Digital Logic Circuit State
Digital logic circuits can be divided into two types: combinational logic, whose output signals are dependent only on its present input signals, and sequential logic, whose outputs are a function of both the current inputs and the past history of inputs. In sequential logic, information from past inputs is stored in electronic memory elements, such as flip-flops and latches. The stored contents of these memory elements, at a given point in time, is collectively referred to as the circuit's "state". It represents all the distilled information about the past that the circuit has access to.
For example, the state of a microprocessor (computer chip) is the contents of all the memory elements; accumulators, storage registers, data caches, and flags, in the processor. When computers such as laptops go into a "hibernation" mode to save energy by shutting down the processor, the state of the processor is stored on the computer's disk, so it can be restored when the computer comes out of hibernation, and the processor can take up operations where it left off.
Read more about this topic: State (computer Science)
Famous quotes containing the words logic, circuit and/or state:
““... We need the interruption of the night
To ease attention off when overtight,
To break our logic in too long a flight,
And ask us if our premises are right.””
—Robert Frost (1874–1963)
“Within the circuit of this plodding life
There enter moments of an azure hue,
Untarnished fair as is the violet
Or anemone, when the spring strews them
By some meandering rivulet, which make
The best philosophy untrue that aims
But to console man for his grievances.
I have remembered when the winter came,”
—Henry David Thoreau (1817–1862)
“Most of the folktales dealing with the Indians are lurid and romantic. The story of the Indian lovers who were refused permission to wed and committed suicide is common to many places. Local residents point out cliffs where Indian maidens leaped to their death until it would seem that the first duty of all Indian girls was to jump off cliffs.”
—For the State of Iowa, U.S. public relief program (1935-1943)