• 0
Shruthi

LMS algorithm using output from XADC

Question

Hello all,

I'm trying to simulate LMS algorithm with digital samples from XADC out of Auxillary channel 6.

In my step to update weight, I don't understand how to bring about weight update. It reads Weight_in and Weight_out as XXXX.

 

Please check the bolded. area in LMS_weight module.

 

***********************

module LMShruthi ( DCLK, RESET, Desired_in, mux ); 
input DCLK, RESET;
input   signed [15:0] Desired_in; 
output signed [15:0] mux; 
 
wire [15:0] mu; //mu=0.0000001
reg signed [15:0] Data_in; 
wire signed [15:0] e;
wire signed [31:0] Product_32, y; 
 
assign mu  = 16'b0000000001100110;   
 
always # (50000) Data_in = Desired_in;
 
assign Product_32 = mu * Data_in; 
 
    assign mux = Product_32[24:9];
 
LMS_weight uut3   ( .DCLK(DCLK), .RESET(RESET), .Data_in(Data_in), .mux(mux), .y(y) ); 
 
    assign e = Desired_in - y[24:9];  
    
endmodule 
 
***********************************************************
module LMS_weight (DCLK, RESET, Data_in, mux, y); 
    
    input DCLK,RESET;
    input signed [15:0] Data_in,mux; 
    output  signed [31:0] y; 
 
 
    wire signed [15:0] Weight_in;
    wire signed [15:0] Weight_out, emux; 
    wire signed [31:0] Product_32; 
 
    assign Product_32 = Data_in * mux; 
    assign emux = Product_32[26:11]; 
 
    assign Weight_in = (RESET==1'b1) ? 16'h0000 : (emux + Weight_out);
             
    assign y = Weight_out * Data_in; 
    
endmodule 
***********************************************************

Thank you,

Shruthi Sampathkumar.

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Well, for a start, nothing in there looks to be clocked at all.

Without using a clock somewhere, you can't update any internal state.

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