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Chapter 6 Synchronous Sequential Circuits

Chapter 6 Synchronous Sequential Circuits In a combinational circuit, the values of the outputs are determined solely by the present values of its a Sequential circuit, the values of the outputs depend on the past behavior of the circuit, as well as the present values of its Sequential circuit has states, which in conjunction with the present values of inputs determine its Circuits can be: ! Synchronous where flip-flops are used to implement the states, and a clock signal is used to control the operation ! Asynchronous where no clock is used Figure The general form of a Synchronous Sequential circuit Flip-flopsClock Q W Z Combinational circuit If the outputs depend only on the present state, the circuit is said to be of Moore the outputs depend on both the present state and the present values of the inputs, the circuit is said to be of Mealy Sequences of input and output : t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10w : 0 1 0 1 1 0 1 1 1 0 1 z : 0 0 0 0 0 1 0 0 1 1 0 Figure State diagram of a simple Sequential z 1 = Reset B z 0 = A z 0 = w 0 = w 1 = w 1 = w 0 = w 0 = w 1 = Figure Sta

Verilog code for the Mealy machine of Figure 6.23. Please see “portrait orientation” PowerPoint file for Chapter 6. Figure 6.37. Simulation results for the Mealy machine. Figure 6.38. Potential problem with asynchronous inputs to a Mealy FSM. Figure 6.39. Block diagram for the serial adder. Sum = A + B

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