1 Aphirak Jansang Thiranun Dumrongson

2 Agenda OverviewOverview Design GoalsDesign Goals Crusoe FamilyCrusoe Family Crusoe ArchitectureCrusoe Architecture Crusoe TechnologyCrusoe Technology Code MorphingCode Morphing LongRun TechnologyLongRun Technology ConclusionConclusion ReferenceReference

3 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.

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

5 Crusoe Family For light weight Notebook Computers running Microsoft Windows Power : Typical 1W,Sleep 20mW For Internet Appliances running Mobile Linux Power : Typical 1.5W,Sleep 60mW

6 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

7 Crusoe’s 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)

8 VLIW architecture The execution units are called "atoms These atoms are packaged together into either 128- or 64-bit chunks called "molecules" Atoms and molecules: the instruction format

9 Crusoe Technology

10 Advantages of a Software Based Microprocessor

11 Hardware-Software Line The blue is hardware. The yellow is software.

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

13 Translation of PC Applications to VLIW (x86 Instructions Converted to VLIW)

14 Dynamic Software Execution

15 Dynamic Software Execution (2nd Pass)

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

17 Crusoe Processor Software 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)

18 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

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

20 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)

21 LongRun Technology LongRun Technology A New Invention for Power Management “ Maximizing Battery Life While Optimizing Performance ”

22 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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24 How Crusoe Saves Power Power = Capacitance x Frequency x (Voltage)2 Crusoe has fewer transistors due to the software approach Related to number of logic transistors Related to number of logic transistors LongRun can dynamically adjust both only because of Code Morphing Software LongRun can dynamically adjust both only because of Code Morphing Software

25 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

26 Reference The Technology Behind Crusoe™,Processors Alexander Klaiber, Transmeta Corporation, January views/2557/1/