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Memory Mapped I/O in Computer Architecture

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Memory Mapped I/O in Computer Architecture

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Questions and Answers

What is the main disadvantage of Memory Mapped I/O according to the text?

It has no impact on the memory available for applications

It improves the speed of accessing memory for applications

It increases the memory available for applications

It reduces the memory available for applications (correct)

In Memory Mapped I/O, what could an address accessed by the CPU refer to, besides a portion of physical RAM?

Cache memory

Peripherals' control special registers (correct)

Secondary storage devices

Stack Pointer Register

Which type of ROM is programmed by the manufacturer and has a low production cost due to the manufacturing process used?

OTP (One Time Programmable)

SRAM (Static Random Access Memory)

Masked ROM (correct)

DRAM (Dynamic Random Access Memory)

What is the main distinguishing feature between DRAM and SRAM?

DRAM requires periodic refreshing while SRAM does not. (A) Signup and view all the answers

In the ATmega32 microcontroller, which memory locations address the internal data SRAM?

The next 2048 locations (A) Signup and view all the answers

What purpose does the Stack serve in memory units?

Store local variables and save context state during interrupts (A) Signup and view all the answers

What distinguishes SRAM from DRAM in terms of data retention?

DRAM requires periodic refreshing, while SRAM does not. (C) Signup and view all the answers

Which type of RAM is faster but has lower density compared to the other?

SRAM (D) Signup and view all the answers

What is the main disadvantage of SRAM compared to DRAM?

SRAM has lower density and is more expensive. (C) Signup and view all the answers

How do the structures of SRAM and DRAM differ?

SRAM uses a single capacitor and transistor for each memory cell, whereas DRAM uses six transistors. (A) Signup and view all the answers

Study Notes

Memory and Input/Output

The main disadvantage of Memory Mapped I/O is not specified in the provided text.

Memory Types and Access

In Memory Mapped I/O, an address accessed by the CPU can refer to a portion of physical RAM or a peripheral device.
In the ATmega32 microcontroller, memory locations address the internal data SRAM.

ROM Types

One type of ROM is programmed by the manufacturer and has a low production cost due to the manufacturing process used.

DRAM and SRAM Comparison

The main distinguishing feature between DRAM and SRAM is that DRAM needs to be refreshed periodically, while SRAM does not.
SRAM has high data retention, meaning it retains data as long as power is supplied, whereas DRAM loses data if not refreshed.
SRAM is faster but has lower density compared to DRAM.
The main disadvantage of SRAM compared to DRAM is its higher cost.

Memory Organization

The Stack serves as a region of memory that stores data and program instructions temporarily while they are being executed.

SRAM and DRAM Structures

The structures of SRAM and DRAM differ: SRAM uses flip-flops to store data, while DRAM uses capacitors to store electrical charges.

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Description

This quiz covers the concept of Memory Mapped I/O in computer architecture, where the same address bus is used to address peripherals, CPU registers, and memory. It explains how accessing addresses by the CPU can refer to physical RAM or peripherals control registers, and the need to reserve areas for I/O devices.