….-ported memories can access several addresses simultaneously

Each memory location has unique address

Memory address usually starts at

An address is represented by …. Integer

A byte addressable memory: each word has its own address

most current machines are …. addressable even they have 32 bit or larger words

Volatile, it loses its data when the power is turned off

Can be used only as temporary storage

is used in embedded systems or any systems where the programming doesn’t need to change

are also used in calculators and peripheral devices such as laser printers

Must be provided with constant power supply. If the power is interrupted, then the data are lost

Nonvolatile, it retains its data indefinitely, even without a power source

is essentially EEPROM with data can be written or erased in blocks, removing one byte at a time limitation

no special tools are required for erasure and you can erase only portions of the chip, one byte at a time

can be programmed by the user with the appropriate equipment. Once programmed, the data and instructions can’t be changed

is programable with the added advantage of being reprogrammable but to be reprogramed, the entire chip must first be erased using special tools

The presence or absence of charge in a capacitor is interpreted as a binary 1 or 0

DRAM stores data as a charge on a capacitor

data values are transferred from the capacitor to the bit line

data values are transferred from the bit line to the capacitor

When the address line is selected, the charge stored on the capacitor is fed out onto a bit line