### Install Pyverilog

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Install Pyverilog using the setup.py script after ensuring all requirements are met.

```bash
python3 setup.py install
```

--------------------------------

### Install Graphviz

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Install Graphviz, which is required for graph visualization by dataflow/graphgen.py and controlflow/controlflow_analyzer.py. Pygraphviz is also recommended.

```bash
sudo apt install graphviz
```

--------------------------------

### Install Pygraphviz

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Install Pygraphviz, which is required for graph visualization by dataflow/graphgen.py and controlflow/controlflow_analyzer.py. Graphviz is also a prerequisite.

```bash
pip3 install pygraphviz
```

--------------------------------

### Install pytest and pytest-pythonpath

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Install pytest and pytest-pythonpath for optional testing of Pyverilog. These are recommended for verifying experimental features.

```bash
pip3 install pytest pytest-pythonpath
```

--------------------------------

### Install Jinja2 and PLY

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Install Jinja2 and PLY, which are required for Pyverilog. Ensure Python 3.7 or later is used.

```bash
pip3 install jinja2 ply
```

--------------------------------

### Run Pyverilog Syntax Analysis

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Execute the example parser script to perform syntax analysis on a Verilog file. This command initiates the parsing process and displays the analyzed structure.

```bash
python3 pyverilog/examples/example_parser.py test.v
```

--------------------------------

### Install Pyverilog and Dependencies

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Installs Icarus Verilog, Python dependencies (jinja2, ply), and Pyverilog itself. Source installation and optional visualization dependencies are also covered.

```bash
sudo apt install iverilog

pip3 install jinja2 ply

pip3 install pyverilog

python3 setup.py install

sudo apt install graphviz
pip3 install pygraphviz
```

--------------------------------

### Verilog Example Module

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

A sample Verilog HDL module named 'top' that includes clock, reset, enable, input value, and output led signals. It demonstrates internal counting and state management.

```verilog
module top
  (
   input CLK, 
   input RST,
   input enable,
   input [31:0] value,
   output [7:0] led
  );
  reg [31:0] count;
  reg [7:0] state;
  assign led = count[23:16];
  always @(posedge CLK) begin
    if(RST) begin
      count <= 0;
      state <= 0;
    end else begin
      if(state == 0) begin
        if(enable) state <= 1;
      end else if(state == 1) begin
        state <= 2;
      end else if(state == 2) begin
        count <= count + value;
        state <= 0;
      end
    end
  end
endmodule

```

--------------------------------

### Install Icarus Verilog

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Install Icarus Verilog, a requirement for Pyverilog. Ensure version 10.1 or later is used.

```bash
sudo apt install iverilog
```

--------------------------------

### Run Pyverilog Dataflow Analysis

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Execute the example dataflow analyzer script to perform dataflow analysis on a Verilog module. This command traces signal definitions and assignments within the specified module.

```bash
python3 pyverilog/examples/example_dataflow_analyzer.py -t top test.v
```

