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signal_generator.v
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module signal_generator(CLOCK_50,
signal);
input CLOCK_50;
output [15:0] signal;
//Signal generator elements
reg [7:0] sinAddr = 0;
reg [15:0] sine;
//Variables to hold captured values
reg [15:0] signal; //vector with values of ROM
//Variables for FM generation
integer edge_cnt = 0;
reg [7:0] count = 8'd2;
integer tgrid_count=0;//
integer tgrid1=175;//T1 for frequency function change
parameter integer fgridcount = 320;//Symbol duration for pulse
integer flipped = 0;//Phase shifter
always@(posedge CLOCK_50)
begin
signal <= sine;
sinAddr <= sinAddr + count;
if(tgrid_count>(fgridcount+319))
begin
tgrid_count = 0;
edge_cnt = 0;
flipped = 0;
count = 8'd2;
sinAddr <= 8'd0;
end
else if(tgrid_count>fgridcount)
begin
sinAddr <= 8'd0;
count = 8'd0;
end
else
begin
if (tgrid_count>tgrid1 && flipped==0)
begin
count = 8'd6;
sinAddr <= 8'd64;
flipped = 1;
end
if(edge_cnt == 150)
begin
edge_cnt = 0;
if(count<=8'd4)
begin
count <= count+8'd2;
end
else if (count>8'd4)
begin
count <= count+8'd4;
end
end
edge_cnt = edge_cnt + 1;
end
tgrid_count=tgrid_count+1;
end
//Sin Wave ROM Table
always@(sinAddr)
begin
case(sinAddr)
8'd0: sine = 16'd32768 ;
8'd1: sine = 16'd33572 ;
8'd2: sine = 16'd34376 ;
8'd3: sine = 16'd35179 ;
8'd4: sine = 16'd35980 ;
8'd5: sine = 16'd36779 ;
8'd6: sine = 16'd37576 ;
8'd7: sine = 16'd38370 ;
8'd8: sine = 16'd39161;
8'd9: sine = 16'd39948 ;
8'd10: sine = 16'd40730 ;
8'd11: sine = 16'd41508 ;
8'd12: sine = 16'd42280 ;
8'd13: sine = 16'd43047 ;
8'd14: sine = 16'd43807 ;
8'd15: sine = 16'd44561 ;
8'd16: sine = 16'd45308 ;
8'd17: sine = 16'd46047 ;
8'd18: sine = 16'd46778 ;
8'd19: sine = 16'd47501;
8'd20: sine = 16'd48215;
8'd21: sine = 16'd48919 ;
8'd22: sine = 16'd49614 ;
8'd23: sine = 16'd50299 ;
8'd24: sine = 16'd50973 ;
8'd25: sine = 16'd51636 ;
8'd26: sine = 16'd52288 ;
8'd27: sine = 16'd52928 ;
8'd28: sine = 16'd53556 ;
8'd29: sine = 16'd54171 ;
8'd30: sine = 16'd54774 ;
8'd31: sine = 16'd55363 ;
8'd32: sine = 16'd55938;
8'd33: sine = 16'd56500 ;
8'd34: sine = 16'd57047 ;
8'd35: sine = 16'd57580 ;
8'd36: sine = 16'd58098 ;
8'd37: sine = 16'd58601 ;
8'd38: sine = 16'd59088 ;
8'd39: sine = 16'd59559 ;
8'd40: sine = 16'd60014;
8'd41: sine = 16'd60452 ;
8'd42: sine = 16'd60874 ;
8'd43: sine = 16'd61279;
8'd44: sine = 16'd61667;
8'd45: sine = 16'd62037 ;
8'd46: sine = 16'd62390 ;
8'd47: sine = 16'd62725 ;
8'd48: sine = 16'd63042 ;
8'd49: sine = 16'd63340 ;
8'd50: sine = 16'd63621 ;
8'd51: sine = 16'd63882 ;
8'd52: sine = 16'd64125 ;
8'd53: sine = 16'd64349 ;
8'd54: sine = 16'd64554 ;
