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//+FHDR------------------------------------------------------------------------
//Copyright (c) 2013 Latin Group American Integhrated Circuit, Inc. All rights reserved
//GLADIC Open Source RTL
//-----------------------------------------------------------------------------
//FILE NAME	 :
//DEPARTMENT	 : IC Design / Verification
//AUTHOR	 : Felipe Fernandes da Costa
//AUTHOR’S EMAIL :
//-----------------------------------------------------------------------------
//RELEASE HISTORY
//VERSION DATE AUTHOR DESCRIPTION
//1.0 YYYY-MM-DD name
//-----------------------------------------------------------------------------
//KEYWORDS : General file searching keywords, leave blank if none.
//-----------------------------------------------------------------------------
//PURPOSE  : ECSS_E_ST_50_12C_31_july_2008
//-----------------------------------------------------------------------------
//PARAMETERS
//PARAM NAME		RANGE	: DESCRIPTION : DEFAULT : UNITS
//e.g.DATA_WIDTH	[32,16]	: width of the DATA : 32:
//-----------------------------------------------------------------------------
//REUSE ISSUES
//Reset Strategy	:
//Clock Domains		:
//Critical Timing	:
//Test Features		:
//Asynchronous I/F	:
//Scan Methodology	:
//Instantiations	:
//Synthesizable (y/n)	:
//Other			:
//-FHDR------------------------------------------------------------------------
 
`timescale 1ns/1ns
 
module TX_SPW (
		input pclk_tx,
		//
		input [8:0] data_tx_i,
		input txwrite_tx,
		//
		input [7:0] timecode_tx_i,
		input tickin_tx,
		//
		input enable_tx,
		input send_null_tx,
		input send_fct_tx,
 
		//
		input gotfct_tx,
		input send_fct_now,
		//
		output reg tx_dout_e,
		output reg tx_sout_e,
		//
		output  reg ready_tx_data,
		output  reg ready_tx_timecode
 
		);
 
localparam [2:0] tx_spw_start     = 3'b000,
	   	 tx_spw_null      = 3'b001,
	   	 tx_spw_null_fct  = 3'b010,
	   	 tx_spw_full      = 3'b100;
 
localparam [5:0] NULL     = 6'b000001,
		 FCT      = 6'b000010,
		 EOP      = 6'b000100,
		 EEP      = 6'b001000,
		 DATA     = 6'b010000,
		 TIMEC    = 6'b100000;
 
 
localparam [7:0] null_s = 8'b01110100;
localparam [2:0] fct_s  = 3'b100;
localparam [3:0] eop_s  = 4'b0101;
localparam [3:0] eep_s  = 4'b0110;
localparam [13:0] timecode_ss    = 14'b01110000000000;
 
 
 
	reg [2:0] state_tx;
	reg [2:0] next_state_tx;
 
	//reg [7:0]  null_s;
	//reg [2:0]  fct_s;
	//reg [3:0]  eop_s;
	//reg [3:0]  eep_s;
	reg [13:0] timecode_s;
 
	reg [5:0]  last_type;
	reg [8:0]  txdata_flagctrl_tx_last;
	reg [7:0]  last_timein_control_flag_tx;
 
	reg first_time;
 
	reg hold_null;
	reg hold_fct;
	reg hold_data;
	reg hold_time_code;
 
	reg enable_null;
	reg enable_fct;
	reg enable_n_char;
	reg enable_time_code;
 
	reg [2:0] fct_send;
	reg [2:0] fct_flag;
 
	reg [5:0] fct_counter;
	reg [5:0] fct_counter_receive;
 
	reg last_tx_dout;
	reg last_tx_sout;
 
	reg tx_dout;
	reg tx_sout;
 
	reg tx_dout_null;
	reg tx_dout_fct;
	reg tx_dout_timecode;
	reg tx_dout_data;
 
	reg block_sum;
	reg block_sum_fct_send;
 
	reg [3:0] global_counter_transfer; 
 
always@(*)
begin
	tx_dout_null = 1'b0;
 