--------------------------------

### Generate Verilog from AST using Python

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Use this script to programmatically create Verilog modules. It requires Pyverilog to be installed. The script defines a module with parameters, inputs, outputs, registers, and procedural logic.

```Python
from __future__ import absolute_import
from __future__ import print_function
import sys
import os
import pyverilog.vparser.ast as vast
from pyverilog.ast_code_generator.codegen import ASTCodeGenerator

def main():
    datawid = vast.Parameter( 'DATAWID', vast.Rvalue(vast.IntConst('32')) )
    params = vast.Paramlist( [datawid] )
    clk = vast.Ioport( vast.Input('CLK') )
    rst = vast.Ioport( vast.Input('RST') )
    width = vast.Width( vast.IntConst('7'), vast.IntConst('0') )
    led = vast.Ioport( vast.Output('led', width=width) )
    ports = vast.Portlist( [clk, rst, led] )

    width = vast.Width( vast.Minus(vast.Identifier('DATAWID'), vast.IntConst('1')), vast.IntConst('0') )
    count = vast.Reg('count', width=width)

    assign = vast.Assign(
        vast.Lvalue(vast.Identifier('led')),
        vast.Rvalue(
            vast.Partselect(
                vast.Identifier('count'), # count
                vast.Minus(vast.Identifier('DATAWID'), vast.IntConst('1')), # [DATAWID-1:
                vast.Minus(vast.Identifier('DATAWID'), vast.IntConst('8')))))

    sens = vast.Sens(vast.Identifier('CLK'), type='posedge')
    senslist = vast.SensList([ sens ])

    assign_count_true = vast.NonblockingSubstitution(
        vast.Lvalue(vast.Identifier('count')),
        vast.Rvalue(vast.IntConst('0')))
    if0_true = vast.Block([ assign_count_true ])

    # count + 1
    count_plus_1 = vast.Plus(vast.Identifier('count'), vast.IntConst('1'))
    assign_count_false = vast.NonblockingSubstitution(
        vast.Lvalue(vast.Identifier('count')),
        vast.Rvalue(count_plus_1))
    if0_false = vast.Block([ assign_count_false ])

    if0 = vast.IfStatement(vast.Identifier('RST'), if0_true, if0_false)
    statement = vast.Block([ if0 ])

    always = vast.Always(senslist, statement)

    items = []
    items.append(count)
    items.append(assign)
    items.append(always)

    ast = vast.ModuleDef("top", params, ports, items)
    
    codegen = ASTCodeGenerator()
    rslt = codegen.visit(ast)
    print(rslt)

if __name__ == '__main__':
    main()

```

--------------------------------

### Reference Common AST Node Types

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Provides examples of common AST node classes used for module structure, ports, signals, parameters, expressions, and operators.

```python
import pyverilog.vparser.ast as vast

# Module structure
module = vast.ModuleDef(name, paramlist, portlist, items)
params = vast.Paramlist([param1, param2])
ports = vast.Portlist([port1, port2])

# Ports and signals
input_port = vast.Input('clk')
output_port = vast.Output('data', width=vast.Width(vast.IntConst('7'), vast.IntConst('0')))
inout_port = vast.Inout('bidir')
reg_signal = vast.Reg('counter', width=width)
wire_signal = vast.Wire('connection')

# Port wrapper for module definition
ioport = vast.Ioport(vast.Input('signal_name'))

# Parameters
param = vast.Parameter('WIDTH', vast.Rvalue(vast.IntConst('8')))
localparam = vast.Localparam('DEPTH', vast.Rvalue(vast.IntConst('16')))

# Expressions
identifier = vast.Identifier('signal_name')
intconst = vast.IntConst('32')
intconst_hex = vast.IntConst("8'hFF")
stringconst = vast.StringConst('hello')

# Operators
plus = vast.Plus(left, right)
minus = vast.Minus(left, right)
times = vast.Times(left, right)
divide = vast.Divide(left, right)
land = vast.Land(left, right)   # Logical AND (&&)
lor = vast.Lor(left, right)     # Logical OR (||)
eq = vast.Eq(left, right)       # Equality (==)
noteq = vast.NotEq(left, right) # Inequality (!=)

# Bit operations
partselect = vast.Partselect(var, msb, lsb)  # var[msb:lsb]
pointer = vast.Pointer(var, index)            # var[index]
concat = vast.Concat([sig1, sig2, sig3])      # {sig1, sig2, sig3}

# Assignments
assign = vast.Assign(lvalue, rvalue)  # Continuous assignment
blocking = vast.BlockingSubstitution(lvalue, rvalue)     # =
nonblocking = vast.NonblockingSubstitution(lvalue, rvalue)  # <=
```

--------------------------------

### Control Flow Analysis Output

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Example output from the control-flow analyzer, detailing FSM signals, condition list lengths, and inferred transition conditions.

```text
FSM signal: top.count, Condition list length: 4
FSM signal: top.state, Condition list length: 5
Condition: (Ulnot, Eq), Inferring transition condition
Condition: (Eq, top.enable), Inferring transition condition
Condition: (Ulnot, Ulnot, Eq), Inferring transition condition
# SIGNAL NAME: top.state
```