8'd55: sine = 16'd64740 ;
8'd56: sine = 16'd64906;
8'd57: sine = 16'd65054 ;
8'd58: sine = 16'd65181 ;
8'd59: sine = 16'd65290 ;
8'd60: sine = 16'd65378 ;
8'd61: sine = 16'd65447 ;
8'd62: sine = 16'd65497 ;
8'd63: sine = 16'd65526 ;
8'd64: sine = 16'd65535 ;
8'd65: sine = 16'd65526 ;
8'd66: sine = 16'd65497 ;
8'd67: sine = 16'd65447;
8'd68: sine = 16'd65378;
8'd69: sine = 16'd65290 ;
8'd70: sine = 16'd65181 ;
8'd71: sine = 16'd65054 ;
8'd72: sine = 16'd64906 ;
8'd73: sine = 16'd64740 ;
8'd74: sine = 16'd64554 ;
8'd75: sine = 16'd64349 ;
8'd76: sine = 16'd64125 ;
8'd77: sine = 16'd63882 ;
8'd78: sine = 16'd63621 ;
8'd79: sine = 16'd63340 ;
8'd80: sine = 16'd63042;
8'd81: sine = 16'd62725;
8'd82: sine = 16'd62390 ;
8'd83: sine = 16'd62037 ;
8'd84: sine = 16'd61667 ;
8'd85: sine = 16'd61279 ;
8'd86: sine = 16'd60874 ;
8'd87: sine = 16'd60452 ;
8'd88: sine = 16'd60014;
8'd89: sine = 16'd59559 ;
8'd90: sine = 16'd59088 ;
8'd91: sine = 16'd58601;
8'd92: sine = 16'd58098;
8'd93: sine = 16'd57580;
8'd94: sine = 16'd57047 ;
8'd95: sine = 16'd56500 ;
8'd96: sine = 16'd55938 ;
8'd97: sine = 16'd55363 ;
8'd98: sine = 16'd54774 ;
8'd99: sine = 16'd54171 ;
8'd100: sine =16'd53556 ;
8'd101: sine =16'd52928 ;
8'd102: sine =16'd52288 ;
8'd103: sine =16'd51636 ;
8'd104: sine =16'd50973;
8'd105: sine =16'd50299 ;
8'd106: sine =16'd49614 ;
8'd107: sine = 16'd48919 ;
8'd108: sine = 16'd48215 ;
8'd109: sine = 16'd47501 ;
8'd110: sine = 16'd46778 ;
8'd111: sine = 16'd46047 ;
8'd112: sine = 16'd45308 ;
8'd113: sine = 16'd44561 ;
8'd114: sine = 16'd43807 ;
8'd115: sine = 16'd43047;
8'd116: sine = 16'd42280;
8'd117: sine = 16'd41508 ;
8'd118: sine = 16'd40730 ;
8'd119: sine = 16'd39948 ;
8'd120: sine = 16'd39161 ;
8'd121: sine = 16'd38370 ;
8'd122: sine = 16'd37576 ;
8'd123: sine = 16'd36779 ;
8'd124: sine = 16'd35980 ;
8'd125: sine = 16'd35179 ;
8'd126: sine = 16'd34376 ;
8'd127: sine = 16'd33572 ;
8'd128: sine = 16'd32768;
8'd129: sine = 16'd31964 ;
8'd130: sine = 16'd31160 ;
8'd131: sine = 16'd30357 ;
8'd132: sine = 16'd29556 ;
8'd133: sine = 16'd28757 ;
8'd134: sine = 16'd27960 ;
8'd135: sine = 16'd27166 ;
8'd136: sine = 16'd26375;
8'd137: sine = 16'd25588 ;
8'd138: sine = 16'd24806 ;
8'd139: sine = 16'd24028;
8'd140: sine = 16'd23256;
8'd141: sine = 16'd22489 ;
8'd142: sine = 16'd21729 ;
8'd143: sine = 16'd20975 ;
8'd144: sine = 16'd20228 ;
8'd145: sine = 16'd19489 ;
8'd146: sine = 16'd18758 ;
8'd147: sine = 16'd18035 ;
8'd148: sine = 16'd17321 ;
8'd149: sine = 16'd16617 ;
8'd150: sine = 16'd15922 ;
8'd151: sine = 16'd15237 ;
8'd152: sine = 16'd14563;
8'd153: sine = 16'd13900 ;
8'd154: sine = 16'd13248 ;
