Question

Consider a hypothetical process which supports a maximum of 512 MB of byte addressable memory. Processor uses memory mapped I/O configuration: in which 3 most significant bits of address needs to be zero to assign the addrss to I/O-Port. How many number of port addresses (I/O addresses) and memory addresses possible in the processor respectively?

• A. $1\times 2^{26}and3\times 2^{26}$
• B. $2^{26}and{2}^{29}$
• C. $1\times 2^{26}and7\times 2^{26}$
• D. $1\times 2^{29}and7\times 2^{29}$

Answer 1

The correct option is C $1\times 2^{26}and7\times 2^{26}$

For memory size 512MB $=2^{29}B$ address size = 29-bits

Assume address bits are