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// This module generates the "random" sequences for the simon game.
// This module uses a perpetually running LFSR for seeding the sequence generator.
// If randomize is high this module will use the current LFSR value as the seed.
// Effectively this results in choosing a new random sequence.
// If start_over is high this module moves to the start of the random sequence.
// If next is high this module moves to the next element of the sequence.
// seq outputs the current element of the sequence using a one-hot encoding.
module sequence_generator (
input clk,
input randomize,
input next,
input start_over,
output [7:0] seq
);
reg [17:0] counter = 18'b100110101011010111;
reg [17:0] seed;
reg [17:0] current;
assign seq = 8'b1 << current[2:0];
always @(posedge clk) begin
counter <= {counter[15:0], counter[17:16] ^ counter[10:9]};
if (randomize)
seed <= counter;
if (start_over)
current <= seed;
else if (next)
current <= {current[15:0], current[17:16] ^ current[10:9]};
end
endmodule
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