logic

bus

a group of wire used as a common word path by several registers

level clocking

changing output state of a flip-flop on the positive or negative level of clock pulse

edge triggering

changing the output state of a flip-flop on rising or falling edge of a clock pulse

combinational circuit

consist of logic gates whose outputs are determined directly from the combinational inputs without regard to previous inputs

toogle

going to switch to the opposite state

de-multiplexer

is a circuit that receives information in a single line and output it in one of the 2^n possible outputs. the selection of output line is controlled by bit values of N select lines

parallel adder

is a combinational circuit that adds two words of information

full adder

is a combinational circuit used for adding three bits, the outputs are sum and carry

full subtractor

is a combinational circuit used for subtracting three bits, the outputs are sum and carry

encoder

is a device with 2^n inputs and n outputs, only one input can be excuted at any one time. It generates on its output line a code corresponding to the input that was excited

decoder

is a device with n inputs and 2^n outputs, used in conjunction with truth table.

synchronous

is a type of sequential circuit, is a system whose behavior can be defined from the knowledge of its signal at discrete instant of time.

asynchronous

is a type of sequential circuit, is a system whose behavior depends upon the order in which it's input signal change and can be at any instant of time

flip-flop

it is a bistable capable of storing one bit of information. also known as bistable multi-vibrator

binary adder

it is a logic circuit that add two binary number

half adder

it is a logic circuit that adds two bits, the outputs are sum and carry

binary subtractor

it is a logic circuit that subtract two binary numbers

half subtractor

it is a logic circuit that subtract two bits, the outputs are sum and carry

sequential Logic

it is a type of digital logic that have memory whose output depends on current contents of the input and the current contents of the memory

combinational Logic

it is a type of digital logic that have no memory. The same inputs always produce the same output.

memory cell

it is the basic unit of memory, it can store one bit of information. It can be a core memory of a flip-flop

timing diagram

shows how input signal interact to produce output signal

contact bounce

the making and breaking of contacts for a few milliseconds after a switch closes

hold time

the minimum amount of time the input signals must be held constant after the clock edge has struct

set-up time

the minimum amount of time the inputs to a flipflop must be present before the clock edge arrives

multiplexer

this is just a reverse of 2^n input there will be only output line here, which input line proceeds to output line on a bit combination n select lines, on a single n control lines called select line will determined which input line will be selected