Question

In a microprocessor with a 16-bit address bus, the most significant address lines A₁₅ to A₁₂ are used to select a 4096-word memory unit, while lines A₀ to A₁₁ are used to address a particular word in the memory unit. If the 3 least significant lines of the address bus A₀ to A₂ are short-circuited to ground, the addressable number of words in the memory unit is

Answer 1

A₁₅ to A₁₂ are used to select a 4096-word memory unit.

A₀ to A₁₁ are used to address a particular word.

A₀ to A₂ are short circuited

⇒ A₀ = A₁ = A₂ = 0.

Now, to represent an address we have any A₃ to A₁₁, i.e. total 9 address lines.

The number of words addressable = 2⁹ = 512.