--------------------------------

### Generate Dataflow Graph

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Generates a graphical representation of the data flow for a specified module and signal. Requires Graphviz and Pygraphviz to be installed. Outputs an image file (e.g., out.png).

```bash
python3 pyverilog/examples/example_graphgen.py -t top -s top.led test.v
```

--------------------------------

### Instantiating Modules

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Create a module instance with port and parameter connections.

```python
instance = vast.Instance(module_name, instance_name, port_connections, param_connections)
```

--------------------------------

### Verilog Module Instantiation Template

Source: https://github.com/pyhdi/pyverilog/blob/develop/pyverilog/ast_code_generator/template/instancelist.txt

Template logic for rendering module parameters and instances. Requires a context containing parameterlist and instances variables.

```jinja2
{{ module }}
{%- if len_parameterlist > 0 %}
#({% for param in parameterlist %}
{{ param }}{%- if loop.index < len_parameterlist -%},
{%- endif -%}{% endfor %}
)
{%- endif %}
{%- for instance in instances %}
{{ instance }}{%- if loop.index < len_instances -%},
{%- endif -%}{%- endfor -%};
```

--------------------------------

### Preprocess and Lex Verilog Files

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Handles Verilog preprocessor directives like `include and `define, and dumps tokens for debugging.

```python
from pyverilog.vparser.preprocessor import preprocess
from pyverilog.vparser.lexer import dump_tokens

# Preprocess Verilog files (handle `include, `define, etc.)
preprocessed_text = preprocess(
    ['design.v'],
    include=['./include'],
    define=['DEBUG', 'WIDTH=16']
)

# Dump tokens for debugging
tokens = dump_tokens(preprocessed_text)
print(tokens)
```

--------------------------------

### parse()

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Parses Verilog HDL source files and generates an Abstract Syntax Tree (AST) representation.

```APIDOC
## parse(filenames, preprocess_include=None, preprocess_define=None)

### Description
Parses Verilog HDL source files and generates an Abstract Syntax Tree (AST) representation. The parser handles preprocessing directives, include files, and macro definitions.

### Parameters
#### Arguments
- **filenames** (list) - Required - List of Verilog source file paths.
- **preprocess_include** (list) - Optional - List of directories to search for include files.
- **preprocess_define** (list) - Optional - List of macro definitions.

### Response
- **ast** (object) - The generated Abstract Syntax Tree.
- **directives** (list) - List of directives found during parsing.
```

--------------------------------

### Constructing Verilog Control Structures

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Create if, case, and for loop statements using the vast module.

```python
if_stmt = vast.IfStatement(condition, true_branch, false_branch)
case_stmt = vast.CaseStatement(comp, [case1, case2])
case = vast.Case([condition], statement)
for_stmt = vast.ForStatement(init, cond, next_stmt, body)
```

--------------------------------

### Construct Verilog Modules Programmatically

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Builds a Verilog module using AST node classes and generates the corresponding Verilog code.

```python
import pyverilog.vparser.ast as vast
from pyverilog.ast_code_generator.codegen import ASTCodeGenerator

# Define module parameters
datawid = vast.Parameter('DATAWID', vast.Rvalue(vast.IntConst('32')))
params = vast.Paramlist([datawid])

# Define ports
clk = vast.Ioport(vast.Input('CLK'))
rst = vast.Ioport(vast.Input('RST'))
width = vast.Width(vast.IntConst('7'), vast.IntConst('0'))
led = vast.Ioport(vast.Output('led', width=width))
ports = vast.Portlist([clk, rst, led])

# Define internal signals
width = vast.Width(
    vast.Minus(vast.Identifier('DATAWID'), vast.IntConst('1')),
    vast.IntConst('0')
)
count = vast.Reg('count', width=width)

# Create continuous assignment: assign led = count[DATAWID-1:DATAWID-8]
assign = vast.Assign(
    vast.Lvalue(vast.Identifier('led')),
    vast.Rvalue(
        vast.Partselect(
            vast.Identifier('count'),
            vast.Minus(vast.Identifier('DATAWID'), vast.IntConst('1')),
            vast.Minus(vast.Identifier('DATAWID'), vast.IntConst('8'))
        )
    )
)

# Create always block: always @(posedge CLK)
sens = vast.Sens(vast.Identifier('CLK'), type='posedge')
senslist = vast.SensList([sens])

# Reset branch: count <= 0
assign_reset = vast.NonblockingSubstitution(
    vast.Lvalue(vast.Identifier('count')),
    vast.Rvalue(vast.IntConst('0'))
)
reset_block = vast.Block([assign_reset])

# Normal operation: count <= count + 1
count_plus_1 = vast.Plus(vast.Identifier('count'), vast.IntConst('1'))
assign_increment = vast.NonblockingSubstitution(
    vast.Lvalue(vast.Identifier('count')),
    vast.Rvalue(count_plus_1)
)
normal_block = vast.Block([assign_increment])

# If statement: if (RST) ... else ...
if_stmt = vast.IfStatement(vast.Identifier('RST'), reset_block, normal_block)
statement = vast.Block([if_stmt])

always = vast.Always(senslist, statement)

# Assemble module
items = [count, assign, always]
module = vast.ModuleDef("top", params, ports, items)

# Generate Verilog code
codegen = ASTCodeGenerator()
result = codegen.visit(module)
print(result)
```

