A1256656557iAxBF - PowerPoint PPT Presentation

Title: A1256656557iAxBF


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Aphirak Jansang 43650357 Thiranun Dumrongson
43650118
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Agenda

• Overview
• Design Goals
• Crusoe Family
• Crusoe Architecture
• Crusoe Technology
• Code Morphing
• LongRun Technology
• Conclusion
• Reference

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Overview

• In January of 2000, Transmeta Corporation
  introduced the Crusoe processors,
• An x86-compatible family of solutions that
  combines strong performance with remarkably low
  power consumption.
• Crusoe is pitched as a "hybrid software -
• hardware" CPU.

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Design Goals

• Designed for the new world of Ultra-light mobile
  PCs and Internet devices
• Remarkably low power consumption
• High performance
• Full x86 compatibility

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Crusoe Family
For light weight Notebook Computers running Micros
oft Windows Power Typical 1W ,Sleep 20mW
For Internet Appliances running Mobile
Linux Power Typical 1.5W ,Sleep 60mW
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Crusoe Architecture

• Compatible with any x86 App OS
• Code Morphing software
• Morphs x86 to VLIW
• High Speed, Low Power VLIW Engine

• VLIW Code Morphing x86 compatible solution

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Crusoes Core

• The core of Crusoe is a VLIW (Very Long
  Instruction Word) architecture.
• Crusoe is a four instruction wide VLIW
  architecture capable of four operations per clock
  cycle. The execution engine consists of
• 1 Branch predict unit
• 1 Load Store unit
• 2 ALU's
• 1 FPU (Floating Point Unit)

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VLIW architecture
Atoms and molecules the instruction format

• The execution units are called "atoms
• These atoms are packaged together into either
• 128- or 64-bit chunks called "molecules"

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Crusoe Technology
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Advantages of aSoftware Based Microprocessor
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Hardware-Software Line
The blue is hardware. The yellow is
software.
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Code Morphing

• What are the keys to Code Morphing software?
• Translates x86 compatible PC applications to VLIW
  hardware

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Translation of PC Applications to VLIW(x86
Instructions Converted to VLIW)
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Dynamic Software Execution
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Dynamic Software Execution (2nd Pass)
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Code Morphing

• What are the keys to Code Morphing software?
• Translates x86 compatible PC applications to VLIW
  hardware
• Learns and optimizes the application

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Crusoe ProcessorSoftware Optimization

• A Smart Processor analyzes the programs you run
• Optimization begins as soon as programs are
  launched
• Code MorphingTM detects the top running blocks
• Uses techniques beyond out of order engine
• Benefits
• Good Performance
• Low Power (reduced number of executions)

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Code Morphing

• What are the keys to Code Morphing software?
• Translates x86 compatible PC applications to VLIW
  hardware
• Learns and optimizes the application
• Produces measurable benefits to Transmeta users

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Processor Thermal Comparison
Pentium III Playing DVD 105.5º C 221.9º F
Crusoe Processor Playing DVD 48.2º C 118.8º F
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Code Morphing

• What are the keys to Code Morphing software?
• Translates x86 compatible PC applications to VLIW
  hardware
• Learns and optimizes the application
• Produces measurable benefits to Transmeta users
• Provides a platform for future extensions
  (features)

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LongRun Technology

• A New Invention for
• Power Management

Maximizing Battery Life While Optimizing
Performance
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LongRun Technology in Operation

• Crusoe processor starts off at
• 700MHz
• Code Morphing software
• detects user activity
• The software dynamically
• adjusts MHz and voltage to
• the most efficient power level

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How Crusoe Saves Power

• Power Capacitance x Frequency x (Voltage)2

Related to number of logic transistors
LongRun can dynamically adjust both only because
of Code Morphing Software
Crusoe has fewer transistors due to the software
approach
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Conclusion

• Crosoe is low-power and high perfromance
  processor.
• Consists of a hardware VLIW core as its engine
  and a software layer called Code Morphing TM
  software.
• Designed for lightweight (two to four pound)
• mobile computers and Internet access devices

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Reference

• http//arstechnica.com/cpu/1q00/crusoe/
• http//www.transmeta.com
• The Technology Behind Crusoe ,Processors
  Alexander Klaiber , Transmeta Corporation ,
  January 2000
• http//www.hardwarecentral.com/hardwarecentral/pre
  views/2557/1/
• http//www.beyond3d.com/articles/transmeta/