M3S2 Flashcards
consists of electronic components that store
instructions waiting to be executed by the processor,
data needed by those instructions, and the results of
processing the data
memory
memory stores three basic categories of items
The operating
system and other
system software
Application
programs
Data being
processed and the
resulting
information
Each location in memory has an
address
Memory size is measured in
kilobytes (KB or K),
megabytes (MB), gigabytes (GB), or terabytes (TB)
The system unit contains two types of memory:
Volatile memory
Nonvolatile memory
Loses its contents when
power is turned off
volatile memory
example of volatile memory
ram
Does not lose contents
when power is removed
Nonvolatile memory
examples of Nonvolatile memory
ROM,
flash memory, and
CMOS
Three basic types of RAM chips exist:
Dynamic RAM
(DRAM)
Static RAM (SRAM)
Magnetoresistive
RAM (MRAM)
is a type of random-access memory that stores each bit of data in
a separate capacitor within an integrated circuit.
Dynamic RAM
can
be either charged or discharged
capacitor
has three different states.
Static RAM
- standby
- reading
- writing
the circuit is idle
standby
the data has been requested
reading
updating the
contents
writing
data in MRAM is not stored as electric charge or current flows, but
by
magnetic storage elements.
Dynamic RAM
- SDRAM
- DDR SDRAM
- DDR2 SDRAM
- DDR3 SDRAM
memory transfer data on both the rising and falling edges of the clock
signal
• DDR SDRAM (Double Data Rate Synchronous Dynamic RAM)
Singe Data rate RAM
• SDRAM
• DDR SDRAM
(Double Data Rate Synchronous Dynamic RAM)
8.5 GT/s; “dual channel mode”; memory installed in pairs
DDR2 SDRAM
Operates at lower voltages; consuming less power
DDR3 SDRAM
• 12.8 GT/s; dual and triple channel modes
• DDR3 SDRAM
RAM chips usually reside
on a what and are inserted into a what
memory module
memory slot
The amount of RAM necessary in a computer often
depends on the
types of software you plan to use
speeds the processes of the computer
because it stores frequently used instructions and
data
Memory cache
refers to memory chips storing
permanent data and
instructions
Read-only memory (ROM)
Read-only memory (ROM)
example
• Firmware
can be erased electronically and
rewritten
Flash memory
technology provides high speeds and
consumes little power
CMOS
a non-volatile storage
device which stores digitally encoded
data on rapidly rotating platters with
magnetic surfaces.
hard disk drive
refers to a device distinct from
its medium.
drive
an optical disc storage
media format
DVD,
DVDs are
of the same dimensions as
compact discs (CDs) but
store
more than six times as much data.
an Its main uses are for
storing PlayStation 3 games, highdefinition video and data storage with
up to 50GB per disc. optical disc storage
medium to supersede the standard
DVD format.
Blu-ray Disc
onsists of a NAND-type flash memory data storage device integrated with a USB (Universal Serial Bus) interface.
USB flash drive
typically removable and rewritable,
USB flash drives
s a
solid-state electronic flash memory data
storage device capable of storing digital
contents.
memory card or flash memory card
These are mainly used with digital cameras, handheld and Mobile computers, mobile phones, music players, digital cinematography cameras, video game consoles, and other electronics.
memory card or flash memory card
They offer
high re-record-ability, power-free storage,
small form factor, and rugged
environmental specifications.
memory card or flash memory card