--------------------------------

### Execute Python script to generate Verilog

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Run this command in the terminal in the same directory as the Python script to generate the Verilog HDL code.

```Shell
python3 test.py
```

--------------------------------

### Parse Verilog HDL to AST

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Parses Verilog HDL source files into an Abstract Syntax Tree (AST). Supports include paths and macro definitions for complex designs. The AST structure can be displayed and directives can be accessed.

```python
from pyverilog.vparser.parser import parse

# Parse a single Verilog file
ast, directives = parse(['design.v'])

# Parse with include paths and macro definitions
ast, directives = parse(
    ['top.v', 'submodule.v'],
    preprocess_include=['./include', './lib'],
    preprocess_define=['DEBUG=1', 'WIDTH=32']
)

# Display the AST structure
ast.show()

# Output:
# Source:  (at 1)
#   Description:  (at 1)
#     ModuleDef: top (at 1)
#       Paramlist:  (at 0)
#       Portlist:  (at 2)
#         Ioport:  (at 3)
#           Input: CLK, False (at 3)
#         Ioport:  (at 4)
#           Input: RST, False (at 4)
#       ...

# Access directives found during parsing
for lineno, directive in directives:
    print(f'Line {lineno}: {directive}')
```

--------------------------------

### System Call Template Generation

Source: https://github.com/pyhdi/pyverilog/blob/develop/pyverilog/ast_code_generator/template/systemcall.txt

Used to format system calls with variable arguments in Jinja2 templates. Requires len_args and args to be defined in the template context.

```jinja2
${{ syscall }}{% if len_args > 0 %}({% endif %}{% for arg in args %}{{ arg }}{% if loop.index < len_args %}, {% endif %}{% endfor %}{% if len_args > 0 %}){% endif %}
```

--------------------------------

### VerilogCodeParser for Detailed Parsing

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Provides a lower-level parser with separate preprocessing and parsing stages. Useful for more granular control over the parsing process. The AST can be traversed programmatically.

```python
from pyverilog.vparser.parser import VerilogCodeParser

# Create parser with configuration
codeparser = VerilogCodeParser(
    ['design.v'],
    preprocess_include=['./include'],
    preprocess_define=['SIMULATION']
)

# Parse and get AST
ast = codeparser.parse()
directives = codeparser.get_directives()

# The AST can be traversed programmatically
for definition in ast.description.definitions:
    if hasattr(definition, 'name'):
        print(f'Found module: {definition.name}')
```

--------------------------------

### Creating Code Blocks

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Group multiple statements into a single block.

```python
block = vast.Block([stmt1, stmt2, stmt3])
```

--------------------------------

### Verilog Module Jinja2 Template

Source: https://github.com/pyhdi/pyverilog/blob/develop/pyverilog/ast_code_generator/template/moduledef.txt

