ME TEST SERIES

Question

A computer system that uses memory mapped I/O configuration, has a 32 bit address space. Address with 1’s in 4 MSB refers to devices. What is the maximum amount of memory and port addresses that can be referenced in such system respectively?

Answer 1

u have 32 bits address space 
when first 4 bits r 1's then it refers device so we can define atmost $2^{28}$ ports using this

nd for memory we can define atmost $(2^{4}-1)\times2^{28}$ or $15* 2^{28}$     unique addresses  

or $2^{32}-2^{28} =15 * 2^{28}$ 

Comments

Tnx bro...their answer 15*2^25 is wrong?

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yes ...