S5443/S5443_M/S5443.srcs/sources_1/new/Math/MyIntToFp.v

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date:    12:14:34 01/28/2021 
// Design Name: 
// Module Name:    FpConvTop 
// Project Name: 
// Target Devices: 
// Tool versions: 
// Description: 
//
// Dependencies: 
//
// Revision: 
// Revision 0.01 - File Created
// Additional Comments: 
//
//////////////////////////////////////////////////////////////////////////////////
module	MyIntToFp	
#(	
	parameter	InWidth		=	32,
	parameter	ExpWidth	=	8,
	parameter	ManWidth	=	23,
	parameter	FracWidth	=	17
)
(Clk_i,Rst_i,InData_i,InDataVal_i,OutData_o,OutDataVal_o);

	input	Clk_i;
	input	Rst_i;
	input	[InWidth-1:0]	InData_i;
	input	InDataVal_i;
	
	localparam	OutWidth	=	1+ExpWidth+ManWidth;	//sign+ExpWidth+ManWidth
	localparam	ExpConst	=	(2**(ExpWidth-1))-1;
	
	output	reg	[OutWidth-1:0]	OutData_o;
	output	reg	OutDataVal_o;
	
//================================================================================
//  Func
	function integer Log2;
	input integer value;
		begin
			Log2 = 0;
			while (value > 1) begin
				value   = value >> 1;
				Log2    = Log2 + 1;
			end
			
			if	((2**Log2)<InWidth)	begin
				Log2	=	Log2+1;
			end	
		end
	endfunction
	
	localparam Stages = Log2(InWidth);
	
//================================================================================
//  Coding
	reg		[InWidth-1:0]	inDataR;
	reg		signR;
	reg		outValR;
	wire	[OutWidth-1:0]	fpOut;
	wire	[Stages-1:0]	distance;
	genvar  i;
	wire	[ExpWidth-1:0]	fpExp;
	
always	@(posedge	Clk_i)	begin
	if	(Rst_i)	begin
		inDataR	<=	{InWidth{1'b0}};
		signR	<=	1'b0;
		outValR	<=	1'b0;
	end	else	begin
		if	(InData_i	[InWidth-1])	begin
			inDataR	<=	~InData_i+1'b1;
		end	else	begin
			inDataR	<=	InData_i;
		end
		signR	<=	InData_i[InWidth-1];
		outValR	<=	InDataVal_i;
	end
end

wire	[(Stages+1)*InWidth-1:0]	dataArray;

assign  dataArray [InWidth-1:0] = inDataR;			
	
generate	
	for (i=0; i<Stages; i=i+1)	begin: searchMSB
		wire [InWidth-1:0] dataIn;	
        wire [InWidth-1:0] shiftedDataOut;
        wire [InWidth-1:0] dataOut;
		
        assign  dataIn = dataArray[(i+1)*InWidth-1:i*InWidth];

        wire    shiftDesired = ~|(dataIn[InWidth-1:InWidth-(1 << (Stages-1-i))]);
        assign  distance[(Stages-1-i)] = shiftDesired;		
        assign  shiftedDataOut = dataIn << (1 << (Stages-1-i));	
        assign  dataOut = shiftDesired ? shiftedDataOut : dataIn;	
        assign  dataArray[(i+2)*InWidth-1:(i+1)*InWidth] = dataOut;	
	end
endgenerate

wire	[InWidth-1:0]	scaledData	=	dataArray[(Stages+1)*InWidth-1:Stages*InWidth];
wire	[ManWidth-1:0]	mantisa		=	scaledData[InWidth-2 -:ManWidth];

assign	fpExp		=	(ExpConst+(InWidth-1-FracWidth))-distance;
assign	fpOut		=	&distance ? {signR, 31'h0}:	{signR, fpExp,	mantisa};

always	@(posedge	Clk_i	or	posedge	Rst_i)	begin
	if	(Rst_i)	begin
		OutData_o		<=	{OutWidth{1'b0}};
		OutDataVal_o	<=	1'b0;
	end	else	begin
		if	(outValR)	begin
			if	(fpOut!=0)	begin
				OutData_o	<=	fpOut;
			end	else	begin
				OutData_o	<=	32'h3a83126f;
			end
		end
		OutDataVal_o	<=	outValR;
	end
end
endmodule