Synchronous Circuit Diagram Logic. The circuit is synchronous because the state feedback loop is broken by an s bit wide d flip flop where s is the number of state bits. For example an asynchronous logic circuit that is waiting to respond to a positive 0 to 1 logic transition would erroneously react in our timing diagram of figure 3.
Synchronous sequential circuit signals affect the storage elements at only discrete instants of time synchronization by a timing device clock generator periodic train of clock pulses. Therefore synchronous circuits can be divided into clocked sequential circuits and uncklocked or pulsed sequential circuits. Logic diagram construction of a synchronous sequential circuit sequential circuit design steps the design of sequential circuit starts with verbal specifications of the problem see figure 1.
A 4 bit synchronous up counter start to count from 0 0000 in binary and increment or count upwards to 15 1111 in binary and then start new counting cycle by getting reset.
The circuit is controlled by the synchronising clock signal and the memory is realised with edge triggered flip flops changes taking place on either the leading or trailing edge of a clock pulse. Therefore synchronous circuits can be divided into clocked sequential circuits and uncklocked or pulsed sequential circuits. Synchronous up counter in the above image the basic synchronous counter design is shown which is synchronous up counter. Clock clk flip flop storage elements used in clocked sequential circuits capable of storing one bit of information figure 52.