// Diseño: code
// Descripción: Cerradura digital con cuatro botones y una salida.
// Autor: Jorge Juan-Chico <jjchico@dte.us.es>
// Copyright Universidad de Sevilla, Spain
// Fecha original: 14-12-2011
//Este archivo describe una cerradura digital simple. El sistema tiene
//cuatro entradas (b0, b1, b2 y b3) y una salida (z). La salida se activa (1)
//cuando las entradas se activan (1) en la secuencia: b0, b2, b1.
//La secuencia de pulsaciones correcta puede empezar en cualquier momento.
//Cuando la salida está activa (la cerradura está abierta) la pulsación de
//cualquier botón (excepto b1, que es la última cifrea de la secuencia,
//lleva al sistema al estado inicial en que se cierrar la cerradura.
//El sistema disponde de una señal de puesta a cero asíncrona activa en nivel
//alto que lleva al sistema al estado inicial.
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////
// Cerradura digital //
//////////////////////////////////////////////////////////////////////////
module code(
input wire clk, // reloj
input wire reset, // puesta a cero
input wire [3:0] b, // botones de entrada
output reg z // salida
);
// Codificación de estados (ejemplo)
parameter [2:0]
D1_PRESS = 3'b000, // esperando pulsar primera cifra (b0)
D1_REL = 3'b001, // esperando soltar primera cifra (b0)
D2_PRESS = 3'b010, // esperando pulsar segunda cifra (b2)
D2_REL = 3'b011, // esperando soltar segunda cifra (b2)
D3_PRESS = 3'b100, // esperando pulsar tercera cifra (b1)
D3_REL = 3'b101, // esperando soltar tercera cifra (b1)
OPEN = 3'b110; // puerta abierta
// Variables de estado y próximo estado
reg [2:0] state, next_state;
// Proceso de cambio de estado (secuencial)
always @(posedge clk, posedge reset)
if (reset)
state <= D1_PRESS;
else
state <= next_state;
// Cálculo del próximo estado (combinacional)
always @* begin
next_state = 3'bxxx;
case (state)
D1_PRESS: // esperamos que se pulse (press)
if (b == 4'b0001) // el botón 0
next_state = D1_REL;
else
next_state = D1_PRESS;
D1_REL: // esperamos que se suelte (release)
if (b == 4'b0001) // el botón 0
next_state = D1_REL;
else if (b == 4'b0000)
next_state = D2_PRESS;
else
next_state = D1_PRESS;
D2_PRESS:
if (b == 4'b0100)
next_state = D2_REL;
else
next_state = D1_PRESS;
D2_REL:
if (b == 4'b0000)
next_state = D3_PRESS;
else if (b == 4'b0100)
next_state = D2_REL;
else
next_STATE = D1_PRESS;
D3_PRESS:
if (b == 4'b0010)
next_state = D3_REL;
else
next_state = D1_PRESS;
D3_REL:
if (b == 4'b0000)
next_state = OPEN;
else if (b == 4'b0010)
next_state = D3_PRESS;
else
next_state = D1_PRESS;
OPEN:
if (b == 4'b0000)
next_state = OPEN;
else
next_state = D1_PRESS;
endcase
end
// Proceso de cálculo de la salida (combinacional)
always @(clk) begin
if (next_state == open)
z <= 1
else
z <= 0
end
endmodule // code
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