repo2/atari_chips/pokeyv2/sigma_delta/cic_comb.sv
| 1454 | markw | // Dave Muscle
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//Decimator designed for use in a multi-stage CIC filter
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/*
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x[n] --|---------> + ----> y[n]
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| x (-1)
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---[z^-1]-->|
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*/
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module cic_comb #(
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parameter int WIDTH = 32
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)(
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input bit clk,
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input bit rst,
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input bit ena,
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input bit [WIDTH-1:0] data_in ,
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output bit [WIDTH-1:0] data_out
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);
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bit [WIDTH-1:0] r_data;
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always_ff @(posedge clk) begin
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if(ena) begin
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r_data <= data_in ;
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data_out <= r_data - data_in ;
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end
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if(rst) begin
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data_out <= 0;
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r_data <= 0;
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end
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end
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endmodule: cic_comb
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