	 if(enable_null)
	 begin
		 if(first_time  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null = null_s[7];
		 end
		 else if(last_type == NULL  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null = !(null_s[6]^null_s[0]^null_s[1]);
		 end
		 else if(last_type == FCT  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null = !(null_s[6]^fct_s[0]^fct_s[1]);
		 end
		 else if(last_type == EOP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null = !(null_s[6]^eop_s[0]^eop_s[1]);
		 end
		 else if(last_type == EEP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null = !(null_s[6]^eep_s[0]^eep_s[1]);
		 end
		 else if(last_type == DATA  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null =  !(null_s[6]^txdata_flagctrl_tx_last[0]^txdata_flagctrl_tx_last[1]^txdata_flagctrl_tx_last[2]^txdata_flagctrl_tx_last[3]^ txdata_flagctrl_tx_last[4]^txdata_flagctrl_tx_last[5]^txdata_flagctrl_tx_last[6]^txdata_flagctrl_tx_last[7]);
		 end
		 else if(last_type == TIMEC && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_null =  !(null_s[6]^last_timein_control_flag_tx[7]^last_timein_control_flag_tx[6]^last_timein_control_flag_tx[5]^last_timein_control_flag_tx[4]^last_timein_control_flag_tx[3]^last_timein_control_flag_tx[2]^last_timein_control_flag_tx[1]^last_timein_control_flag_tx[0]);
		 end
		 else if(global_counter_transfer[3:0] == 4'd1)
		 begin
			tx_dout_null = null_s[6];
		 end
		 else if(global_counter_transfer[3:0] == 4'd2)
		 begin
			tx_dout_null = null_s[5];
		 end
		 else if(global_counter_transfer[3:0] == 4'd3)
		 begin
			tx_dout_null = null_s[4];
		 end
		 else if(global_counter_transfer[3:0] == 4'd4)
		 begin
			tx_dout_null = null_s[3];
		 end
		 else if(global_counter_transfer[3:0] == 4'd5)
		 begin
			tx_dout_null = null_s[2];
		 end
		 else if(global_counter_transfer[3:0] == 4'd6)
		 begin
			tx_dout_null = null_s[1];
		 end
		 else if(global_counter_transfer[3:0] == 4'd7)
		 begin
			tx_dout_null = null_s[0];
		 end
	end
end
 
 
always@(*)
begin
 
	tx_dout_fct = 1'b0;
 
	if(enable_fct)
	begin
 
		 if(last_type == NULL  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_fct = !(fct_s[2]^null_s[0]^null_s[1]);
		 end
		 else if(last_type == FCT  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_fct = !(fct_s[2]^fct_s[0]^fct_s[1]);
		 end
		 else if(last_type == EOP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_fct = !(fct_s[2]^eop_s[0]^eop_s[1]);
		 end
		 else if(last_type == EEP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_fct = !(fct_s[2]^eep_s[0]^eep_s[1]);
		 end
		 else if (last_type == DATA && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_fct = !(fct_s[2]^txdata_flagctrl_tx_last[0]^txdata_flagctrl_tx_last[1]^txdata_flagctrl_tx_last[2]^txdata_flagctrl_tx_last[3]^ txdata_flagctrl_tx_last[4]^txdata_flagctrl_tx_last[5]^txdata_flagctrl_tx_last[6]^txdata_flagctrl_tx_last[7]);
		 end
		 else if(last_type == TIMEC && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_fct = !(fct_s[2]^last_timein_control_flag_tx[7]^last_timein_control_flag_tx[6]^last_timein_control_flag_tx[5]^last_timein_control_flag_tx[4]^last_timein_control_flag_tx[3]^last_timein_control_flag_tx[2]^last_timein_control_flag_tx[1]^last_timein_control_flag_tx[0]);
		 end
		 else if(global_counter_transfer[3:0] == 4'd1)
		 begin
			tx_dout_fct = fct_s[2];
		 end
		 else if(global_counter_transfer[3:0] == 4'd2)
		 begin
			tx_dout_fct = fct_s[1];
		 end
		 else if(global_counter_transfer[3:0] == 4'd3)
		 begin
			tx_dout_fct = fct_s[0];
		 end	
 
	end
end
 
always@(*)
begin
	tx_dout_timecode = 1'b0;
 
