Consider the the following codes exactly as described. Which is likely to give the lowest overall power consumption if E is high for only 10% of the clock cycles but A and B change on 90% of the clock cycles. For this question assume that the energy per operation is as follows:

Adder = 50 fJ

Register with enable = 10 fJ

Mux = 5 fJ

Question

Consider the the following codes exactly as described. Which is likely to give the lowest overall power consumption if E is high for only 10% of the clock cycles but A and B change on 90% of the clock cycles. For this question assume that the energy per operation is as follows:

Adder = 50 fJ

Register with enable = 10 fJ

Mux = 5 fJ

Adder = 50 fJ

Register with enable = 10 fJ

Mux = 5 fJ

Accepted Answer

always@(posedge clock) 
 begin 
 if (E) An <= A; 
 if (E) Bn <= B; 
 end 
   
 always@(*) C<=An+Bn;

Answer

always@(posedge clock) 
 begin 
 An <= A; 
 Bn <= B; 
 end 
 always@(*) if(E) C<=An+Bn;

Answer

always@(posedge clock) 
 if (E) C <= A+B;

Answer

always@(posedge clock) 
 begin 
 if (E) An <= A; else An<=0; 
 if (E) Bn <= B; else An<=0; 
 end 
   
 always@(*) C<=An+Bn;

Crowdly

Consider the the following codes exactly as described. Which is likely to give t...

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