XDR DRAM

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Description:
XDR DRAM or extreme data rate dynamic random access memory is a high-performance RAM interface and successor to the Rambus RDRAM it is based on, competing with the rival DDR2 SDRAM and GDDR4 technology. XDR was designed to be effective in small, high-bandwidth consumer systems, high-performance memory applications, and high-end GPUs. It eliminates the unusually high latency problems that plagued early forms of RDRAM. Also, the XDR DRAM have heavy emphasis on per pin bandwidth, which can benefit further cost control on PCB production. This is because fewer lanes are needed for the same amount of bandwidth. Rambus owns the rights to the technology. XDR is used by Sony in the PlayStation 3 console.

Parameters

Performance

  • Initial clock rate at 400 MHz.
  • Octal Data Rate (ODR): Eight bits per clock cycle per lane.
  • Each chip provides 8, 16, or 32 programmable lanes, providing up to 230.4 Gbit/s (28.8 GB/s) at 900 MHz (7.2 GHz effective).


Features

  • Bi-directional differential Rambus Signalling Levels (DRSL)
    • This uses differential open-collector driver, voltage swing 0.2V. It is not the same as LVDS.
  • Programmable on-chip termination
  • Adaptive impedance matching
  • Eight bank memory architecture
  • Up to four bank-interleaved transactions at full bandwidth
  • Point-to-point data interconnect
  • Chip scale package packaging
  • Dynamic request scheduling
  • Early-read-after-write support for maximum......
  • ...

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