Estoy usando un FPGA (BEMICROMAX10) para crear un reloj digital con siete pantallas de segmento en una placa de pruebas, y tengo problemas para obtener los segundos para contar exactamente 1 segundo. La entrada del sistema de reloj que estoy usando es de 50 MHz. Voy a publicar sólo el código relevante a los segundos. La ecuación que utilicé para determinar N fue (1/50000000) * 2 ^ N = 1 que me dio 25.58, así que cuando uso 26, es un poco lento, y cuando lo hago con 25, es un poco demasiado rápido. ¿Alguna idea de cómo corregir esto?
Gracias
module digital_clock(clk, segsec);
input clk;
output [13:0] segsec;
parameter N = 25;
reg [N-1:0] slow_clk = 0;
reg [7:0] countsec = 0;
always @ (posedge clk)
slow_clk <= slow_clk + 1'b1;
always @ (posedge slow_clk[N-1])
if (countsec == 8'b00111011) countsec <= 8'b0;
else countsec <= countsec + 8'b1;
assign segsec = (countsec == 8'h0 ) ? 16'b01111110111111:
(countsec == 8'h1) ? 16'b01111110000110: //1 0000110 0111111
(countsec == 8'h2) ? 16'b01111111011011: //2 1011011
(countsec == 8'h3) ? 16'b01111111001111: //3 1001111
(countsec == 8'h4) ? 16'b01111111100110: //4 1100110
(countsec == 8'h5) ? 16'b01111111101101: //5 1101101
(countsec == 8'h6) ? 16'b01111111111101: //6 1111101
(countsec == 8'h7) ? 16'b01111110000111: //7 0000111
(countsec == 8'h8) ? 16'b01111111111111: //8 1111111
(countsec == 8'h9) ? 16'b01111111101111: //9 1101111
(countsec == 8'ha) ? 16'b00001100111111: //10
(countsec == 8'hb) ? 16'b00001100000110://11
(countsec == 8'hc) ? 16'b00001101011011://12
(countsec == 8'hd) ? 16'b00001101001111://13
(countsec == 8'he) ? 16'b00001101100110: //14
(countsec == 8'hf) ? 16'b00001101101101: //15
(countsec == 8'h10) ? 16'b00001101111101://16
(countsec == 8'h11) ? 16'b00001100000111://17
(countsec == 8'h12) ? 16'b00001101111111://18
(countsec == 8'h13) ? 16'b00001101101111://19
(countsec == 8'h14) ? 16'b10110110111111://20
(countsec == 8'h15) ? 16'b10110110000110://21
(countsec == 8'h16) ? 16'b10110111011011://22
(countsec == 8'h17) ? 16'b10110111001111://23
(countsec == 8'h18) ? 16'b10110111100110://24
(countsec == 8'h19) ? 16'b10110111101101://25
(countsec == 8'h1a) ? 16'b10110111111101://26
(countsec == 8'h1b) ? 16'b10110110000111://27
(countsec == 8'h1c) ? 16'b10110111111111://28
(countsec == 8'h1d) ? 16'b10110111101111://29
(countsec == 8'h1e) ? 16'b10011110111111://30
(countsec == 8'h1f) ? 16'b10011110000110://31
(countsec == 8'h20) ? 16'b10011111011011://32
(countsec == 8'h21) ? 16'b10011111001111://33
(countsec == 8'h22) ? 16'b10011111100110://34
(countsec == 8'h23) ? 16'b10011111101101://35
(countsec == 8'h24) ? 16'b10011111111101://36
(countsec == 8'h25) ? 16'b10011110000111://37
(countsec == 8'h26) ? 16'b10011111111111://38
(countsec == 8'h27) ? 16'b10011111101111://39
(countsec == 8'h28) ? 16'b11001100111111://40
(countsec == 8'h29) ? 16'b11001100000110://41
(countsec == 8'h2a) ? 16'b11001101011011://42
(countsec == 8'h2b) ? 16'b11001101001111://43
(countsec == 8'h2c) ? 16'b11001101100110://44
(countsec == 8'h2d) ? 16'b11001101101101://45
(countsec == 8'h2e) ? 16'b11001101111101://46
(countsec == 8'h2f) ? 16'b11001100000111://47
(countsec == 8'h30) ? 16'b11001101111111://48
(countsec == 8'h31) ? 16'b11001101101111://49
(countsec == 8'h32) ? 16'b11011010111111://50
(countsec == 8'h33) ? 16'b11011010000110://51
(countsec == 8'h34) ? 16'b11011011011011://52
(countsec == 8'h35) ? 16'b11011011001111://53
(countsec == 8'h36) ? 16'b11011011100110://54
(countsec == 8'h37) ? 16'b11011011101101://55
(countsec == 8'h38) ? 16'b11011011111101://56
(countsec == 8'h39) ? 16'b11011010000111://57
(countsec == 8'h3a) ? 16'b11011011111111://58
(countsec == 8'h3b) ? 16'b11011011101111://59
16'b01111110111111;
endmodule