	if(enable_time_code)
	begin
		 if(last_type == NULL  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_timecode = !(timecode_s[12]^null_s[0]^null_s[1]);
		 end
		 else if(last_type == FCT   && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_timecode = !(timecode_s[12]^fct_s[0]^fct_s[1]);
		 end
		 else if (last_type == EOP   && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_timecode = !(timecode_s[12]^eop_s[0]^eop_s[1]);
		 end
		 else if( last_type == EEP   && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_timecode = !(timecode_s[12]^eep_s[0]^eep_s[1]);
		 end
		 else if( last_type == DATA  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_timecode = !(timecode_s[12]^txdata_flagctrl_tx_last[0]^txdata_flagctrl_tx_last[1]^txdata_flagctrl_tx_last[2]^txdata_flagctrl_tx_last[3]^ txdata_flagctrl_tx_last[4]^txdata_flagctrl_tx_last[5]^txdata_flagctrl_tx_last[6]^txdata_flagctrl_tx_last[7]);
		 end
		 else if( last_type == TIMEC && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_timecode = !(timecode_s[12]^last_timein_control_flag_tx[7]^last_timein_control_flag_tx[6]^last_timein_control_flag_tx[5]^last_timein_control_flag_tx[4]^last_timein_control_flag_tx[3]^last_timein_control_flag_tx[2]^last_timein_control_flag_tx[1]^last_timein_control_flag_tx[0]);
		 end
		 else if( global_counter_transfer[3:0] == 4'd1)
		 begin
			tx_dout_timecode = timecode_s[12];
		 end
		 else if( global_counter_transfer[3:0] == 4'd2)
		 begin
			tx_dout_timecode = timecode_s[11];
		 end
		 else if( global_counter_transfer[3:0] == 4'd3)
		 begin
			tx_dout_timecode = timecode_s[10];
		 end
		 else if( global_counter_transfer[3:0] == 4'd4)
		 begin
			tx_dout_timecode = timecode_s[9];
		 end
		 else if( global_counter_transfer[3:0] == 4'd5)
		 begin
			tx_dout_timecode = timecode_s[8];
		 end
		 else if( global_counter_transfer[3:0] == 4'd6)
		 begin
			tx_dout_timecode = timecode_s[0];
		 end
		 else if( global_counter_transfer[3:0] == 4'd7)
		 begin
			tx_dout_timecode = timecode_s[1];
		 end
		 else if( global_counter_transfer[3:0] == 4'd8)
		 begin
			tx_dout_timecode = timecode_s[2];
		 end
		 else if(global_counter_transfer[3:0] == 4'd9)
		 begin
			tx_dout_timecode = timecode_s[3];
		 end
		 else if(global_counter_transfer[3:0] == 4'd10)
		 begin
			tx_dout_timecode = timecode_s[4];
		 end
		 else if(global_counter_transfer[3:0] == 4'd11)
		 begin
			tx_dout_timecode = timecode_s[5];
		 end
		 else if( global_counter_transfer[3:0] == 4'd12)
		 begin
			tx_dout_timecode = timecode_s[6];
		 end
		 else if(global_counter_transfer[3:0] == 4'd13)
		 begin
			tx_dout_timecode = timecode_s[7];
		 end
	end
end
 
always@(*)
begin
 	tx_dout_data = 1'b0;
 
