If “enable” is high only 10% of the time, and the code below is synthesized, which of the following will have the lowest power consumption.

Question

If  “enable” is high only 10% of the time, and the code below is synthesized, which of the following will have the lowest power consumption.

Answer

These all consume the same power

Answer

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

Answer

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

Answer

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

Answer

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

Crowdly

If “enable” is high only 10% of the time, and the code below is synthesized, wh...

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