【文章內(nèi)容簡介】 0。//mid3 6,7: {high,med,low}=1239。b000000010000。//mid1 8,9: {high,med,low}=1239。b000000010000。//mid1 10,11: {high,med,low}=1239。b000000100000。//mid2 12,13: {high,med,low}=1239。b000000110000。//mid3 14,15: {high,med,low}=1239。b000000010000。//mid1 16,17: {high,med,low}=1239。b000000110000。//mid3 18,19: {high,med,low}=1239。b000001000000。//mid4 20,21,22,23: {high,med,low}=1239。b000001010000。//mid5 24,25: {high,med,low}=1239。b000000110000。//mid3 26,27: {high,med,low}=1239。b000001000000。//mid4 28,29,30,31: {high,med,low}=1239。b000001010000。//mid5 32: {high,med,low}=1239。b000001010000。//mid5 33: {high,med,low}=1239。b000001100000。//mid6 34: {high,med,low}=1239。b000001010000。//mid5 35: {high,med,low}=1239。b000001000000。//mid4 36,37: {high,med,low}=1239。b000000110000。//mid3 38,39: {high,med,low}=1239。b000000010000。//mid1 40: {high,med,low}=1239。b000001010000。//mid5 41: {high,med,low}=1239。b000001100000。//mid6 42: {high,med,low}=1239。b000001010000。//mid5 43: {high,med,low}=1239。b000001000000。//mid4 44,45: {high,med,low}=1239。b000000110000。//mid3 46,47: {high,med,low}=1239。b000000010000。//mid1 48,49: {high,med,low}=1239。b000000100000。//mid2 50,51: {high,med,low}=1239。b000000000101。//low5 52,53,54,55: {high,med,low}=1239。b000000010000。//mid1 56,56: {high,med,low}=1239。b000000100000。//mid2 57,58: {high,med,low}=1239。b000000000101。//low5 59,60,61,62,63: {high,med,low}=1239。b000000010000。//mid1 default : {high,med,low}=1239。bx。 endcase endendmodule//bell2子模塊《康定情歌》module bell2 (inclk,beep2)。 input inclk。 //系統(tǒng)時鐘output beep2。 //蜂鳴器輸出端reg [3:0]high,med,low。reg [15:0]origin。reg beep_r。 //寄存器reg [7:0]state。 reg [15:0]count。 assign beep2=beep_r。 //輸出音樂//時鐘頻率6MHzreg clk_6MHz。reg [2:0] t1。 always@(posedge inclk)begin if(t1339。d8) //8 t1=t1+339。b1。 else begin t1=339。b0。 clk_6MHz=~clk_6MHz。 endend//時鐘頻率4MHzreg clk_4Hz。reg [24:0] t2。 always@(posedge inclk)begin if(t22539。d13000000)//13000000 t2=t2+2539。b1。 else begin t2=2539。b0。 clk_4Hz=~clk_4Hz。 endendalways @(posedge clk_6MHz)begin count = count + 139。b1。 //計數(shù)器加1 if(count == origin) begin count = 1639。h0。 //計數(shù)器清零 beep_r = !beep_r。 //輸出取反 endendalways@(posedge clk_4Hz)begin case({high,med,low}) 39。b000000000001:origin=22900。 //低1 39。b000000000010:origin=20408。 //低2 39。b000000000011:origin=18181。 //低3 39。b000000000101:origin=15267。 //低5 39。b000000000110:origin=13605。 //低6 39。b000000000111:origin=11472。 //中1 39。b000000100000:origin=10216。 //中2 39。b000000110000:origin=9101。 //中3 39。b000001010000:origin=7653。 //中5 39。b000001100000:origin=6818。 //中6 39。b000100000000:origin=5733。 //高1 39。b001000000000:origin=5108。 //高2 39。b001100000000:origin=4551。 //高3 endcaseendalways @(posedge clk_4Hz) begin if(state ==103) state = 0。 else state = state + 1。 //《康定情歌》 case(state) 0,1: {high,med,low}=39。b000000110000。//中3 2,3: {high,med,low}=39。b000001010000。//中5 4,5: {high,med,low}=39。b000001100000。//中6 6: {high,med,low}=39。b000001100000。//中6 7: {high,med,low}=39。b000001010000。//中5 8,9,10: {high,med,low}=39。b000001100000。//中6 11: {high,med,low}=39。b000000110000。//中3 12,13,14,15: {high,med,low}=39。b000000100000。//中2 16,17: {high,med,low}=39。b000000110000。//中3 18,19: {high,med,low}=39。b000001010000。//中5 20,21: {high,med,low}=39。b000001100000。//中6 22: {high,med,low}=39。b000001100000。//中6 23: