Answered: A directly mapped cache is…

A directly mapped cache is distinguished from an associative cache by its inability to arbitrarily couple data elements.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.

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Associative caches may freely associate data items, unlike directly mapped caches.
When data is stored in a cache in an entirely associative fashion, how does it work?
Associative caches and direct-mapped caches are distinct.
A message slot is a cache line that contains status flags and the message itself. The state can be empty or ready, and communication occurs through a single cache line. Both the sender and the receiver write the message to the cache line. The receiver updates the state from empty to ready, then polls the cache line in a loop waiting for the sender to send a message. The sender waits in a tight loop until the receiver acknowledges the cache line, changes the state from ready to empty, and acknowledges receipt. Explain that the system uses a snooping cache coherence protocol and describe the cache-coherence transaction taking place on the coherence bus when a message transfer occurs.
It is important to differentiate between a cache that is completely associative and one that is directly mapped.
The ability to freely associate data items is the primary characteristic that distinguishes a fully associative cache from a directly mapped cache. This ability is the major distinction between the two types of caches.
Associative caches may freely associate data items, unlike directly mapped caches.
. Cache Write Policies In a cache system using a write-back policy, if a cache block is modified and marked as "dirty" but not yet updated in the main memory, and that block is selected for replacement, what action should be taken to ensure data integrity?
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A true associative cache differs from a directly mapped cache in that it allows users to arbitrarily associate data elements.
For a direct-mapped cache with 64KİB data, 8-word blocks, and 32-bit addresses, answer the following questions: a) What is the number of blocks/lines in the cache? b) Identify the bits in the 32-bit address that are used as index bits? c) Identify the bits in the 32-bit address that are used as tag bits? d) What is the total number of bits in this cache (including tag field and valid field)? e) Identify the block number in the cache to which the following 32-bit memory address maps: Ox00003Z00 (Hexadecimal notation) where Z is the least significant digit in your student ID (written as a decimal number)
Compare an associative cache to a directly mapped one.