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P. 147
if(!reset) begin tone_cnt<=0; spk<=0; end
else if(warning_sig==1) begin
if(tone_cnt>=tone[addr]) begin tone_cnt<=0; spk<=~spk; end
else tone_cnt<=tone_cnt+1;
end
else begin tone_cnt<=0; spk<=0; end
end
always @(posedge clk, negedge reset) begin
if(!reset) begin tempo_cnt<=0; addr<=0; end
else if(warning_sig==1) begin
if(tempo_cnt>=tempo) begin
tempo_cnt<=0; addr<=addr+1;
end
else tempo_cnt<=tempo_cnt+1;
end
else begin tempo_cnt<=0; addr<=0; end
end
endmodule
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