	if(enable_n_char)
	begin
		if(!data_tx_i[8] && last_type == NULL  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(data_tx_i[8]^null_s[0]^null_s[1]);
		 end
		 else if(!data_tx_i[8] && last_type == FCT && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(data_tx_i[8]^fct_s[0]^fct_s[1]);
		 end
		 else if(!data_tx_i[8] && last_type == EOP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(data_tx_i[8]^eop_s[0]^eop_s[1]);
		 end
		 else if(!data_tx_i[8] && last_type == EEP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(data_tx_i[8]^eep_s[0]^eep_s[1]);
		 end
		 else if(!data_tx_i[8] && last_type == DATA  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(data_tx_i[8]^txdata_flagctrl_tx_last[0]^txdata_flagctrl_tx_last[1]^txdata_flagctrl_tx_last[2]^txdata_flagctrl_tx_last[3]^ txdata_flagctrl_tx_last[4]^txdata_flagctrl_tx_last[5]^txdata_flagctrl_tx_last[6]^txdata_flagctrl_tx_last[7]);
		 end
		 else if(!data_tx_i[8] && last_type == TIMEC && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(data_tx_i[8]^last_timein_control_flag_tx[7]^last_timein_control_flag_tx[6]^last_timein_control_flag_tx[5]^last_timein_control_flag_tx[4]^last_timein_control_flag_tx[3]^last_timein_control_flag_tx[2]^last_timein_control_flag_tx[1]^last_timein_control_flag_tx[0]);
		 end
		 else if(data_tx_i[8]  && data_tx_i[1:0] == 2'b00 && last_type == NULL  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eop_s[2]^null_s[0]^null_s[1]);
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b00 && last_type == FCT   && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eop_s[2]^fct_s[0]^fct_s[1]);
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b00 && last_type == EOP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eop_s[2]^eop_s[0]^eop_s[1]);
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b00 && last_type == EEP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eop_s[2]^eep_s[0]^eep_s[1]);
		 end
		 else if(data_tx_i[8]  && data_tx_i[1:0] == 2'b00 && last_type == DATA  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eop_s[2]^txdata_flagctrl_tx_last[0]^txdata_flagctrl_tx_last[1]^txdata_flagctrl_tx_last[2]^txdata_flagctrl_tx_last[3]^ txdata_flagctrl_tx_last[4]^txdata_flagctrl_tx_last[5]^txdata_flagctrl_tx_last[6]^txdata_flagctrl_tx_last[7]);
		 end
		 else if(data_tx_i[8]  && data_tx_i[1:0] == 2'b00 && last_type == TIMEC && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eop_s[2]^last_timein_control_flag_tx[7]^last_timein_control_flag_tx[6]^last_timein_control_flag_tx[5]^last_timein_control_flag_tx[4]^last_timein_control_flag_tx[3]^last_timein_control_flag_tx[2]^last_timein_control_flag_tx[1]^last_timein_control_flag_tx[0]);
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b01 && last_type == NULL  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eep_s[2]^null_s[0]^null_s[1]);
		 end
		 else if(data_tx_i[8] & data_tx_i[1:0] == 2'b01 && last_type == FCT  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eep_s[2]^fct_s[0]^fct_s[1]);
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b01 && last_type == EOP  && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eep_s[2]^eop_s[0]^eop_s[1]);
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b01 && last_type == EEP && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eep_s[2]^eep_s[0]^eep_s[1]);
		 end
		 else if(data_tx_i[8]  && data_tx_i[1:0] == 2'b01 && last_type == DATA && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eep_s[2]^txdata_flagctrl_tx_last[0]^txdata_flagctrl_tx_last[1]^txdata_flagctrl_tx_last[2]^txdata_flagctrl_tx_last[3]^ txdata_flagctrl_tx_last[4]^txdata_flagctrl_tx_last[5]^txdata_flagctrl_tx_last[6]^txdata_flagctrl_tx_last[7]);
		 end
		 else if(data_tx_i[8]  &&  data_tx_i[1:0] == 2'b01 && last_type == TIMEC && global_counter_transfer[3:0] == 4'd0)
		 begin
			tx_dout_data = !(eep_s[2]^last_timein_control_flag_tx[7]^last_timein_control_flag_tx[6]^last_timein_control_flag_tx[5]^last_timein_control_flag_tx[4]^last_timein_control_flag_tx[3]^last_timein_control_flag_tx[2]^last_timein_control_flag_tx[1]^last_timein_control_flag_tx[0]);
		 end
		 else if(!data_tx_i[8] &&  global_counter_transfer[3:0] == 4'd1)
		 begin
			tx_dout_data = data_tx_i[8];
		 end
		 else if(!data_tx_i[8] && global_counter_transfer[3:0] == 4'd2)
		 begin
			tx_dout_data = data_tx_i[0];
		 end
		 else if(!data_tx_i[8] &&  global_counter_transfer[3:0] == 4'd3)
		 begin
			tx_dout_data = data_tx_i[1];
		 end
		 else if( !data_tx_i[8] && global_counter_transfer[3:0] == 4'd4)
		 begin
			tx_dout_data = data_tx_i[2];
		 end
		 else if(!data_tx_i[8]  && global_counter_transfer[3:0] == 4'd5)
		 begin
			tx_dout_data = data_tx_i[3];
		 end
		 else if(!data_tx_i[8]  && global_counter_transfer[3:0] == 4'd6)
		 begin
			tx_dout_data = data_tx_i[4];
		 end
		 else if(!data_tx_i[8]  && global_counter_transfer[3:0] == 4'd7)
		 begin
			tx_dout_data = data_tx_i[5];
		 end
		 else if(!data_tx_i[8] &&  global_counter_transfer[3:0] == 4'd8)
		 begin
			tx_dout_data = data_tx_i[6];
		 end
		 else if(!data_tx_i[8] &&  global_counter_transfer[3:0] == 4'd9)
		 begin
			tx_dout_data = data_tx_i[7];
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b01 && global_counter_transfer[3:0] == 4'd1)
		 begin
			tx_dout_data = eep_s[2];
		 end
		 else if( data_tx_i[8] && data_tx_i[1:0] == 2'b01 && global_counter_transfer[3:0] == 4'd2)
		 begin
			tx_dout_data = eep_s[1];
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b01 && global_counter_transfer[3:0] == 4'd3)
		 begin
			tx_dout_data = eep_s[0];
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b00 && global_counter_transfer[3:0] == 4'd1)
		 begin
			tx_dout_data = eop_s[2];
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b00 && global_counter_transfer[3:0] == 4'd2)
		 begin
			tx_dout_data = eop_s[1];
		 end
		 else if(data_tx_i[8] && data_tx_i[1:0] == 2'b00 && global_counter_transfer[3:0] == 4'd3)
		 begin
			tx_dout_data = eop_s[0];
		 end
	end
end
 
