Which of the following MAC designs will achieve the

desired computation for the least total energy per useful computation on

average?  To help you in your

considerations, you can use the following data.   The average energy consumed in a cycle when

any of the inputs change are as follows:

Multiplier 50 pJ

Adder 20 pJ

Register 10 pJ

Mux 5 pJ

Note enable’s typical behavior is to go high for over 90%

of the time.  A and B change on all clock

cycles.

Each logic is implemented exactly as described.  The compiler performs no optimizations.

Choose one option.  Note the choice

button might be ABOVE the matching text. 

Don’t accidently choose the button below.