com.cmpware.cmp.links
Class CellBE_SharedRegister

java.lang.Object
  com.cmpware.cmp.Link
      com.cmpware.cmp.links.SharedRegister
          com.cmpware.cmp.links.CellBE_SharedRegister

All Implemented Interfaces:

MemoryMappedIOReader, MemoryMappedIOWriter

public class CellBE_SharedRegister
extends SharedRegister

This class extends the standard shared register for the Cell BE. The only difference is that the read does not stall and over-reads the data quietly. This implements the functionality of the PPU to SPU mailbox channels.

Copyright (c) 2007 Cmpware, Inc. All Rights Reserved.

Author:

SAG

Field Summary

static java.lang.String

copyright Copyright string

Fields inherited from class com.cmpware.cmp.links.SharedRegister

mmioe, readAddr, readCount, readStallCount, shreg, shregShadow, writeAddr, writeCount, writeStallCount

Constructor Summary

CellBE_SharedRegister()

Method Summary

int	read() This method reads a value from the Memory Mapped IO port.

Methods inherited from class com.cmpware.cmp.links.SharedRegister

clear, getReadAddress, getReadCount, getReadStallCount, getValue, getWriteAddress, getWriteCount, getWriteStallCount, isReadable, isSet, isWriteable, readCommit, reset, set, setReadAddress, setWriteAddress, write, writeCommit

Methods inherited from class com.cmpware.cmp.Link

get, setBufferSize

Methods inherited from class java.lang.Object

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

Field Detail

copyright

public static final java.lang.String copyright

Copyright string

See Also:

Constant Field Values

Constructor Detail

CellBE_SharedRegister

public CellBE_SharedRegister()

Method Detail

read

public int read()
         throws MemoryMappedIOException

Description copied from interface: MemoryMappedIOReader

This method reads a value from the Memory Mapped IO port.

Specified by:

read in interface MemoryMappedIOReader

Overrides:

read in class SharedRegister

Returns:

This method reads a value from the Memory mapped IO port.

Throws:

MemoryMappedIOException - - this method throws a MemoryMappedIOException if the read could not be completed on this cycle. This will typically cause a stall of the processor and a retry on the next cycle.