基于FPGA的正弦发生器verilog源码 -

//sin_count_max=20,sin_f=1kz
module sin(clk,rst,sin_A,sin_B,sin_C);
input clk,rst;
output reg [11:0] sin_A,sin_B,sin_C;
reg [11:0] sin_A_r,sin_B_r,sin_C_r;
//get sinusoid addriess
reg [9:0] sin_add_A,sin_add_B,sin_add_C;
reg [11:0] sin_add_A_r,sin_add_B_r,sin_add_C_r;
reg sign_A,sign_B,sign_C; // 1 -- negtive; 0 -- positive
reg [9:0] count; // change from B9 to B10
//address of B/C phase delay after A phase //sinA = sin(wt)
parameter ADD_B_delay = 12'd1667; //2500 * 2/3 //sinB = sin(wt-2*pi/3)
parameter ADD_C_delay = 12'd833; //2500 * 1/3 //sinC = sin(wt+2*pi/3)
parameter ADD_MEM_MAX = 12'd624; //range of memory lookup address is: 0 -- 624 for this memory table.
parameter ADD_sin_1 = 12'd2499;//range of one sinusodal wave cycle address is: 0 -- 2499 for this memory table.
parameter ADD_sin_2 = 12'd625;
parameter ADD_sin_3 = 12'd1250;
parameter ADD_sin_4 = 12'd1875;
parameter DATA_MAX = 12'b111111111111; //max data value
parameter NEG_1 = {12{1'b1}}; //-1
always @ (posedge clk or negedge rst) begin
if (rst == 1'b0) begin
sin_add_A_r <= 12'b0;
sin_add_B_r <= ADD_B_delay;
sin_add_C_r <= ADD_C_delay;
count <= 10'b1;
sign_A <= 1'b0;
sign_B <= 1'b0;
sign_C <= 1'b0;
end
else begin
//genarate address
if ( count >= 20 ) begin
count <= 10'b1;
//update lookup table address
sin_add_A_r <= sin_add_A_r + 1'b1 ;
if (sin_add_A_r >= ADD_sin_1) begin
sin_add_A_r <= sin_add_A_r - ADD_sin_1;
end
sin_add_B_r<= sin_add_B_r + 1'b1;
if (sin_add_B_r >= ADD_sin_1) begin
sin_add_B_r <= sin_add_B_r - ADD_sin_1;
end
sin_add_C_r<= sin_add_C_r + 1'b1 ;
if (sin_add_C_r >= ADD_sin_1) begin
sin_add_C_r <= sin_add_C_r - ADD_sin_1;
end
//generate address A
if((sin_add_A_r >= 0) && (sin_add_A_r < ADD_sin_2))begin
sin_add_A <= sin_add_A_r[9:0];
sign_A <= 1'b0;
end
else if((sin_add_A_r>= ADD_sin_2) && (sin_add_A_r < ADD_sin_3)) begin
sin_add_A <= ADD_sin_3 - sin_add_A_r - 1'b1;
sign_A <= 1'b0;
end
else if((sin_add_A_r >= ADD_sin_3) && (sin_add_A_r < ADD_sin_4)) begin
sin_add_A <= sin_add_A_r - ADD_sin_3;
sign_A <= 1'b1;
end
else if((sin_add_A_r >= ADD_sin_4) && (sin_add_A_r <= ADD_sin_1))begin
sin_add_A <= ADD_sin_1 - sin_add_A_r;
sign_A <= 1'b1;
end
//get data A
if(sign_A == 1'b1) begin
sin_A <= ~sin_A_r + 1'b1 ;
end
else begin
sin_A <= sin_A_r;
end
//generate address B
if((sin_add_B_r >= 0) && (sin_add_B_r < ADD_sin_2))begin
sin_add_B <= sin_add_B_r[9:0];
sign_B <= 1'b0;
end
else if((sin_add_B_r >= ADD_sin_2) && (sin_add_B_r < ADD_sin_3)) begin
sin_add_B <= ADD_sin_3 - sin_add_B_r - 1'b1;
sign_B <= 1'b0;
end
else if((sin_add_B_r >= ADD_sin_3) && (sin_add_B_r < ADD_sin_4)) begin
sin_add_B <= sin_add_B_r - ADD_sin_3;
sign_B <= 1'b1;
end
else if((sin_add_B_r >= ADD_sin_4) && (sin_add_B_r <= ADD_sin_1))begin
sin_add_B <= ADD_sin_1- sin_add_B_r;
sign_B <= 1'b1;
end
//get data B
if(sign_B == 1'b1) begin
sin_B <= ~sin_B_r+ 1'b1 ;
end
else begin
sin_B <= sin_B_r;
end
//generate address C
if((sin_add_C_r >= 0) && (sin_add_C_r < ADD_sin_2))begin
sin_add_C <= sin_add_C_r[9:0];
sign_C <= 1'b0;
end
else if((sin_add_C_r >= ADD_sin_2) && (sin_add_C_r < ADD_sin_3)) begin
sin_add_C <= ADD_sin_3 - sin_add_C_r - 1'b1;
sign_C <= 1'b0;
end
else if((sin_add_C_r >= ADD_sin_3) && (sin_add_C_r < ADD_sin_4)) begin
sin_add_C <= sin_add_C_r - ADD_sin_3;
sign_C <= 1'b1;
end
else if((sin_add_C_r >= ADD_sin_4) && (sin_add_C_r<= ADD_sin_1))begin
sin_add_C <= ADD_sin_1 - sin_add_C_r;
sign_C <= 1'b1;
end
//get data C
if(sign_C == 1'b1) begin
sin_C <= ~sin_C_r + 1'b1 ;
end
else begin
sin_C <= sin_C_r;
end
end
else begin
count <= count + 1'b1;
end
end
end
// Parallel to serial
// use 3 phase pipeline
reg [9:0] add;
wire [11:0] sin;
reg [2:0] sel;
always @ ( posedge clk or negedge rst)begin
if( rst == 1'b0 )begin
sel <= 3'b001;
sin_A_r <= 12'b0;
sin_B_r <= 12'b0;
sin_C_r <= 12'b0;
add <= 10'b0;
end
else begin
sel <= {sel[1],sel[0],sel[2]};
case (sel)
3'b001: begin
add <= sin_add_A;
sin_A_r <= sin;
end
3'b010: begin
add <= sin_add_B;
sin_B_r <= sin;
end
3'b100: begin
add <= sin_add_C;
sin_C_r <= sin;
end
default: begin
sel <= 3'b001;
end
endcase
end
end
sintalbe625 sintalbe625A_inst (
.address ( add ),
.clock ( clk ),
.q ( sin )
);
endmodule

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