8'd155: sine = 16'd12608 ;
8'd156: sine = 16'd11980 ;
8'd157: sine = 16'd11365 ;
8'd158: sine = 16'd10762 ;
8'd159: sine = 16'd10173 ;
8'd160: sine = 16'd9598 ;
8'd161: sine = 16'd9036 ;
8'd162: sine = 16'd8489 ;
8'd163: sine = 16'd7956;
8'd164: sine = 16'd7438;
8'd165: sine = 16'd6935 ;
8'd166: sine = 16'd6448 ;
8'd167: sine = 16'd5977 ;
8'd168: sine = 16'd5522 ;
8'd169: sine = 16'd5084 ;
8'd170: sine = 16'd4662 ;
8'd171: sine = 16'd4257 ;
8'd172: sine = 16'd3869 ;
8'd173: sine = 16'd3499 ;
8'd174: sine = 16'd3146 ;
8'd175: sine = 16'd2811 ;
8'd176: sine = 16'd2494;
8'd177: sine = 16'd2196;
8'd178: sine = 16'd1915 ;
8'd179: sine = 16'd1654 ;
8'd180: sine = 16'd1411 ;
8'd181: sine = 16'd1187 ;
8'd182: sine = 16'd982 ;
8'd183: sine = 16'd796 ;
8'd184: sine = 16'd630;
8'd185: sine = 16'd482 ;
8'd186: sine = 16'd355 ;
8'd187: sine = 16'd246;
8'd188: sine = 16'd158;
8'd189: sine = 16'd89;
8'd190: sine = 16'd39 ;
8'd191: sine = 16'd10 ;
8'd192: sine = 16'd0 ;
8'd193: sine = 16'd10 ;
8'd194: sine = 16'd39 ;
8'd195: sine = 16'd89 ;
8'd196: sine = 16'd158 ;
8'd197: sine = 16'd246 ;
8'd198: sine = 16'd355 ;
8'd199: sine = 16'd482 ;
8'd200: sine = 16'd630;
8'd201: sine = 16'd796 ;
8'd202: sine = 16'd982 ;
8'd203: sine = 16'd1187 ;
8'd204: sine = 16'd1411 ;
8'd205: sine = 16'd1654 ;
8'd206: sine = 16'd1915 ;
8'd207: sine = 16'd2196 ;
8'd208: sine = 16'd2494 ;
8'd209: sine = 16'd2811 ;
8'd210: sine = 16'd3146 ;
8'd211: sine = 16'd3499;
8'd212: sine = 16'd3869;
8'd213: sine = 16'd4257 ;
8'd214: sine = 16'd4662 ;
8'd215: sine = 16'd5084 ;
8'd216: sine = 16'd5522 ;
8'd217: sine = 16'd5977 ;
8'd218: sine = 16'd6448 ;
8'd219: sine = 16'd6935;
8'd220: sine = 16'd7438 ;
8'd221: sine = 16'd7956 ;
8'd222: sine = 16'd8489 ;
8'd223: sine = 16'd9036 ;
8'd224: sine = 16'd9598;
8'd225: sine = 16'd10173 ;
8'd226: sine = 16'd10762;
8'd227: sine = 16'd11365 ;
8'd228: sine = 16'd11980 ;
8'd229: sine = 16'd12608 ;
8'd230: sine = 16'd13248 ;
8'd231: sine = 16'd13900 ;
8'd232: sine = 16'd14563;
8'd233: sine = 16'd15237 ;
8'd234: sine = 16'd15922 ;
8'd235: sine = 16'd16617;
8'd236: sine = 16'd17321;
8'd237: sine = 16'd18035 ;
8'd238: sine = 16'd18758 ;
8'd239: sine = 16'd19489 ;
8'd240: sine = 16'd20228 ;
8'd241: sine = 16'd20975 ;
8'd242: sine = 16'd21729 ;
8'd243: sine = 16'd22489 ;
8'd244: sine = 16'd23256 ;
8'd245: sine = 16'd24028 ;
8'd246: sine = 16'd24806 ;
8'd247: sine = 16'd25588 ;
8'd248: sine = 16'd26375;
8'd249: sine = 16'd27166 ;
8'd250: sine = 16'd27960 ;
8'd251: sine = 16'd28757 ;
8'd252: sine = 16'd29556 ;
8'd253: sine = 16'd30357 ;
8'd254: sine = 16'd31160 ;
8'd255: sine = 16'd31964 ;
default: sine = 16'd0;
endcase
end
endmodule