Memory Types in Microprocessor Systems
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Questions and Answers

What is the range of addresses for locations in microprocessor systems?

  • 0 to 4096
  • 0 to 255
  • 0 to 65535 (correct)
  • 0 to 1024

Which type of memory is commonly used for storing programs and data in a computer?

  • ROM
  • NVRAM
  • EEPROM
  • RAM (correct)

What does EPROM stand for?

  • Erasable-Persistent Random Only Memory
  • Electrically Programmable Read Only Memory
  • Efficient Programmable Read Only Memory
  • Erasable-Programmable Read Only Memory (correct)

How is an interface defined in the context of microprocessor systems?

<p>Interface is the path for communication between two components. (D)</p> Signup and view all the answers

What does a decoding circuit do in the context of microprocessors?

<p>Selects the corresponding memory chip or I/O device based on address sent by the microprocessor. (D)</p> Signup and view all the answers

What is the purpose of matching memory requirements with microprocessor signals in interfacing?

<p>To ensure proper communication between memory and the microprocessor. (C)</p> Signup and view all the answers

What is the purpose of address decoding in interfacing circuits?

<p>To generate chip select signals for each device in the system (D)</p> Signup and view all the answers

Why is it necessary to have an appropriate address decoding strategy?

<p>To ensure that only one memory-mapped component is accessed for a given valid address (A)</p> Signup and view all the answers

How does address decoding contribute to selecting the right device in a system?

<p>By generating chip select signals from the address bus (C)</p> Signup and view all the answers

In what way is memory space not homogenous even if it is flat?

<p>Different portions are used for different purposes such as RAM, ROM, and I/O (B)</p> Signup and view all the answers

Why is it essential for one and only one memory-mapped component to be accessed for a given valid address?

<p>To avoid conflicts and ensure accurate data access (D)</p> Signup and view all the answers

What is the maximum addressable space in this example?

<p>1024 bytes (B)</p> Signup and view all the answers

Where do the RAM chips come in relation to the ROM chip in the memory map?

<p>Before the ROM chip (A)</p> Signup and view all the answers

What is the size of each RAM chip in this example?

<p>128B (D)</p> Signup and view all the answers

Where does the memory map start for these chips?

<p>$0000 (C)</p> Signup and view all the answers

What does the symbol $ signify in the memory address values provided?

<p>Hexadecimal value (A)</p> Signup and view all the answers

How are the address bus lines split in a microprocessor?

<p>Into most significant bits (MSB) for generating CS* signals and least significant bits (LSB) for internal addresses (D)</p> Signup and view all the answers

In the example microprocessor with 10 address lines, how many chips are needed if each chip is 128 bytes?

<p>8 chips (D)</p> Signup and view all the answers

How many address lines are required to select each of the 8 chips in the microprocessor example?

<p>3 lines (A)</p> Signup and view all the answers

In Full Address Decoding strategy, how are the address lines utilized?

<p>All address lines are used to specify a memory/device's location (D)</p> Signup and view all the answers

What is the purpose of Partial Address Decoding in generating chip select signals?

<p>To limit the addressable memory space implemented (A)</p> Signup and view all the answers

How many address lines are needed to address each internal memory cell in the 128x8 memory chips example?

<p>$7$ lines (B)</p> Signup and view all the answers

What do X's represent in Partial Address Decoding?

<p>Don't care values (B)</p> Signup and view all the answers

How are unused address lines filled in Partial Address Decoding?

<p>With X's (don't cares) (B)</p> Signup and view all the answers

What is the purpose of Partial Address Decoding?

<p>To identify each memory location with multiple addresses (C)</p> Signup and view all the answers

In Partial Address Decoding, what happens when an address line is marked with X (don't care)?

<p>It signifies all possible values (1 or 0) (D)</p> Signup and view all the answers

What is the significance of 'don't cares' in memory addressing?

<p>They simplify the addressing process (B)</p> Signup and view all the answers

Why are 'don't cares' used in Partial Address Decoding?

<p>To simplify the addressing logic (B)</p> Signup and view all the answers

Flashcards

Memory Address Range

The set of possible memory locations a microprocessor can access.

RAM

Random Access Memory; commonly used to store programs and data.

EPROM

Erasable Programmable Read-Only Memory.

Interface (Microprocessor)

The communication path between two components.

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Decoding Circuit (Microprocessor)

Selects the correct memory chip or I/O device.

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Matching Memory/Microprocessor Signals

Ensuring proper communication between memory and microprocessor.

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Address Decoding

Generates chip select signals to select a specific memory or I/O device.

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Address Decoding Strategy

A method to ensure only one component is selected.

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Address Decoding and Device Selection

Address decoding generates enables selection to specific devices.

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Non-Homogenous Memory

Different memory portions (RAM, ROM, I/O) have distinct roles in the memory map.

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Unique Component Access

Ensuring only one component is accessed for a specific address.

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Addressable Space (Maximum)

The total number of memory locations that can be addressed.

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RAM Before ROM

RAM chips in the memory map are placed before ROM chips.

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RAM Chip Size

The amount of memory each RAM chip holds.

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Memory Map Starting Point

The initial address where the memory map begins.

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Hexadecimal

Number System using base-16.

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Address Bus Splitting

Division of address lines for chip select and internal addressing.

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Address Lines and Chips Needed

Calculating the required number of chips with given size and address lines.

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Lines to Select Each Chip

Number of address lines required to select a single chip.

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Full Address Decoding

Utilizing all address lines for precise chip selection.

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Partial Address Decoding

Using a subset of address lines to address memory.

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Partial Address Decoding Chip Select

Limiting addressable memory space through chip selection.

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Internal Memory Cell Address Lines

Address lines required to select a single internal memory cell.

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Don't Cares (X)

Address lines that can be either 0 or 1 (irrelevant).

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Don't Cares in Partial Address Decoding

Using X's in partial decoding to simplify logic.

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Don't Care Purpose

Simplification of logic in memory addressing.

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Partial Address Decoding Significance

Identifying each memory location with multiple addresses.

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