Use this template to dynamically generate Verilog module definitions. Ensure the variables modulename, paramlist, portlist, and items are provided in the rendering context.

```jinja2
module {{ modulename }}{% if paramlist != '' %} #
(
{{ paramlist }}
)
{%- endif %}
(
{{ portlist }}
);

{% for item in items %}{{ item }}
{% endfor %}
endmodule
```

--------------------------------

### Defining Always Blocks

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Define sensitivity lists and always blocks for sequential logic.

```python
sens = vast.Sens(vast.Identifier('clk'), type='posedge')
senslist = vast.SensList([sens])
always = vast.Always(senslist, statement)
```

--------------------------------

### Pyverilog Syntax Analysis Output

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

The output represents the abstract syntax tree (AST) of the Verilog code after syntax analysis. It details module definitions, ports, declarations, assignments, and procedural blocks.

```text
Source:  (at 1)
  Description:  (at 1)
    ModuleDef: top (at 1)
      Paramlist:  (at 0)
      Portlist:  (at 2)
        Ioport:  (at 3)
          Input: CLK, False (at 3)
        Ioport:  (at 4)
          Input: RST, False (at 4)
        Ioport:  (at 5)
          Input: enable, False (at 5)
        Ioport:  (at 6)
          Input: value, False (at 6)
            Width:  (at 6)
              IntConst: 31 (at 6)
              IntConst: 0 (at 6)
        Ioport:  (at 7)
          Output: led, False (at 7)
            Width:  (at 7)
              IntConst: 7 (at 7)
              IntConst: 0 (at 7)
      Decl:  (at 9)
        Reg: count, False (at 9)
          Width:  (at 9)
            IntConst: 31 (at 9)
            IntConst: 0 (at 9)
      Decl:  (at 10)
        Reg: state, False (at 10)
          Width:  (at 10)
            IntConst: 7 (at 10)
            IntConst: 0 (at 10)
      Assign:  (at 11)
        Lvalue:  (at 11)
          Identifier: led (at 11)
        Rvalue:  (at 11)
          Partselect:  (at 11)
            Identifier: count (at 11)
            IntConst: 23 (at 11)
            IntConst: 16 (at 11)
      Always:  (at 12)
        SensList:  (at 12)
          Sens: posedge (at 12)
            Identifier: CLK (at 12)
        Block: None (at 12)
          IfStatement:  (at 13)
            Identifier: RST (at 13)
            Block: None (at 13)
              NonblockingSubstitution:  (at 14)
                Lvalue:  (at 14)
                  Identifier: count (at 14)
                Rvalue:  (at 14)
                  IntConst: 0 (at 14)
              NonblockingSubstitution:  (at 15)
                Lvalue:  (at 15)
                  Identifier: state (at 15)
                Rvalue:  (at 15)
                  IntConst: 0 (at 15)
            Block: None (at 16)
              IfStatement:  (at 17)
                Eq:  (at 17)
                  Identifier: state (at 17)
                  IntConst: 0 (at 17)
                Block: None (at 17)
                  IfStatement:  (at 18)
                    Identifier: enable (at 18)
                    NonblockingSubstitution:  (at 18)
                      Lvalue:  (at 18)
                        Identifier: state (at 18)
                      Rvalue:  (at 18)
                        IntConst: 1 (at 18)
                IfStatement:  (at 19)
                  Eq:  (at 19)
                    Identifier: state (at 19)
                    IntConst: 1 (at 19)
                  Block: None (at 19)
                    NonblockingSubstitution:  (at 20)
                      Lvalue:  (at 20)
                        Identifier: state (at 20)
                      Rvalue:  (at 20)
                        IntConst: 2 (at 20)
                  IfStatement:  (at 21)
                    Eq:  (at 21)
                      Identifier: state (at 21)
                      IntConst: 2 (at 21)
                    Block: None (at 21)
                      NonblockingSubstitution:  (at 22)
                        Lvalue:  (at 22)
                          Identifier: count (at 22)
                        Rvalue:  (at 22)
                          Plus:  (at 22)
                            Identifier: count (at 22)
                            Identifier: value (at 22)
                      NonblockingSubstitution:  (at 23)
                        Lvalue:  (at 23)
                          Identifier: state (at 23)
                        Rvalue:  (at 23)
                          IntConst: 0 (at 23)
```

