DRAM

In DDR-family DRAM, which feature places termination resistors inside the DRAM chip, with controllable on/off, to suppress signal reflections?

  1. ASelf-refresh
  2. BODT (on-die termination)
  3. CECC
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Answer: B. ODT (on-die termination)

At high signal speeds, reflections at the end of a line distort the waveform. ODT places termination resistors inside the DRAM chip and enables them only when needed. It reduces components on the board while maintaining good signal quality even on buses shared by several modules.

  • A. Self-refresh lets the DRAM refresh itself while idle.
  • B. Correct. It is on-chip termination.
  • C. ECC corrects errors and is unrelated to termination.
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  1. Some DRAM cells have a data retention time that irregularly switches between longer and shorter values over time. What is this phenomenon called?
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