Computer Architecture: Encoders, Adders, CPU

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Questions and Answers

What is the primary function of an encoder in the context of binary logic?

  • To convert multiple inputs into fewer ouputs. (correct)
  • To decode encrypted data.
  • To amplify the input signal.
  • To convert fewer inputs into multiple outputs.

In binary arithmetic, which operation is typically performed using 2's complement?

  • Multiplication
  • Division
  • Subtraction (correct)
  • Addition

What is the role of the Arithmetic Logic Unit (ALU) within a CPU?

  • Performing arithmetic and logical operations (correct)
  • Managing memory addresses
  • Holding temporary data
  • Directing the execution of instructions

Which of the following is a characteristic of assembly language?

<p>It uses mnemonics to represent machine code instructions. (B)</p>
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Which of the following represents the correct sequence of steps in CPU instruction execution?

<p>Fetch -&gt; Decode -&gt; Execute -&gt; Store (D)</p>
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What is the purpose of a full adder in binary arithmetic?

<p>Adds two bits and a carry-in. (D)</p>
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In the context of 2's complement subtraction, what is the first step?

<p>Invert the bits of number B and add 1. (B)</p>
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What is the primary difference between a multiplexer (MUX) and a demultiplexer (DEMUX)?

<p>A MUX selects one of many inputs to a single output; a DEMUX directs a single input to one of many outputs. (A)</p>
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Which of the following registers is typically used to hold the address of the next instruction to be executed?

<p>PC (Program Counter) (C)</p>
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In CPU architecture, what is the role of the Control Unit?

<p>To direct the execution of instructions (B)</p>
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What is the primary advantage of using assembly language over machine code?

<p>Improved readability and maintainability (D)</p>
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In the ARM assembly instruction MOV R0, #5, what is the operation being performed?

<p>Moving the immediate value 5 into register R0 (A)</p>
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Which component of a basic computer organization is responsible for facilitating communication between the CPU, memory, and I/O devices?

<p>Buses (B)</p>
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Which of these operations is NOT typically part of binary arithmetic?

<p>Trigonometry (B)</p>
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How does a decoder differ functionally from an encoder?

<p>A decoder converts fewer inputs into more outputs, and an encoder converts multiple inputs into fewer outputs. (D)</p>
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When performing subtraction using 2's complement arithmetic, what should be done with the carry-out?

<p>The carry-out should be ignored. (B)</p>
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In the MIPS assembly instruction lw $t0, 0($s0), what operation is being performed?

<p>Loading a word from the memory address stored in $s0 into register $t0. (D)</p>
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What is the key role of the Memory Address Register (MAR) in basic computer organization?

<p>To store the address of the memory location to be accessed. (A)</p>
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Which of the following best describes the relationship between assembly language and machine language?

<p>Assembly language is a symbolic representation of machine language. (A)</p>
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What is the significance of mnemonics in assembly language programming?

<p>They represent machine code instructions in a human-readable form. (B)</p>
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What is the primary purpose of the Instruction Register (IR) in a CPU?

<p>To store the instruction that is currently being executed. (A)</p>
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In complex binary arithmetic operations, what is one reason for using 2's complement representation?

<p>To handle both addition and subtraction with the same circuitry. (A)</p>
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How does the function of a demultiplexer (DEMUX) relate to its use in memory addressing?

<p>A DEMUX routes a single data input to one of several memory locations based on the address. (B)</p>
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Consider a system using both a multiplexer (MUX) and a demultiplexer (DEMUX) for data transmission. Where would you typically find the MUX placed in relation to the DEMUX?

<p>The MUX is typically placed on the transmitting end to combine multiple data streams; the DEMUX is on the receiving end to separate them. (B)</p>
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Given the ARM assembly instruction ADD R1, R0, #2, what potential issue must be considered when executing this instruction in a pipelined processor?

<p>Data dependencies between R0 and R1 (B)</p>
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In modern CPU design, how does the separation of the ALU and Control Unit contribute to improved performance?

<p>By allowing parallel execution of arithmetic operations and instruction management. (B)</p>
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What is a primary challenge in implementing subtraction using 2's complement in hardware, considering potential overflow conditions?

<p>Detecting overflow requires additional complex circuitry. (C)</p>
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Why is the Program Counter (PC) crucial for the correct sequencing of instructions in modern CPUs?

<p>It ensures that instructions are executed in the order they appear in memory. (C)</p>
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In an advanced computer architecture, if the Memory Address Register (MAR) fails, what is the most likely immediate consequence?

