Q7

MCQ1 mark, −0.33

The main memory unit with a capacity of $4$ $\text{megabytes}$ is built using $1\text{M} \times \text{1-bit}$ DRAM chips. Each DRAM chip has $1\text{K}$ rows of cells with $1\text{K}$ cells in each row. The time taken for a single refresh operation is $100\; \text{nanoseconds}$ . The time required to perform one refresh operation on all the cells in the memory unit is

(A)

$100$ nanoseconds

(B)

$100\times 2^{10}$ nanoseconds

(C)

$100\times 2^{20}$ nanoseconds

(D)

$3200\times 2^{20}$ nanoseconds

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