--------------------------------

### VerilogDataflowOptimizer

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Optimizes dataflow trees by resolving constants and simplifying expressions.

```APIDOC
## VerilogDataflowOptimizer(terms, binddict)

### Description
Optimizes dataflow trees by resolving constants and simplifying expressions, which is essential for control-flow analysis and graph generation.

### Parameters
- **terms** (dict) - Required - Signal definitions from the analyzer.
- **binddict** (dict) - Required - Binding dictionary from the analyzer.

### Methods
- **resolveConstant()** - Resolves constant values throughout the design.
```

--------------------------------

### Analyze Control Flow

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

Performs control-flow analysis on a Verilog file to identify state machine structures and transition conditions. Can optionally use Graphviz for visualization; append "--nograph" to disable.

```bash
python3 pyverilog/examples/example_controlflow_analyzer.py -t top test.v
```

--------------------------------

### Generate Dataflow Graphs with VerilogGraphGenerator

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Use VerilogGraphGenerator to create visual dataflow graphs of signal dependencies. This tool requires prior dataflow analysis and optimization. The graph generation can be customized with parameters like walk depth and signal targeting.

```python
from pyverilog.dataflow.dataflow_analyzer import VerilogDataflowAnalyzer
from pyverilog.dataflow.optimizer import VerilogDataflowOptimizer
from pyverilog.dataflow.graphgen import VerilogGraphGenerator

# Setup dataflow analysis
analyzer = VerilogDataflowAnalyzer(['design.v'], topmodule='top')
analyzer.generate()

terms = analyzer.getTerms()
binddict = analyzer.getBinddict()

optimizer = VerilogDataflowOptimizer(terms, binddict)
optimizer.resolveConstant()

resolved_terms = optimizer.getResolvedTerms()
resolved_binddict = optimizer.getResolvedBinddict()
constlist = optimizer.getConstlist()

# Create graph generator
graphgen = VerilogGraphGenerator(
    'top', terms, binddict,
    resolved_terms, resolved_binddict, constlist,
    'output.png'
)

# Generate graph for specific signals
graphgen.generate(
    'top.led',           # Target signal
    walk=True,           # Walk through continuous signals
    identical=False,     # Don't merge identical leaves
    step=2,              # Search depth
    reorder=True,        # Reorder tree for clarity
    delay=True           # Insert delay nodes for registers
)

# Draw and save the graph
graphgen.draw()
```

--------------------------------

### Trace Signal Dependencies with VerilogDataflowWalker

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Employ VerilogDataflowWalker to traverse dataflow trees and trace signal dependencies. This tool requires initial dataflow analysis and optimization. It provides a string representation of the dependency tree for a given signal.

```python
from pyverilog.dataflow.dataflow_analyzer import VerilogDataflowAnalyzer
from pyverilog.dataflow.optimizer import VerilogDataflowOptimizer
from pyverilog.dataflow.walker import VerilogDataflowWalker

# Setup analysis
analyzer = VerilogDataflowAnalyzer(['design.v'], topmodule='top')
analyzer.generate()

terms = analyzer.getTerms()
binddict = analyzer.getBinddict()

optimizer = VerilogDataflowOptimizer(terms, binddict)
optimizer.resolveConstant()

resolved_terms = optimizer.getResolvedTerms()
resolved_binddict = optimizer.getResolvedBinddict()
constlist = optimizer.getConstlist()

# Create walker
walker = VerilogDataflowWalker(
    'top', terms, binddict,
    resolved_terms, resolved_binddict, constlist
)

# Walk the binding tree for a specific signal
tree = walker.walkBind('top.led')
print(f'Signal: top.led')
print(tree.tostr())
# Output shows the complete dependency tree for the signal
```

