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always_ff @(posedge clk_100mhz) begin
    if (ps2b_c[0] == 1'b0 && ps2b_c[1] == 1'b1) begin 
      if (ps2_valid == 1'b1 || ps2_code == 8'h00) begin 
        ps2_buffer[0] <= ps2_code;
        ps2_buffer[1] <= ps2_buffer[0];
        ps2_buffer[2] <= ps2_buffer[1];
        ps2_buffer[3] <= ps2_buffer[2];
      end else begin 
      end 
    end else begin 
    end 
  end