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Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM) is a class of memory integrated circuits used in computers. The DDR SDRAM interface makes higher transfer rates possible by more strict control of the timing of the electrical data and clock signals. With data being transferred 64 bits at a time, DDR SDRAM gives a transfer rate of (memory bus clock rate) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus, with a bus frequency of 400MHz, DDR SDRAM gives a maximum transfer rate of 6400 MB/s.


200 edge connector pads
Clock Frequency 400 MHz
SSTL-2 interface 2.6 Voltage +/- 0.2V
Package TSOP


Specifications:

  • Double Data Rate architecture
  • Bandwidth(max.): 2.1GB/s
  • JEDEC standard
  • Serial Presence Detect support
  • MRS cycle with address key programs
    * CAS latency: 2
    * Burst length: 2
    * Burst type: Sequential & Interleave
  • 2 variations of refresh
    * Auto refresh
    * Self refresh



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