Memory Hierarchy Q.65

0. A RAM chip has capacity of 1024 words of 8 bits each (1K × 8). The number of 2 × 4 decoders with enable line needed to construct a 16 K × 16 RAM from 1K × 8 RAM is

Answer
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Array

Option : B
Explanation : RAM chip size = 1k * 8[1024 words of 8 bits each]
RAM to construct = 16k * 16
Number of chips required = (16k * 16)/(1k * 8)
= (16 * 2)
[16 chips vertically with each having 2 chips horizontally]
So to select one chip out of 16 vertical chips, we need 4 * 16 decoder.
Available decoder is 2 * 4 decoder
To be constructed is 4 * 16 decoder
Hence 4 + 1 = 5 decoders are required.

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