Question Bank - ICT

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The number of address input lines a 512X4 ROM circuit is ______.

A.
9
B.
512
C.
4
D.
256

Solution:

The correct answer is 9. The number of address input lines a 512X4 ROM circuit is:If we have n bit address and m bit words then our RAM size will be 2n x m. n= 7 m= 8RAM size= 128*8Basic RAM size = 128*8Required RAM size= 512*4Number of chips required = Desired RAM size/ Basic RAM size512*4/128*8= 2^9 *8Thus, 9 bits are required. Hence, the correct answer is 9.

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