve?
4. What is a CPU datapath?

Section 6

1. What is an out-of-order execution? What hardware features of CPU implementation, in addition to an out-of-order execution, are exploited by Meltdown vulnerability? How serious is Meltdown vulnerability?
2. What is an instruction-level parallelism?
3. Describe the idea of a general-purpose GPU programming.
4. Briefly explain the working principles of a CPU cache.
5. Discuss advantages and drawbacks of a hierarchical memory model for computer systems.

The retake exam

Section 1

Section 2

Section 3

Section 4

Section 5

Section 6