If “enable” is high around 30% of the time, and the code below is synthesized, which of the following will have the lowest power consumption.

Question

If  “enable” is high around 30% of the time, and the code below is synthesized, which of the following will have  the lowest power  consumption.

Answer

wire [31:0] A, B, AA, BB; 
 reg [31:0] E; 
 always@(posedge clock) 
   begin 
      E <= AA * BB; 
 end 
 assign AA = enable ? A : 0; 
 assign BB = enable ? B : 0;

Answer

wire [31:0] A, B, D; 
 reg [31:0] E; 
 always@(posedge clock) 
   begin 
      if (enable) E <= A * B; 
   end

Answer

These all consume the same power.

Answer

wire [31:0] A, B; 
 reg [31:0] AA, BB, E; 
 always@(posedge clock) 
   begin 
      AA <= enable ? A : 0; 
      BB <= enable ? B : 0; 
      E <= AA * BB;  
   end

Answer

wire [31:0] A, B; 
 reg [31:0] E, AA, BB; 
 always@(posedge clock) 
   begin 
      if (enable) AA <= A; 
 if (enable) BB <= B; 
      E <= AA * BB; 
   end

Crowdly

If “enable” is high around 30% of the time, and the code below is synthesized, ...

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