How do I write FSM code in Verilog?

Basically a FSM consists of combinational, sequential and output logic. Combinational logic is used to decide the next state of the FSM, sequential logic is used to store the current state of the FSM. The output logic is a mixture of both combo and seq logic as shown in the figure below.

How do you write a sequence detector in Verilog?

Here below verilog code for 6-Bit Sequence Detector “101101” is given. This code is implemented using FSM. FSM for this Sequence Detector is given in this image. In this Sequence Detector, it will detect “101101” and it will give output as ‘1’.

What is sequence detector in Verilog?

A very common example of an FSM is that of a sequence detector where the hardware design is expected to detect when a fixed pattern is seen in a stream of binary bits that are input to it.

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). Sequence detector is of two types: Overlapping.

What is Verilog code?

Verilog is a Hardware Description Language; a textual format for describing electronic circuits and systems. Applied to electronic design, Verilog is intended to be used for verification through simulation, for timing analysis, for test analysis (testability analysis and fault grading) and for logic synthesis.

How do you write state code in Verilog?

How to Code a State Machine in Verilog

1. Stepper motor controller state diagram.
2. This block of code creates the state variables.
3. This block of code creates the state registers that hold the next_state and present_state variables.
4. This is the first chunk of the state logic.
5. This is the second chunk of the next state logic.

What is FSM in Verilog?

Finite State Machines (FSM) are sequential circuit used in many digital systems to control the behavior of systems and dataflow paths. Examples of FSM include control units and sequencers. This lab introduces the concept of two types of FSMs, Mealy and Moore, and the modeling styles to develop such machines.

How is FIFO implemented in Verilog?

To implement FIFO in verilog imagine the memory components to be arranged in a circular queue fashion with two pointers; write and read. The write pointer points to the start of the circle whereas the read pointer points to the end of the circle.

Where is sequence detector used?

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 ARE sequence detectors for?

Binary sequences are inserted at the beginning (or end) of a data frame or subframe emanating from a digital data processor of a spacecraft. Sequence detectors are used in the decoding equipment on the ground to provide “flags” which indicate the beginning (or end) of a data block (e.g., a TV frame).

Is Verilog a RTL?

Verilog modules that conform to a synthesizable coding style, known as RTL (register-transfer level), can be physically realized by synthesis software.

How do I code in Verilog?

1. Introduction.
2. Data Types.
3. Building Blocks. Verilog assign statements. Verilog assign examples. Verilog always block. Combo Logic with always. Sequential Logic with always. Verilog initial block.
4. Behavioral modeling. Verilog for Loop. Verilog case Statement.
5. Gate/Switch modeling.
6. Simulation.
7. System Tasks and Functions.
8. Code Examples.

What is Verilog code for Moore FSM sequence detector?

This Verilog project is to present a full Verilog code for Sequence Detector using 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.

How to write Verilog code for 1001 sequence detector?

As moore machine is used mostly in all practical designs the verilog code for 1001 sequence detector fsm is written in moore fsm logic. 1001 Sequence Detector State Diagram is given below. The verilog code for overlapping moore sequence detector is given below. If you have any query/suggestion please feel free to comment below the post.

How does the FSM of a sequence detector work?

The state diagram of the Moore FSM for the sequence detector is shown in the following figure. It is noted that the Moore FSM output depends on only the current state of the FSM. The state diagram of the Moor FSM for the sequence detector is as follows: The simulation waveform of the sequence detector shows exactly how a Moore FSM works.

When does the VHDL FSM sequence detector 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.