add flipflop

flip_flop/flip_flop.v

@@ -0,0 +1,17 @@
+/*
+    Flip-Flop D y registro
+*/
+
+module register #(parameter N = 8)(
+    input clk,
+    input rst,
+    input en,
+    input [N-1:0] d,
+    output reg [N-1:0] q
+);
+    always @(posedge clk or posedge rst) begin
+        if (rst) q <= 0;
+        else if (en) q <= d;
+    end
+
+endmodule

flip_flop/flip_flop_tb.v

@@ -0,0 +1,52 @@
+/*
+    Flip-Flop D y registro
+*/
+`include "./flip_flop/flip_flop.v"
+
+module register_tb;
+    reg clk, rst, en;
+    reg [7:0] d;
+    wire [7:0] q;
+
+    register #(.N(8)) dut (
+        .clk(clk),
+        .rst(rst),
+        .en(en),
+        .d(d),
+        .q(q)
+    );
+
+    initial clk = 0;
+    always #5 clk = ~clk;
+
+    initial begin
+        $dumpfile("./flip_flop/flip_flop.vcd");
+        $dumpvars(0, register_tb);
+
+        rst = 1; en = 0; d = 0;
+        @(posedge clk); #1
+
+        rst = 0;
+        @(posedge clk); #1
+        $display("rst=0, en=0, d=%0d, q=%0d (q no cambia)", d, q);
+
+        en = 1; d = 8'd42;
+        @(posedge clk); #1
+        $display("en=1, d=42 → q=%0d", q);
+
+        d = 8'd99;
+        @(posedge clk); #1
+        $display("en=1, d=99 → q=%0d", q);
+
+        en = 0; d = 8'd7;
+        @(posedge clk); #1
+        $display("en=0, d=7  → q=%0d (q mantiene 99)", q);
+
+        rst = 1;
+        @(posedge clk); #1
+        $display("rst=1      → q=%0d (q=0)", q);
+
+        $finish;
+    end
+
+endmodule