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 .
Why are Both SRAMs and DRAMs are volatile memories?
because they will lose stored data when dc power is removed.
Why are Both SRAMs and DRAMs are volatile memories?
because they will lose stored data when dc power is removed.
Why are Both SRAMs and DRAMs are volatile memories?
because they will lose stored data when dc power is removed.
What are the types of SRAM?
Asynchronous SRAM (ASRAM) Synchrounous Burst SRAM ( SB SRAM)
What are the types of DRAM?
FAST PAGE MODE DRAM (FPM DRAM)
EXTENDED DATA OUT DRAM (EDO DRAM)
BURST EDO DRAM (BEDO DRAM)
SYNCHOROUNOUS DRAM (SDRAM)
Why PROM is used primarily as an addressable memory and not as a logic device?
Because of limitations imposed by fixed AND gates
Why the PLA is also called FPLA (Field programmable logic array)?
Because of the user in the field, not the manufacturer, programs it.
What is the most common one-time programmable logic device?
PLA
What are the difference between GAL and PLA?
- GAL is reprogrammable
2. GAL has programmable output configurations
