Chapter 5.3 Flashcards
BITS
The smallest unit of binary data.
BYTE
Unit of 8 bits or multiplies of 8 bit units
Nibbles
A byte split into two 4 bit units
Word
Complete unit of information.
ADDRESS
The location of a unit in a memory array. The
address of a byte is specified only by row. The address of
a bit is specified by row and column.
CAPACITY:
It is the total number of data units that can be stored.
WRITE
The write operation puts data into a specified address in the memory.
READ
The read operation takes data out of a specified address in the memory.
ADDRESSING
The addressing operation which is part of both read and write ,selects the specified memory address.
Data Bus:
Data units go into memory during a write operation and come out of the memory during a read operation on a set of lines called the data bus. The data bus is bidirectional
ADDRESS BUS:
For a write or read operation ,an address is selected by placing a binary code representing the desired address on a set of lines called address lines.
The number of lines in the address bus depends on …
the addressing capacity.
RAM:
(RANDOM ACCESS MEMORY) : A type of memory in which all addresses are accessible in an equal amount of time and can be selected in any order for a read or write operation .All RAM’S have both read and write capability.
ROM
(READ ONLY MEMORY): A type of memory where data can be stored permanently or semi permanently .Data can be read form a ROM ,but there is no write operation as in RAM. The ROM is a random access memory
What are the types of Ram?
static RAM (SRAM) and dynamic RAM(DRAM) .
► SRAMs use flip flops as storage elements and can therefore
store data indefinitely as long as dc power is applied
► DRAMs use capacitors as storage elements and can retain
data very long without the capacitors being recharged by a
process called refreshing .
