com.cmpware.cmp.links
Class CellBE_MailboxStatus

java.lang.Object
  com.cmpware.cmp.Link
      com.cmpware.cmp.links.PipelineRegister
          com.cmpware.cmp.links.CellBE_MailboxStatus

All Implemented Interfaces:

MemoryMappedIOReader, MemoryMappedIOWriter

public class CellBE_MailboxStatus
extends PipelineRegister

This class extends the pipeline register. It is used to collect status from three other shared registers and provide status for the mailboxes in the Cell BE. Note that currently the SPU in mailbox status will return '1' if one or more values is available for read. This should not impact functionality.

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

Author:

SAG

Field Summary

static java.lang.String	copyright Copyright string
protected CellBE_FIFO	spuInMbox The SPU in mail;box
protected CellBE_SharedRegister	spuOutMbox The SPU out mailbox
protected CellBE_SharedRegister	spuOutMboxI The SPU out mailbox with interrupts

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

readAddr, readCount, shadow, val, writeAddr, writeCount

Constructor Summary

CellBE_MailboxStatus(CellBE_SharedRegister spuOutMbox, CellBE_SharedRegister spuOutMboxI, CellBE_FIFO spuInMbox)
This constructor sets up the mailbox status port.

Method Summary

int	read() This method reads a value from the Memory Mapped IO port.
void	write(int val) This method writes a word to the Memory Mapped IO.

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

getReadAddress, getReadCount, getReadStallCount, getValue, getWriteAddress, getWriteCount, getWriteStallCount, isReadable, isWriteable, readCommit, reset, setReadAddress, setWriteAddress, 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

spuOutMbox

protected CellBE_SharedRegister spuOutMbox

The SPU out mailbox

spuOutMboxI

protected CellBE_SharedRegister spuOutMboxI

The SPU out mailbox with interrupts

spuInMbox

protected CellBE_FIFO spuInMbox

The SPU in mail;box

Constructor Detail

CellBE_MailboxStatus

public CellBE_MailboxStatus(CellBE_SharedRegister spuOutMbox,
                            CellBE_SharedRegister spuOutMboxI,
                            CellBE_FIFO spuInMbox)

This constructor sets up the mailbox status port.

Parameters:

spuOutMbox - the SPU outbound mailbox

spuOutMboxI - the SPU outbound mailbox wit interrupts

spuInMbox - the SPU inbound FIFO mailbox

Method Detail

write

public void write(int val)
           throws MemoryMappedIOException

Description copied from interface: MemoryMappedIOWriter

This method writes a word to the Memory Mapped IO.

Specified by:

write in interface MemoryMappedIOWriter

Overrides:

write in class PipelineRegister

Parameters:

val - The value to write to the Memory Mapped IO.

Throws:

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

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 PipelineRegister

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.