Transcript Mobile Processors

Mobile Processors
Intel StrongArm & Transmeta Crusoe
Presentation for CPS210, Spring '01
Jaidev Patwardhan & Vijay Abhijit
Jan 18th, 2001
Outline
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History
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Intel StrongArm
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Features
Architecture
Transmeta Crusoe
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Features
Architecture
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Comparison
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Conclusions
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Future
History
Started off with Intel's SL technology (1989)
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Allowed embedded code within CPU to slow down,
suspend or shut down
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Allowed shut downs during only certain periods of
inactivity
Advanced Power Management (1991)
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Intel and Microsoft
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Integrate OS into power management loop
History (contd)
Voltage Reduction Technology (1995)
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Operated at lower voltage than motherboard
First implementation on a 90MHz Pentium processor
Advanced Configuration and Power Interface
(1997)
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Intel, Toshiba and Microsoft
Enables demand-based power consumption
0.18 & 0.25 Micron Technology
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Processors interface to other components at 2.5 volts
Themselves run at 1.8V
Intel StrongArm Processor
Features
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High performance, Low-Power
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System-On-A-Chip
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RISC Architecture.
StrongArm Architecture
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Processing Core -Intel SA-1 core
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16-Kbyte instruction and 8-Kbyte data cache
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Memory and PCMCIA Control Module
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System Control Module - 28 GP I/O ports, RTC,
timers, power management controller, interrupt
controller, and on-chip oscillators.
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Peripheral Control Module - Six channel DMAC,
LCD controller, SDLC controller, UART, IrDA
serial port, Sync. serial port, USB
Transmeta Crusoe
Features
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Transmeta's premier product
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High Performance (Speeds upto 700MHz)
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Compatible with x86 applications
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Low power consumption
Crusoe Architecture
VLIW engine
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Two integer Units
Floating point Unit
One Memory Unit
Branch Unit
Crusoe processor long instruction word "Molecule"
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64 bits /128 bits long
Four RISC like instructions - "Atoms"
Atoms within molecule executed in parallel
StrongArm vs Crusoe
Strongarm
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Crusoe
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100MHz to 233 Mhz
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Compatibility problems
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Less flexible power
management
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Higher average power
consumption
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Targeted at PC world
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333 MHz to 700 Mhz
Code morphing
eliminates problems
Flexible frequency
scaling
Low average power
consumption
Targeted at Internet
devices
Conclusion & Future
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New technology (Code Morphing)
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Tending towards very low power consumption
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Advanced power management features
incorporated into modern processors
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New low power Pentium III processor
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True "Pocket" PC
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Peak power < 1W ??