--------------------------------

### Pyverilog Dataflow Analysis Output

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

The output details the directives, instances, terms (signals), and bind information derived from the dataflow analysis. It shows signal properties and their dependencies.

```text
Directive:
Instance:
(top, 'top')
Term:
(Term name:top.led type:{'Output'} msb:(IntConst 7) lsb:(IntConst 0))
(Term name:top.enable type:{'Input'} msb:(IntConst 0) lsb:(IntConst 0))
(Term name:top.CLK type:{'Input'} msb:(IntConst 0) lsb:(IntConst 0))
(Term name:top.count type:{'Reg'} msb:(IntConst 31) lsb:(IntConst 0))
(Term name:top.state type:{'Reg'} msb:(IntConst 7) lsb:(IntConst 0))
(Term name:top.RST type:{'Input'} msb:(IntConst 0) lsb:(IntConst 0))
(Term name:top.value type:{'Input'} msb:(IntConst 31) lsb:(IntConst 0))
Bind:
(Bind dest:top.count tree:(Branch Cond:(Terminal top.RST) True:(IntConst 0) False:(Branch Cond:(Operator Eq Next:(Terminal top.state),(IntConst 0)) False:(Branch Cond:(Operator Eq Next:(Terminal top.state),(IntConst 1)) False:(Branch Cond:(Operator Eq Next:(Terminal top.state),(IntConst 2)) True:(Operator Plus Next:(Terminal top.count),(Terminal top.value)))))))
```

--------------------------------

### Extract Finite State Machines with VerilogControlflowAnalyzer

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Use VerilogControlflowAnalyzer to extract Finite State Machines (FSMs) from Verilog designs. This requires prior dataflow analysis and optimization. Custom FSM variable patterns can be provided.

```python
from pyverilog.dataflow.dataflow_analyzer import VerilogDataflowAnalyzer
from pyverilog.dataflow.optimizer import VerilogDataflowOptimizer
from pyverilog.controlflow.controlflow_analyzer import VerilogControlflowAnalyzer

# Perform dataflow analysis first
analyzer = VerilogDataflowAnalyzer(['design.v'], topmodule='top')
analyzer.generate()

terms = analyzer.getTerms()
binddict = analyzer.getBinddict()

# Optimize the dataflow
optimizer = VerilogDataflowOptimizer(terms, binddict)
optimizer.resolveConstant()

resolved_terms = optimizer.getResolvedTerms()
resolved_binddict = optimizer.getResolvedBinddict()
constlist = optimizer.getConstlist()

# Create control-flow analyzer with custom FSM variable patterns
fsm_vars = ('fsm', 'state', 'count', 'cnt', 'step', 'mode')

canalyzer = VerilogControlflowAnalyzer(
    'top', terms, binddict,
    resolved_terms, resolved_binddict, constlist,
    fsm_vars
)

# Extract finite state machines
fsms = canalyzer.getFiniteStateMachines()

for signame, fsm in fsms.items():
    print(f'# SIGNAL NAME: {signame}')
    print(f'# DELAY CNT: {fsm.delaycnt}')

    # Display state transitions
    fsm.view()
    # Output:
    # 0 --(enable>'d0)--> 1
    # 1 --None--> 2
    # 2 --None--> 0

    # Generate state machine graph (requires pygraphviz)
    fsm.tograph(filename=f'{signame}_fsm.png', nolabel=False)

    # Get loop information
    loops = fsm.get_loop()
    print('Loops:', loops)
    # Output: ((0, 1, 2),)
```

--------------------------------

### Generate Verilog HDL from AST with ASTCodeGenerator

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Utilize ASTCodeGenerator to produce Verilog HDL code from Abstract Syntax Tree (AST) nodes. This supports round-trip engineering, allowing for programmatic hardware generation or modification of parsed Verilog code.

```python
from pyverilog.vparser.parser import VerilogCodeParser
from pyverilog.ast_code_generator.codegen import ASTCodeGenerator

# Parse existing Verilog and regenerate
codeparser = VerilogCodeParser(['design.v'])
ast = codeparser.parse()

codegen = ASTCodeGenerator()
verilog_code = codegen.visit(ast)
print(verilog_code)
```

