hades.models.mips.mipsmemory
Class NullMemory

java.lang.Object
  hades.models.mips.mipsmemory.NullMemory

All Implemented Interfaces:

Memory, MipsMemory, Resetable

public class NullMemory

extends java.lang.Object

implements Resetable, MipsMemory

This MipsMemory ignores every write access and always returns 0 on read requests. Its purpose is to provide address space that is not implemented and will be ignored.

Field Summary

protected java.lang.String	name
protected boolean	reportAccess
protected int	size

Constructor Summary

NullMemory(ResetHandler resetHandler, int newSize, java.lang.String newName, boolean newReportAccess)

Method Summary

boolean	beginCycle() next cycle, perform access to lower layer if needed, wait returned
void	endCycle() end of a cycle, all core actions are done, memory actions can complete
boolean	finished() request end of read or write access
boolean	getHit(int adr) Is data present at the specified address?
boolean	getLog() Get debug mode
int	getMemorySize() Capacity of the memory in words
java.lang.String	getName() get the name of this memory
int	getReadResult() get the result of the last read operation
int	getWordWidth() Witdh of one word in bits
void	installEntryHandler(EntryHandler entryHandler) setEntry() calles this EntryHandler
void	por() Power on reset or hardware reset
void	read(int adr, boolean burst) Drive busses for read access
int	readMemory(int address) Read a word from the memory
void	reset() software reset
void	setEntry(int entry, int globalPointer) Set the entry address and the global pointer if memory contains a executable program
void	setLog(boolean newDebug) Enable or disable logging output
void	setName(java.lang.String newName) Set the name of this memory
void	write(int adr, int data) Drive busses for write access
void	writeMemory(int address, int word) Write a word into the memory

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

size

protected int size

name

protected java.lang.String name

reportAccess

protected boolean reportAccess

Constructor Detail

NullMemory

public NullMemory(ResetHandler resetHandler,
                  int newSize,
                  java.lang.String newName,
                  boolean newReportAccess)

Method Detail

por

public void por()

Power on reset or hardware reset

Specified by:

por in interface Resetable

reset

public void reset()

software reset

Specified by:

reset in interface Resetable

beginCycle

public boolean beginCycle()

Description copied from interface: MipsMemory

next cycle, perform access to lower layer if needed, wait returned

Specified by:

beginCycle in interface MipsMemory

endCycle

public void endCycle()

Description copied from interface: MipsMemory

end of a cycle, all core actions are done, memory actions can complete

Specified by:

endCycle in interface MipsMemory

finished

public boolean finished()

Description copied from interface: MipsMemory

request end of read or write access

Specified by:

finished in interface MipsMemory

getHit

public boolean getHit(int adr)

Description copied from interface: MipsMemory

Is data present at the specified address?

Specified by:

getHit in interface MipsMemory

getName

public java.lang.String getName()

Description copied from interface: MipsMemory

get the name of this memory

Specified by:

getName in interface MipsMemory

setName

public void setName(java.lang.String newName)

Description copied from interface: MipsMemory

Set the name of this memory

Specified by:

setName in interface MipsMemory

setLog

public void setLog(boolean newDebug)

Description copied from interface: Memory

Enable or disable logging output

Specified by:

setLog in interface Memory

getLog

public boolean getLog()

Description copied from interface: Memory

Get debug mode

Specified by:

getLog in interface Memory

write

public void write(int adr,
                  int data)

Drive busses for write access

Specified by:

write in interface MipsMemory

read

public void read(int adr,
                 boolean burst)

Description copied from interface: MipsMemory

Drive busses for read access

Specified by:

read in interface MipsMemory

getReadResult

public int getReadResult()

Description copied from interface: MipsMemory

get the result of the last read operation

Specified by:

getReadResult in interface MipsMemory

getWordWidth

public int getWordWidth()

Description copied from interface: Memory

Witdh of one word in bits

Specified by:

getWordWidth in interface Memory

getMemorySize

public int getMemorySize()

Description copied from interface: Memory

Capacity of the memory in words

Specified by:

getMemorySize in interface Memory

readMemory

public int readMemory(int address)

Description copied from interface: Memory

Read a word from the memory

Specified by:

readMemory in interface Memory

writeMemory

public void writeMemory(int address,
                        int word)

Description copied from interface: Memory

Write a word into the memory

Specified by:

writeMemory in interface Memory

setEntry

public void setEntry(int entry,
                     int globalPointer)

Description copied from interface: Memory

Set the entry address and the global pointer if memory contains a executable program

Specified by:

setEntry in interface Memory

installEntryHandler

public void installEntryHandler(EntryHandler entryHandler)

Description copied from interface: Memory

setEntry() calles this EntryHandler

Specified by:

installEntryHandler in interface Memory