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High Performance Next­Generation Memory Technology and Beyond. Dean Klein, Vice President of Market Development Micron Technology, Inc. Predicted. DDR2. DDR3. DDR. SDRAM. Data Transfer Rate Trends PC Main Memory. DRAM bandwidth requirements are doubling approximately every 3 years.

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High performance next generation memory technology and beyond

High Performance Next­Generation Memory Technology and Beyond

Dean Klein, Vice President of Market Development

Micron Technology, Inc.


Data transfer rate trends pc main memory

Predicted Beyond

DDR2

DDR3

DDR

SDRAM

Data Transfer Rate TrendsPC Main Memory

DRAM bandwidth requirements are doubling approximately every 3 years


256mb ddr2 preferred memory solution for 512mb dual channel systems
256Mb DDR2 BeyondPreferred Memory Solution for 512MB Dual­Channel Systems

  • Signal integrity limits bus loading at higher transfer rates. No longer able to put 4 DIMMs on one memory channel

5 1 2 M B

D I M M

5 1 2M B

D I MM

2 5 6 M B

D

I M M

2 5 6M B

D I MM

2 5 6 M B

D I M M

2 5 6M B

D I MM

Total 4.26 GB/s for DDR533

Total 8.52 GB/s for DDR533

Memory Controller

Memory Controller

4.26 GB/s

4.26 GB/s

4.26 GB/s

Dual channel provides 2X the bandwidth


Gddr3
GDDR3 Beyond

  • Graphics memory will lead I/O definition for desktop and server main memory

  • GDDR3 features

    • 8 Meg x 32 configuration

    • Up to 800 MHz (1600 Mb/s)

    • 1.8V VDD/VDDQ

    • Four internal banks

    • 4n prefetch

    • ODT

    • Calibrated output drive


Memory per pin data rate trends
Memory per­Pin Data Rate Trends Beyond

Graphics

4000

GDDR4

3000

GDDR3

2000

Device Data Rate (Mb\s per Pin)

PC

DDR3

1000

DDR2

0

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

Year


Ddr3 signaling
DDR3 Signaling Beyond

  • DDR3 requirement is 800 MT/s-1600 MT/s

  • Migration can leverage from GDDR3

    • GDDR3 is designed for operation at 1000 MT/s-1500 MT/s

    • DQs on GDDR3 are point­to­point

    • DQs utilize VDDQ terminated push-pull drivers

Typical 128­bit Bus/Dual Load Graphics System


Ddr3 pc data bus
DDR3 PC Data Bus Beyond

Module 1

Rank 1

Rank 2

Single DIMM in point­to­point configuration

Term

Term

RCVR

RCVR

System Controller

  • On­die termination simulations with two loads at 1066 MT/s data rate

    • Improved signal integrity

Reads

Writes

Signal Voltage (V)

Signal Voltage (V)

Time (nanoseconds)

Time (nanoseconds)


Ddr3 server data bus
DDR3 Server Data Bus Beyond

Module 1

Module 2

Rank 1

Rank 2

Rank 1

Rank 2

Hubs added to DIMM drive DRAMs and allow multiple DIMMs per DQ Bus

Term

Term

Term

Term

RCVR

RCVR

RCVR

RCVR

Data Buffer

Data Buffer

DRVR

DRVR

DRVR

RCVR

DRVR

RCVR

System Controller

High­Speed System Bus

More DIMMs

Reads

Writes

  • On-die termination simulations with two loads at 1600 MT/s data rate

Signal Voltage (V)

Signal Voltage (V)

Time (nanoseconds)

Time (nanoseconds)


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