<p>The system will be unable to access memory locations correctly. (D)</p>
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Which of the following is NOT a typical characteristic of registers within a CPU?

<p>Large storage capacity (C)</p>
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What critical role do buses play in enabling scalable and modular computer system designs?

<p>They provide standardized interfaces for connecting various components. (D)</p>
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Considering both ARM and MIPS assembly languages, what is a key architectural difference that influences their assembly instruction sets?

<p>ARM uses a complex instruction set (CISC), while MIPS uses a reduced instruction set (RISC). (A)</p>
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How would an error in the 'Decode' stage of a CPU's instruction execution cycle most likely manifest itself?

<p>The wrong operation might be performed, leading to unpredictable behavior. (D)</p>
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In the context of CPU registers, what is the most significant trade-off when increasing the number of general-purpose registers in a CPU design?

<p>Increased power consumption due to more complex register management. (B)</p>
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If a CPU's ALU were redesigned to completely eliminate dedicated hardware multiplication and division circuits, how would this change most directly impact software execution?

<p>It would force software to implement multiplication and division using iterative addition and subtraction, significantly slowing those operations. (A)</p>
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Imagine a scenario where a critical fault in the Control Unit causes it to misinterpret instruction opcodes. What is the most catastrophic potential outcome?

<p>The CPU might start executing arbitrary memory locations, leading to a complete system compromise. (B)</p>
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Consider a novel computer architecture where the traditional separation between CPU and Memory is blurred, with computational elements embedded directly within the memory modules. What fundamental programming paradigm shift would be necessary to fully exploit this architecture's capabilities?

<p>A shift to data-centric programming where computations are moved to the data instead of vice versa. (A)</p>
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Flashcards

Binary Encoder

Converts multiple inputs to fewer outputs (e.g., 8->3).

Binary Decoder

Converts fewer inputs to more outputs (e.g., 3->8).

Half Adder

Adds two single bits, outputting the sum and carry.

Full Adder

Adds two bits and a carry-in bit, producing a sum and carry-out.

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Binary Arithmetic

Performing arithmetic operations (addition, subtraction, multiplication, division) using binary numbers.

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Subtraction with 2's Complement

Invert bits of number B (1's complement), add 1 to get 2's complement, then add to A, ignoring carry-out.

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Multiplexer (MUX)

Many inputs are connected to a single output, using a selector signal.

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Demultiplexer (DEMUX)

A single input is routed to one of many outputs.

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Basic Computer Organization

CPU, Memory, I/O, and Buses.

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Important registers

Registers that include Memory Address Register (MAR), Memory Data Register (MDR), Program Counter (PC), and Instruction Register (IR).

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Registers

Temporary storage for data within CPU.

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ALU (Arithmetic Logic Unit)

Performs arithmetic and logical operations.

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Control Unit

Directs the execution of instructions.

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Assembly Language

Mnemonics such as ADD, SUB, MOV, which are closer to machine language.

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CPU Instruction Execution

Fetch -> Decode -> Execute -> Store cycle.

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Study Notes

Binary Encoder & Decoder

  • Encoder converts multiple inputs to fewer outputs; for example, it converts 8 inputs to 3 outputs
  • Decoder converts fewer inputs to more outputs; for example, it converts 3 inputs to 8 outputs

Binary Adders and Subtractors

  • Half Adder adds 2 bits, resulting in a sum and a carry
  • Full Adder adds 2 bits and a carry-in
  • Subtraction is done via 2's complement

Binary Arithmetic

  • Includes performing addition, subtraction, multiplication, and division in binary

Subtraction with 2's Complement

  • Invert the bits of the number B (1's complement), then add 1 to get the 2's complement
  • Add the result to A and ignore any carry-out

Multiplexer & Demultiplexer

  • MUX takes many inputs and produces 1 output using a selector
  • DEMUX takes 1 input and produces many outputs

Basic Computer Organization

  • Includes the CPU, Memory, I/O, and Buses
  • Uses Registers such as MAR, MDR, PC, and IR

CPU Architecture

  • Registers are temporary data holders
  • ALU performs operations
  • Control Unit directs execution

Assembly Language

  • Uses mnemonics such as ADD, SUB, and MOV
  • Closer to machine language

CPU Instruction Execution

  • Instructions are executed in the following order: Fetch, Decode, Execute, Store

ARM vs MIPS Assembly

  • ARM Assembly example: MOV R0, #5 | ADD R1, R0, #2
  • MIPS Assembly example: add $t0, $t1, $t2 | lw $t0, 0($s0)

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