Computer Architecture · Unit 3 · 8 hrs
Basic Computer Organization and Design
Exam-focused notes for Basic Computer Organization and Design (Computer Architecture, CSC213): what the TU syllabus asks and how it has actually been tested, with 11 solved past questions from this unit.
What this unit covers
- Instruction Code
- Operation Code
- Stored Program Concept
- Registers and memory of Basic Computer
- Common Bus System for Basic Computer
- Instruction Format
- Instruction Set Completeness
- Control Unit of Basic Computer
- Control Timing Signals
- Instruction Cycle of Basic computer
- Determining Type of Instruction
- Memory Reference Instructions
- Input-Output Instructions
- Program Interrupt & Interrupt Cycle
- Description and Flowchart of Basic Computer
Instruction Format
What is instruction format? Explain instruction formats of basic computer and give two examples of each type of instructions. [5]
An instruction format is the layout or structure that defines how the bits of an instruction word are organized and interpreted by the processor. It specifies the fields within an instruction, such as the opcode, address, and mode bits, so that the control ...
Full solved answer →Explain the instruction format of basic computer. Write down symbolic representation for FETCH routine.[10]
The basic computer has three instruction code formats, each consisting of a total of 16 bits. --- Field Bits Size Purpose ---------------------------- I (Mode bit) 15 1 bit Addressing mode (0 = Direct, 1 = Indirect) Opcode 12 - 14 3 bits Specifies the opera...
Full solved answer →Instruction Cycle of Basic computer
What microoperations are performed in fetch phase of instruction cycle of basic computer? Explain with suitable circuit diagram. [5]
A microoperation is an elementary operation performed on data stored in registers (e.g., add, subtract, load, clear, shift). The fetch phase retrieves the next instruction from memory and prepares it for decoding and execution. --- The fetch phase occurs at...
Full solved answer →Common Bus System for Basic Computer
Explain common bus system of basic computer with a diagram. [5]
The common bus system is used in a basic computer to facilitate efficient communication between registers and memory. Instead of connecting every register to every other register with individual wires (which increases hardware complexity), a single shared b...
Full solved answer →Explain common bus system for basic computer. [5]
The common bus system is a shared communication pathway used in a basic computer to transfer information between registers and memory efficiently. Instead of connecting every register to every other register with individual wires (which would require enormo...
Full solved answer →Explain the bus interconnection scheme with diagram. [5]
A bus is a set of conducting wires (lines) that connect multiple components of a computer system and serve as a shared communication pathway for transferring data, addresses, and control signals between the CPU, memory, and I/O devices. --- A typical bus in...
Full solved answer →Program Interrupt & Interrupt Cycle
Draw an instruction cycle state diagram with interrupt and explain it. [5]
--- When the computer starts, the following registers are initialized: - SC (Sequence Counter) is cleared to 0 - IEN (Interrupt Enable flip-flop) is cleared to 0 - R (Interrupt Request flip-flop) is cleared to 0 --- The instruction cycle begins with fetch a...
Full solved answer →Explain the input-output interrupt with example. [6]
An input-output interrupt is a mechanism by which an I/O device signals the CPU that it requires attention (i.e., it has completed a data transfer or is ready for the next one), causing the CPU to temporarily suspend its current program, service the I/O req...
Full solved answer →Registers and memory of Basic Computer
Explain the computer components. [5]
A computer is a digital system that performs various computational tasks. It is composed of several key components that work together to execute instructions and process data. --- The CPU is the brain of the computer. It performs all processing tasks. It co...
Full solved answer →Stored Program Concept
Explain the store-program concept with example. [5]
The stored-program concept is the idea that both instructions (program) and data are stored together in the same memory unit of a computer. The CPU fetches instructions one by one from memory, decodes them, and executes them sequentially. This concept forms...
Full solved answer →Instruction Code
Write short notes on: a. Data communication processor b. Computer Instructions [6]
--- A Data Communication Processor (also called an Input/Output Processor - IOP) is a specialized processor that handles data transfer between the CPU/memory and I/O devices, without the direct involvement of the CPU. - The IOP is similar to a CPU in that i...
Full solved answer →Make Unit 3 stick
Practice CSC213 with flashcards & quizzes