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DDR SDRAM The Memory of Choice for Mobile Computing. Bill Gervasi Technology Analyst, Transmeta Corporation Chairman, JEDEC Memory Parametrics bilge@transmeta.com. Topics to Cover. Market Segments & Fragments Mobile Design Architectures DDR and SDR Power Analysis DDR SO-DIMM Details.

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ddr sdram the memory of choice for mobile computing

DDR SDRAMThe Memory of Choicefor Mobile Computing

Bill Gervasi

Technology Analyst, Transmeta Corporation

Chairman, JEDEC Memory Parametrics

bilge@transmeta.com

topics to cover
Topics to Cover
  • Market Segments & Fragments
  • Mobile Design Architectures
  • DDR and SDR Power Analysis
  • DDR SO-DIMM Details
segments fragments
Segments & Fragments

Servers

Workstations

PC Segment 2

PC Segment 1

PC Segment 0

Mobile

Graphics

DDR

PC100

PC133

PC100

PC133

DDR

Rambus

PC100

DDR

PC100

PC133

DDR

PC100

DDR

PC133

PC66

PC100

DDR

PC133

DDR (x16 and x32)

SS167

2H99

1H00

2H00

1H01

2H01

ram evolution
RAM Evolution

3200MB/s

MainstreamMemories

DDR II

2100MB/s

DDR

1000MB/s

SDR

400MB/s

Simple,incrementalsteps

320MB/s

EDO

FP

mobile designs
Mobile Designs

Mobile

Memory

Controller

  • Two Sockets, T-stub
  • 133MHz clock (for now)
  • 2.1GB/s transfer (for now)
butterfly so dimms
Butterfly SO-DIMMs

Motherboard

  • Perfect for notebook
    • Especially thin & light!
  • Single access door to both SO-DIMMs
  • Internet Appliance: 1 or 2 SO-DIMMs

SO-DIMM

SOCKET

CPU

CPUNB

SO-DIMM

SOCKET

mobile market requirements
Mobile Market Requirements
  • Low power, low heat
  • Long battery life
  • Small form factor
  • End-user upgrade
power cv 2 f
Power = CV2f%

Keys to mobile

design:

  • Reduce C and V
  • Match f to demand
  • Minimize duty cycle
  • Utilize power states

Factors:

  • Capacitance (C)
  • Voltage (V)
  • Frequency (f)
  • Duty cycle (%)
  • Power states
power capacitance
Power: Capacitance

Capacitance

Voltage

Frequency

Duty cycle

Power states

  • DDR capacitance 20% less than SDR
  • Tight circuit board design
  • Low parasitic sockets
power ddr vs sdr
Power: DDR vs SDR

Capacitance

Voltage

Frequency

Duty cycle

Power states

Lower Voltage meansLower Power

PC133

(3.3V)

2.0X

PC100

(3.3V)

1.2X

PC266

(2.5V)

1.0X

power ddr vs sdr1
Power: DDR vs SDR

Capacitance

Voltage

Frequency

Duty cycle

Power states

Double the Bandwidth yet Lower Power

PC266

1.0X

PC100

.31X

PC133

.25X

power frequency
Power: Frequency

Capacitance

Voltage

Frequency

Duty cycle

Power states

  • Memory speed to match task demand
    • Adjust memory clock for lowest power
  • Stream back to back operations on open bank, then close
    • DDR burst efficiency really shines
power duty cycle
Power: Duty Cycle

Capacitance

Voltage

Frequency

Duty cycle

Power states

  • Caches minimize memory demands
  • DDR cuts burst time in half
  • Get back into low power state sooner
long battery life
Long Battery Life
  • Lowest power to perform a task
  • Desktop performance expected
  • Battery extending technologies:
    • SpeedStepTM
    • LongRunTM

SpeedStep and LongRun are trademarks of Intel Corporationand Transmeta Corporation, respectively

introducing longrun tm
Introducing LongRunTM

Capacitance

Voltage

Frequency

Duty cycle

Power states

SpeedStep

LongRun

The number 11 is a trademark of Spinal Tap

longrun tm technology
LongRunTM Technology

Capacitance

Voltage

Frequency

Duty cycle

Power states

  • Smart reprogramming of memory frequency based on demand
    • CPU monitors trends in CPU demand
    • Automatically adjust CPU voltage,CPU & memory frequency as needed
  • Utilize all memory power states
    • Lowest power state possible
    • Close banks between bursts

LongRun is a trademark of Transmeta Corporation

longrun tm advantage
LongRunTM Advantage

Capacitance

Voltage

Frequency

Duty cycle

Power states

mobile market requirements1
Mobile Market Requirements
  • Long battery life
  • Low power, low heat
  • Small form factor
  • End-user upgrade
end user upgrade
End User Upgrade
  • DDR SO-DIMM Status
    • 63.6 x 31.75mm
    • 200 pins on .60mm centers, staggered
    • x64 and x72 (ECC) supported
    • JEDEC specification votes being counted
  • Multiple mobile designs in progress
  • Samples in test now, production 1Q01
  • Also great for small (Flex ATX) desktop
conclusions
Conclusions

DDR

  • Memory of choice for the future
  • Enables mobile computing
    • Low power yields long battery life
    • Small form factor end-user upgrades
  • Smart power management schemes
summary
Summary
  • DDR is here today
    • Double the bandwidth at lower power
    • Evolutionary design change over SDR
    • Applies to all market segments
  • Industry Standards
    • Detailed complete data sheet & models
    • Module designs on the web
    • Visit http://www.ami2.org