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module ex9(CLOCK_50, KEY, HEX0, HEX1, HEX2, LEDR);
input CLOCK_50;
input [3:0] KEY;
output [9:0] LEDR;
output [6:0] HEX0, HEX1, HEX2;
wire tick_ms, tick_hs, time_out, start_delay, en_lfsr;
wire [6:0] N;
wire [6:0] bcd_to_hex;
wire[3:0] BCD_0, BCD_1, BCD_2, BCD_3, BCD_4;
tick_50000 TICK0(CLOCK_50, tick_ms);
tick_2500 TICK1(CLOCK_50, tick_ms, tick_hs);
formula_fsm FSM(tick_ms, tick_hs, ~KEY[3], time_out, en_lfsr, start_delay, LEDR);
LFSR LFSR0(tick_ms, en_lfsr, N);
delay DEL0(tick_ms, N, start_delay, time_out);
bin2bcd_16 BCD(N, BCD_0, BCD_1, BCD_2, BCD_3, BCD_4);
hex_to_7seg SEG0(HEX0, BCD_0);
hex_to_7seg SEG1(HEX1, BCD_1);
hex_to_7seg SEG2(HEX2, BCD_2);
endmodule
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