factor_rom_q.v

基于VHDL语言的一个FFT快速傅里叶变换程序采用4蝶形算法

module	factor_rom_Q
(
	clk,
	addr,
	data
);

input				clk;
input	[5:0]		addr;

output	[15:0]		data;
	
reg		[15:0]		data;

function	[15:0]		romout;
	input	[5:0]		addr;
// 1位整数,14位小数
	case (addr)
		 0 : romout = 16'h0000;
		 1 : romout = 16'hFE6E;
		 2 : romout = 16'hFCDD;
		 3 : romout = 16'hFB4B;
		 4 : romout = 16'hF9BB;
		 5 : romout = 16'hF82B;
		 6 : romout = 16'hF69C;
		 7 : romout = 16'hF50F;
		 8 : romout = 16'hF384;
		 9 : romout = 16'hF1FB;
		10 : romout = 16'hF074;
		11 : romout = 16'hEEEF;
		12 : romout = 16'hED6C;
		13 : romout = 16'hEBED;
		14 : romout = 16'hEA71;
		15 : romout = 16'hE8F8;
		16 : romout = 16'hE783;
		17 : romout = 16'hE611;
		18 : romout = 16'hE4A3;
		19 : romout = 16'hE33A;
		20 : romout = 16'hE1D5;
		21 : romout = 16'hE075;
		22 : romout = 16'hDF19;
		23 : romout = 16'hDDC3;
		24 : romout = 16'hDC72;
		25 : romout = 16'hDB26;
		26 : romout = 16'hD9E1;
		27 : romout = 16'hD8A1;
		28 : romout = 16'hD767;
		29 : romout = 16'hD633;
		30 : romout = 16'hD506;
		31 : romout = 16'hD3DF;
		32 : romout = 16'hD2BF;
		33 : romout = 16'hD1A6;
		34 : romout = 16'hD095;
		35 : romout = 16'hCF8A;
		36 : romout = 16'hCE87;
		37 : romout = 16'hCD8C;
		38 : romout = 16'hCC99;
		39 : romout = 16'hCBAD;
		40 : romout = 16'hCACA;
		41 : romout = 16'hC9EE;
		42 : romout = 16'hC91B;
		43 : romout = 16'hC851;
		44 : romout = 16'hC78F;
		45 : romout = 16'hC6D6;
		46 : romout = 16'hC626;
		47 : romout = 16'hC57E;
		48 : romout = 16'hC4E0;
		49 : romout = 16'hC44A;
		50 : romout = 16'hC3BE;
		51 : romout = 16'hC33B;
		52 : romout = 16'hC2C2;
		53 : romout = 16'hC252;
		54 : romout = 16'hC1EC;
		55 : romout = 16'hC18F;
		56 : romout = 16'hC13B;
		57 : romout = 16'hC0F2;
		58 : romout = 16'hC0B2;
		59 : romout = 16'hC07C;
		60 : romout = 16'hC04F;
		61 : romout = 16'hC02D;
		62 : romout = 16'hC014;
		63 : romout = 16'hC005;
		default : romout = 16'hxxxx;
	endcase
endfunction

always @ (posedge clk)
begin
	data <= romout(addr);
end

//assign data = romout(addr);

endmodule