anized as 8 GX 256 K x 256 K: geach row take eshed at least c age (rounded to available for ead/write opera

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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A 64 Gb DRAM chip is organized as 8 G × 8
memory externally and as 256 K × 256 K square
array internally. Refreshing each row takes 20
ns. Each row must be refreshed at least once
every 0.05 s. The percentage (rounded to the
closet integer) of the time available for
performing the memory read/write operations in
the main memory unit is
Transcribed Image Text:A 64 Gb DRAM chip is organized as 8 G × 8 memory externally and as 256 K × 256 K square array internally. Refreshing each row takes 20 ns. Each row must be refreshed at least once every 0.05 s. The percentage (rounded to the closet integer) of the time available for performing the memory read/write operations in the main memory unit is
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