In modern computer memory, what does 'DDR' stand for in DDR4 or DDR5 SDRAM?
Answer and explanation
Correct answer: A. Double Data Rate
- Step 1: Early Synchronous DRAM (SDR SDRAM) transferred data only once per clock cycle, on the rising edge.
- Step 2: Double Data Rate (DDR) memory transfers data on both the rising edge and falling edge of the clock signal, doubling the effective data transfer rate at the same bus frequency.
Answer
Double Data Rate
Why not the others: 'Dynamic Data Routing' Dynamic Data Routing refers to network packet switching algorithms, not memory bus clocking; 'Dual Distributed RAM' Distributed RAM refers to FPGA internal logic block memory, not system SDRAM; 'Direct Drive Registry' Direct Drive Registry is an unrelated phrase with no hardware memory meaning.
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