always_comb LED <= clk_2;

  logic reset;
  always_comb reset <= SWI[0];

  logic [NBITS_TOP-1:0] a,b,c,d,e;
  always_ff @(posedge clk_2)
    if(reset) begin
      a <= 0;
      b <= 1;
      c <= 2;
      d <= 3;
      e <= 4;
    end else begin
      e <= e+1;
      d <= d+e;
      c <= c+d;
      b <= b+c;
      a <= a+b;
    end

  always_comb begin
    lcd_SrcA      <= a;
    lcd_SrcB      <= b;
    lcd_ALUResult <= c;
    lcd_Result    <= d;
    lcd_ReadData  <= e;
  end

/* No simulador, coloque o clock em 2 segundos.
   Use o botão de reset (SWI[0]) para iniciar.

Oara implementar em FPGA, substitue parte da instanciação do lcd dentro do DE0_*.sv

------------------ no lugar de:
parameter NBITS_LCD = 64;
logic [NBITS_LCD-1:0] lcd_a, lcd_b;

top (.clk_2(CLOCK_DIV), .SWI(SWI), .LED(LED), .SEG(SEG), .lcd_a(lcd_a), .lcd_b(lcd_b));

lcd_64bit (.clk(CLOCK_50), .reset(~KEY[0]),
           .a(lcd_a), .b(lcd_b),
------------------ coloque:
parameter NBITS = 8;
logic [NBITS-1:0] a,b,c,d,e;

top (.clk_2(CLOCK_DIV), .SWI(SWI), .LED(LED), .SEG(SEG), 
     .lcd_SrcA(a), .lcd_SrcB(b), .lcd_ALUResult(c), .lcd_Result(d), .lcd_ReadData(e) );

lcd (.clk(CLOCK_50), .reset(~KEY[0]),
     .d2a(a), .d2b(b), .d2c(c), .d2d(d), .d2e(e),
------------------
*/