total address space

Question

For a computer address,if we reduce the no of bits by 2 and if we double the addressability then total address space will be

1) Doubled 2) halved 3) Remain Same  4) None

What is meant by Addressablity???

 

Answer 1

the way in which computer identifies memory is called addressability.

now in 1 bit address bus we can access 2 memory address(0 and 1)

similarly 2 bit add bus can access 4 memory add(00,01,10,11)

now take any address for ex sy 6 bit add

6 bit address have 2^6 =64 bytes memory

now if we reduce address by 2 bit say 6-2=4 bit means  

add is now 2^4 =16 bytes if we double it 16x2=32 bytes

so acc to me it halved

Answer 2

3)Remain same

Adressable means at a time how many bits or Bytes it is accessing

Byte Addressable means it is accessing 8 bit at a time

Comments

yes, 2 bits means address space becomes $2^2$ = 1/4 times.

---

ok then tag size reduces 1/4 and block size doubled So, total address space reduces and it will be halved. rt now?

---

Ok..
First of All I am nt getting this question properly. and I have couple of question???

1)reducing the no of bits by 2 means reducing the tag bits?? how do we came to know about this...

2)Also, How The address space becomes 1/4 times by reducing 2 bits.??

3)What is meant by total address space, Is the Total Address Space will be Tag Size*Block Size ?????

Please explain....