--------------------------------

### Optimize Verilog Dataflow

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Optimizes Verilog dataflow trees by resolving constants and simplifying expressions. This is a prerequisite for control-flow analysis and graph generation. Requires prior dataflow analysis.

```python
from pyverilog.dataflow.dataflow_analyzer import VerilogDataflowAnalyzer
from pyverilog.dataflow.optimizer import VerilogDataflowOptimizer

# First perform dataflow analysis
analyzer = VerilogDataflowAnalyzer(['design.v'], topmodule='top')
analyzer.generate()

terms = analyzer.getTerms()
binddict = analyzer.getBinddict()

# Create optimizer
optimizer = VerilogDataflowOptimizer(terms, binddict)

# Resolve constant values throughout the design
optimizer.resolveConstant()
```

--------------------------------

### Analyze Verilog Dataflow

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Analyzes signal dataflow relationships in Verilog designs, extracting definitions, assignments, and dependencies. Supports configuration for top module, reordering, and binding. Outputs instances, terms, and binding dictionaries.

```python
from pyverilog.dataflow.dataflow_analyzer import VerilogDataflowAnalyzer

# Create analyzer for a design with specified top module
analyzer = VerilogDataflowAnalyzer(
    ['design.v'],
    topmodule='top',
    noreorder=False,  # Enable binding reordering
    nobind=False,     # Enable binding traversal
    preprocess_include=['./include'],
    preprocess_define=['SYNTHESIS']
)

# Generate dataflow analysis
analyzer.generate()

# Get module instances hierarchy
instances = analyzer.getInstances()
for module, instname in instances:
    print(f'Instance: {instname} of module {module}')

# Get signal terms (definitions)
terms = analyzer.getTerms()
for termname, term in terms.items():
    print(term.tostr())
# Output:
# (Term name:top.led type:{'Output'} msb:(IntConst 7) lsb:(IntConst 0))
# (Term name:top.count type:{'Reg'} msb:(IntConst 31) lsb:(IntConst 0))

# Get binding dictionary (signal assignments)
binddict = analyzer.getBinddict()
for bindname, binds in binddict.items():
    for bind in binds:
        print(bind.tostr())
# Output:
# (Bind dest:top.count tree:(Branch Cond:(Terminal top.RST) True:(IntConst 0) False:...))
```

--------------------------------

### Generated Verilog Module

Source: https://github.com/pyhdi/pyverilog/blob/develop/README.md

This is the Verilog HDL code generated by the Python script. It defines a module named 'top' with a parameter, inputs, an output, a register, and an always block for sequential logic.

```Verilog
module top #
(
  parameter DATAWID = 32
)
(
  input CLK,
  input RST,
  output [7:0] led
);

  reg [DATAWID-1:0] count;
  assign led = count[DATAWID-1:DATAWID-8];

  always @(posedge CLK) begin
    if(RST) begin
      count <= 0;
    end else begin
      count <= count + 1;
    end
  end


endmodule

```

--------------------------------

### PyVerilog Conditional Statement Syntax

Source: https://github.com/pyhdi/pyverilog/blob/develop/pyverilog/ast_code_generator/template/ifstatement.txt

Use this syntax for basic if-else conditional logic in PyVerilog templates. Ensure proper Jinja2 formatting for conditional expressions and statements.

```Python
if({{ cond }}) {{ true_statement }}
{%- if true_statement[-1] != ' ' and true_statement[-1] != '\n' %} {% endif -%}
{%- if true_statement.count('\n') == 0 and false_statement != '' %}
{% endif -%}
{%- if false_statement != '' %}else {{ false_statement }}{% endif -%}
```

--------------------------------

### VerilogDataflowAnalyzer

Source: https://context7.com/pyhdi/pyverilog/llms.txt

Analyzes signal dataflow relationships in Verilog designs to extract definitions, assignments, and dependencies.

```APIDOC
## VerilogDataflowAnalyzer(filenames, topmodule=None, noreorder=False, nobind=False, preprocess_include=None, preprocess_define=None)

### Description
Analyzes signal dataflow relationships in Verilog designs. This component extracts signal definitions, assignments, and dependencies to build a complete dataflow model.

### Methods
- **generate()** - Performs the dataflow analysis.
- **getInstances()** - Returns the module instances hierarchy.
- **getTerms()** - Returns the signal definitions (terms).
- **getBinddict()** - Returns the binding dictionary (signal assignments).
```

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