Which of the following BEST explains how the data rate is doubled in DDR RAM?

The correct answer is D. Data transfer on both clock edges. DDR stands for Double Data Rate. Standard (SDR) SDRAM transfers data only on the rising edge of the clock signal. DDR RAM transfers data on both the rising edge AND the falling edge of each clock cycle, effectively doubling throughput without requiring a higher clock frequency…

Hardware

Question

Options

ACPU clock speed is doubled
BUses 64-bit instead of 32-bit architecture
CMemory clock speed is doubled
DData transfer on both clock edges

How the community answered

(41 responses)

A
2% (1)
B
2% (1)
C
7% (3)
D
88% (36)

Explanation

DDR stands for Double Data Rate. Standard (SDR) SDRAM transfers data only on the rising edge of the clock signal. DDR RAM transfers data on both the rising edge AND the falling edge of each clock cycle, effectively doubling throughput without requiring a higher clock frequency. The CPU clock speed and bus width are unrelated to this mechanism, and the memory clock itself is not doubled - the trick is using both edges of the existing clock.

Topics

#DDR RAM#clock edges#data transfer#memory architecture

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