I am trying to take the average of 8 8-bit registers. I was able to do it structurally, by having four 8-> 9-bit adders, two 9-> 10 bit adder, and one 10-> 11-bit adder. This works correctly; however, I was curious if there is a better way/ more efficient way to do this.
For the structural way, all I have to do is have the assign a wire from the 10->11 bit adder to the output.
I'm trying to do something like below, but it says
Index <10> is out of range [7:0] for signal . I have it index 10, in case all the registers are large like 255.
module avg(
num_in,
clk,
rs,
ave8
) ;
input clk ;
input rs;
input [7:0] num_in ;
output [7:0] ave8 ;
reg [7:0] registers [7:0] ;
always @(posedge clk) begin
if(rs) begin
registers[0] <= 0;
registers[1] <= 0;
registers[2] <= 0;
registers[3] <= 0;
registers[4] <= 0;
registers[5] <= 0;
registers[6] <= 0;
registers[7] <= 0;
end
registers[0] <= num_in;
registers[1] <= registers[0];
registers[2] <= registers[1];
registers[3] <= registers[2];
registers[4] <= registers[3];
registers[5] <= registers[4];
registers[6] <= registers[5];
registers[7] <= registers[6];
end
// This assign function is what I am focused on.
assign ave8 = {registers[0] + registers[1] + registers[2] + registers[3] + registers[4] + registers[5] + registers[6] + registers[7]}[10:3];
One way is to create a sum wire:
wire [10:0] sum = registers[0] + registers[1] + registers[2] + registers[3] + registers[4] + registers[5] + registers[6] + registers[7];
assign ave8 = sum[10:3];