Package io.matita08.logic

Enum Class Phase

java.lang.Object

java.lang.Enum<Phase>

io.matita08.logic.Phase

All Implemented Interfaces:

Serializable, Comparable<Phase>, Constable

public enum Phase
extends Enum<Phase>

CPU Execution Phases - Instruction Cycle States.

This enum defines the three primary phases of CPU instruction execution following the classical fetch-decode-execute cycle. Each phase is associated with its corresponding execution logic.

The CPU execution cycle:

1. Fetch - Retrieve instruction from memory
2. Decode - Decode instruction and prepare operands
3. Execute - Execute the instruction operation
4. None - Default state

Since:

1.0

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
Decode	DECODE Phase - Instruction Interpretation.
Execute	EXECUTE Phase - Instruction Execution.
Fetch	FETCH Phase - Instruction Retrieval.
None	NONE Phase - Default State.

Method Summary

Modifier and Type	Method	Description
void	run()	Executes the action associated with this phase.
static Phase	valueOf(String name)	Returns the enum constant of this class with the specified name.
static Phase[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

Fetch

public static final Phase Fetch

FETCH Phase - Instruction Retrieval.

Retrieves the next instruction from memory at the address specified by the Program Counter, loads it into the Instruction Register, and increments the PC for the next instruction.

Decode

public static final Phase Decode

DECODE Phase - Instruction Interpretation.

Decodes the instruction in the IR, looks up the corresponding operation, and prepares the control unit for instruction execution including setting up cycle counts.

Execute

public static final Phase Execute

EXECUTE Phase - Instruction Execution.

Executes the decoded instruction operation, handling multi-cycle instructions and coordinating with memory, ALU, and I/O systems as required by the specific instruction.

None

public static final Phase None

NONE Phase - Default State.

Represents an inactive or uninitialized CPU state where no operation is being performed. Used during system initialization.

Method Details

values

public static Phase[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static Phase valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

run

public void run()

Executes the action associated with this phase.

Calls the phase-specific execution logic to perform the appropriate CPU operations for this phase of the instruction cycle.