Chapter 4_Enum_The Memory System and Hierarchy

location,

capacity,

unit of transfer,

access method,

performance,

physical type,

physical characteristics,

organization

key characteristics of computer memory systems (8)

internal,

external

location (2)

Sequential access,

Direct access,

Random access,

Associative

access method (4)

access time,

cycle time,

transfer rate

performance (3)

semiconductor,

magnetic,

optical,

magneto-optical

physical type (4)

volatile/nonvolatile,

erasable/nonerasable

physical characteristics (2)

memory modules

organization (1)

Faster access time, greater cost per bit,

Greater capacity, smaller cost per bit,

Greater capacity, slower access time

The Memory Hierarchy (3)

Decreasing cost per bit,

Increasing capacity,

Increasing access time,

Decreasing frequency of access of the memory by the processor

As one goes down the hierarchy, the following occur (4)

Dynamic RAM (DRAM),

Static RAM (SRAM)

traditional forms of RAM (2)

Programmable ROM (PROM),

Read-Mostly Memory,

Erasable Programmable Read-Only Memory (EPROM),

Electrically Erasable Programmable Read-Only Memory (EEPROM),

Flash Memory

Types of ROM (5)

NOR Flash Memory,

NAND Flash Memory

Distinctive Types of Flash Memory (2)