# What is sequence detector in FSM?

## What is sequence detector in FSM?

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).

**What is overlapping condition in sequence detectors?**

Overlapping Sequence Detector: In this type of sequence detector allows overlap, the final bits of one sequence can be the start of another sequence. For example, will be an 1101 sequence detector. It raises an output of 1 when the last 4 binary bits received are 1101.

### What is mealy FSM?

A Mealy Machine is an FSM whose output depends on the present state as well as the present input. It can be described by a 6 tuple (Q, ∑, O, δ, X, q0) where − Q is a finite set of states. ∑ is a finite set of symbols called the input alphabet.

**What is ASM chart?**

ASM chart. An ASM chart consists of an interconnection of four types of basic elements: state name, state box, condition checks, and conditional outputs. An ASM state, represented as a rectangle, corresponds to one state of a regular state diagram or finite state machine.

#### What are sequence detector circuits how it works?

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: overlap and non-overlap. In a sequence detector that allows overlap, the final bits of one sequence can be the start of another sequence.

**What is mealy Moore machine?**

A Mealy Machine changes its output on the basis of its present state and current input. A Moore Machine’s output depends only on the current state. It does not depend on the current input.

## What is FSM and ASM?

The condition expression contains one or more inputs to the FSM (Finite State Machine). An ASM condition check, indicated by a diamond with one input and two outputs (for true and false), is used to conditionally transfer between two State Boxes, to another Decision Box, or to a Conditional Output Box.

**What is FSM in digital electronics?**

The Finite State Machine is an abstract mathematical model of a sequential logic function. It has finite inputs, outputs and number of states. FSMs are implemented in real-life circuits through the use of Flip Flops. The implementation procedure needs a specific order of steps (algorithm), in order to be carried out.

### How do you create a sequence generator?

Sequence Generator using Counters

- First, count the number of zeros and ones in the given sequence.
- Select the high number of the two. And let this number will be ‘N’.
- The no.
- For instance, the given sequence is 1011011, where the number of ones is 5 and the number of zeros is two.

**What is the state diagram of the Moore FSM sequence detector?**

The state diagram of the Moor FSM for the sequence detector is as follows: Verilog code for the Moore FSM Sequence Detector is designed based on the state diagram and block diagram of the Moore FSM: The simulation waveform of the sequence detector shows exactly how a Moore FSM works.

#### How many possible scenarios are there for sequence detectors 1101?

Those are all the four possible scenarios for sequence detectors 1101. Leave me a comment below if you have any questions.

**When does the VHDL Moore FSM sequence detector output go high?**

As shown in the simulation waveform of the VHDL Moore FSM sequence detector, the detector output only goes high when the sequence “1001” is detected. Verilog code for Moore FSM Sequence Detector: here.

## Is there a Verilog testbench for the Moore FSM?

A Verilog Testbench for the Moore FSM sequence detector is also provided for simulation. The Moore FSM keeps detecting a binary sequence from a digital input and the output of the FSM goes high only when a “1011” sequence is detected. The state diagram of the Moore FSM for the sequence detector is shown in the following figure.