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Hardware interview practice

Convert DDR Clock Rate into Bus Bandwidth

EasyTimingSystemVerilog

Two ideal 64-bit memory buses use an 800 MHz clock. One is single-data-rate; the other transfers data on both clock edges. Ignore command overhead and idle cycles. Which peak-rate comparison is correct?

Choose one

Answer choices

  1. A. SDR provides 1600 MT/s while DDR provides 800 MT/s because DDR uses half-rate command timing.
  2. B. Both provide 800 MT/s and 6.4 GB/s because their physical clock frequency is the same.
  3. C. DDR provides 1600 MHz and 102.4 GB/s because the 64-bit width is multiplied without converting bits to bytes.
  4. D. SDR provides 800 MT/s or 6.4 GB/s, while DDR provides 1600 MT/s or 12.8 GB/s.
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