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What is sequence Detection?
A sequence detector is a sequential state machine that takes an input string of bits and generates an output 1 whenever the target sequence has been detected. In a Mealy machine, output depends on the present state and the external input (x). Sequence detector is of two types: Overlapping.
Is testing sequential logic more difficult than testing combinational logic?
PROBLEM AREAS There are several reasons why test pattern generation for sequential circuits is more difficult than for combinational circuits. There is a need to drive the circuit in a known state before applying the test pattern that will sensitize the fault to a primary output.
What is the output of a sequence detector?
A sequence detector accepts as input a string of bits: either 0 or 1. Its output goes to 1 when a target sequence has been detected. There are two basic types:overlapandnon-overlap.
How are sequence detectors used in digital locks?
Sequence detectors are sequential circuits that detect a predefined pattern on their data input. You can consider these types of circuits as the basic concept of a digital lock. In order to build the sequence detector in this lesson, we used a Moore machine, which is a state machine where the output is not a direct function of the input.
When does a sequence detector turn back to 1?
If you follow the input and output sequences, you can see that only when the last four bits of the input sequence are 0111 does the output turn to 1 during one clock cycle. It then turns back to 0. The sequence detectors that we cover in this lesson do not reset their states after each detection.
How to Prelab assignment for a sequence detector?
Sequence detector 4. Prelab Assignment For the sequence detector: Obtain the state diagram of the sequence detector. Derive the transition and output tables. Derive the excitation and output functions. Draw the circuit diagram of the sequence detector.