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. Don’t forget about resource sharing and optimization in synthesis.

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.  Don’t forget about resource sharing and optimization in synthesis.

Accepted Answer

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

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 
      if (enable) E <= A * B; 
   end

Answer

wire [31:0] A, B, D; 
 reg [31:0] E, F, G; 
 always@(posedge clock) 
   begin 
      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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