Crusoe Processor ppt

5/13/2018 Crusoe Processor ppt - slidepdf.com

http://slidepdf.com/reader/full/crusoe-processor-ppt 1/13

By:

www.tricksworld.net.tc



INTRODUCTION CRUSOE PROCESSOR FAMILY

MULTIPLE ISSUE MICROPROCESSORS

VLIW APPROACH CODE MORPHING CRUSOE’S KEY

PERFORMANCE OF CRUSOE PROCESSOR

CONCLUSION

REFERENCES



Crusoe processor is 128 bit microprocessorwhich is build for mobile computing deviceswhere low power consumption is required.

• VLIW based processor and x86 CodeMorphing software provide x86-compatiblemobile platform solution.

• Processor core operates at 500-700 MHz.



TM 5400:-500-700 mhz. 256k L2 cache TM 5500:-667-800 mhz 256k L2 cache

TM 5600:-500-700 mhz 512k L2 cache

TM 5800:-667-800 mhz 512K L2 cache



Several Functional Units (Integer ALUs,Floating Point Unit, Load/Store…)

Multiple instructions issued per cycle

Requires higher memory bandwidth and moreregisters

Two main flavors: Superscalar and VLIW.



Very Long Instruction Word processor

Multiple FU’s, each explicitly programmedon each instruction

A Very Long Instruction Word is called amolecule Each molecule contains 4 atoms: one

instruction for each FU.

A molecule is either 128 bits or 64 bitswide.



x86 instructions are converted to the Crusoeinstruction set through a software layer

During instruction translation, optimizationsand scheduling tricks can be performed

Crusoe Processor Architecture is decoupledfrom application software



Code Morphing software resides in ROM

Translations are performed dynamically and arecached

Successively aggressive optimizations areperformed each time a block is executed

VLIW Processor Core

Code Morphing Software

x86 OS/BIOS

x86 Applications



x86 exceptions are precise (Problematicfor out-of-order execution of instructions)

On an exception, processor state is rolled

back to the most recent commit. Execution proceeds in in-order mode until

the fault location is found



Typical Approach 1: Switch off processorquickly to save power (Can give glitches)

Typical Approach 2: Change clock rate by

suspending processor and restarting Crusoe 1: Adjust clock rate dynamically,

without suspension

Crusoe 2: Adjust voltage level

Result: Cubic power reduction, up to 30%.



The heatsink on the TM5400 Crusoe processor isquite small.

• Execution Time – Comparable to direct hardware implementation

by Intel or AMD



Transmeta has built an x86 Crusoe processorbased on VLIW technology

Code Morphing offers a new approach to theimplementation of an instruction setarchitecture

Crusoe offers the power of a high-performance Intel processor, consuming a

fraction of the power



DOUGLAS V HALL: Microprocessors

and interfacing

A.K.RAY and BHURCHANDI:

Advanced microprocessors and

pheripherals

Crusoe Processor ppt

Documents

Transcript of Crusoe Processor ppt