220-801 Question #222: Real Exam Question with Answer & Explanation

The correct answer is D: Reading or writing twice per clock signal. DDR (Double Data Rate) memory transfers data on both the rising edge and the falling edge of each clock cycle, effectively doubling the data transfer rate compared to single data rate (SDR) memory without increasing the clock frequency. The key word is 'or' - in any given clock c

Question

Which of the following describes a function of dual data rate memory?

Options

ACorrecting errors in memory twice per clock signal
BReading and writing twice per clock signal
CRefreshing the level 3 cache twice per clock signal
DReading or writing twice per clock signal

Explanation

DDR (Double Data Rate) memory transfers data on both the rising edge and the falling edge of each clock cycle, effectively doubling the data transfer rate compared to single data rate (SDR) memory without increasing the clock frequency. The key word is 'or' - in any given clock cycle, the memory is either reading or writing, but it does so twice per cycle (on both edges). It does not simultaneously read and write (which would be option B), nor does it correct errors or refresh cache.

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