Chapter: Digital Electronics : Synchronous and Asynchronous Sequential Circuits

Analysis With JK Flip-Flops

The next state values of a sequential circuit that uses JK or T flip-flops can be derived

ANALYSIS WITH JK FLIP-FLOPS

The next state values of a sequential circuit that uses JK or T flip-flops can be derived

from:

A) the characteristic table, or

B) the characteristic equation.

· Determine the flip-flop input equations in terms of the present state and input variables.

· List the binary values of each equation.

· Use the flip-flop characteristic table to find the next state values in the state table.

As an example consider the following circuit:

The circuit can be specified by the flip-flop input equations:

JA = B KA = BX’

JB = X’ KB = A’X + AX’

The state table is:

The next state of each flip-flop is determined from the corresponding J and K inputs and the characteristic table of the JK flip-flop listed below:

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Digital Electronics : Synchronous and Asynchronous Sequential Circuits : Analysis With JK Flip-Flops |