Combinational circuits and systems produce an output based on input variables only. Sequential circuits use current input variables and previous input variables by storing the information and putting back into the circuit on the next clock (activation) cycle.
A theoretical view of how sequential circuits are made up from combinational logic and some storage elements. There are two types of input to the combinational logic; External inputs which come from outside the circuit design and are not controlled by the circuit; Internal inputs which a function of a previous output states are The internal inputs and outputs are refered to as "secondaries" in the course notes. Secondary inputs are state variables produced by the storage elements, where as secondary outputs are excitations for the storage elements.
Two Main Types of Sequential Circuits
There are two types of sequential circuit, synchronous and asynchronous. Synchronous types use pulsed or level inputs and a clock input to drive the circuit (with restrictions on pulse width and circuit propagation).
Asynchronous sequential circuits do not use a clock signal as synchronous circuits do. Instead the circuit is driven by the pulses of the inputs. You will not need to know anymore about asynchronous circuits for this course.
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A theoretical view of how sequential circuits are made up from combinational logic and some storage elements. There are two types of input to the combinational logic; External inputs which come from outside the circuit design and are not controlled by the circuit; Internal inputs which a function of a previous output states are The internal inputs and outputs are refered to as "secondaries" in the course notes. Secondary inputs are state variables produced by the storage elements, where as secondary outputs are excitations for the storage elements.
Two Main Types of Sequential Circuits
There are two types of sequential circuit, synchronous and asynchronous. Synchronous types use pulsed or level inputs and a clock input to drive the circuit (with restrictions on pulse width and circuit propagation).
Asynchronous sequential circuits do not use a clock signal as synchronous circuits do. Instead the circuit is driven by the pulses of the inputs. You will not need to know anymore about asynchronous circuits for this course.
To get full Document Click here