//strobe
always@(*)
begin
	tx_sout = 1'b0;
 
	if(!enable_tx)
	begin
		tx_sout = 1'b0;
	end 
	else if((enable_null | enable_fct | enable_n_char | enable_time_code) & tx_dout == last_tx_dout)
	begin
		tx_sout = !last_tx_sout;
	end
	else if((enable_null | enable_fct | enable_n_char | enable_time_code) & tx_dout != last_tx_dout)
	begin
		tx_sout = last_tx_sout;	
	end
end
 
always@(*)
begin
	fct_counter = 6'd0;
 
	if(gotfct_tx)
	begin
		if(block_sum)
		begin
 
		end
		else
		begin
			if(fct_counter_receive < 6'd48) 
			begin
				fct_counter = fct_counter_receive + 6'd8;
			end
			else
			begin
				fct_counter = fct_counter_receive + 6'd7;
 
			end
		end
	end
end
 
//slots open in our side
always@(*)
begin
 
	fct_send = {3{1'b0}};
 
	if(send_fct_now)
	begin
		if(block_sum_fct_send)
		begin
 
		end
		else
		begin
			if(fct_flag == 3'd7) 
			begin
				fct_send = 3'd0;
			end
			else
			begin
				fct_send = fct_flag + 3'd1;
 
			end
		end
	end
end
 
 
always@(*)
begin
 
 
	enable_null      = 1'b0;
	enable_fct       = 1'b0;
	enable_n_char    = 1'b0;
	enable_time_code = 1'b0;
 
	next_state_tx = state_tx;
 
	case(state_tx)
	tx_spw_start:
	begin
		if(send_null_tx && enable_tx)
		begin
			//if(!hold_null)
				next_state_tx = tx_spw_null;
 
			//enable_null = 1'b1;
		end
		else
		begin
			next_state_tx = tx_spw_start;
		end
	end
	tx_spw_null:
	begin
		enable_null = 1'b1;
 
		if(!hold_null)
		begin
			if(send_null_tx && send_fct_tx && enable_tx)
				next_state_tx = tx_spw_null_fct;
			else
				next_state_tx = tx_spw_null;	
		end
 
	end
	tx_spw_null_fct:
	begin
 
		enable_null   = 1'b1;
 
		if(send_fct_tx && fct_flag > 0  && !hold_null)
		begin
			next_state_tx = tx_spw_null_fct;
			enable_null = 1'b0;
			enable_fct  = 1'b1;
		end
		else
		begin
			enable_fct = 1'b0;
			if(send_fct_tx && fct_counter_receive > 6'd0)
			begin
				//if(global_counter_transfer == 4'd7)
					next_state_tx =  tx_spw_full;
			end
 
		end
	end
	tx_spw_full:
	begin
		if(tickin_tx && !hold_null && !hold_fct && !hold_data)
		begin
			enable_time_code = 1'b1;
		end 
		else if(fct_flag > 3'd0 && !hold_null && !hold_time_code && !hold_data)
		begin
			enable_fct  = 1'b1;
		end
		else if((txwrite_tx && !ready_tx_data && fct_counter_receive > 6'd0 && !hold_null && !hold_time_code && !hold_fct) == 1'b1 )
		begin
			enable_n_char = 1'b1;				
		end
		else
		begin
			enable_null = 1'b1;
		end
	end
	endcase
 
end
 
 
always@(*)
begin
 
	tx_dout = 1'b0;
 
	if(enable_null)
	begin
		tx_dout = tx_dout_null;
	end
	else if(enable_fct)
	begin
		tx_dout = tx_dout_fct;
	end
	else if(enable_time_code)
	begin
		tx_dout = tx_dout_timecode;
	end
	else if(enable_n_char)
	begin
		tx_dout = tx_dout_data;
	end
end
 
 
always@(posedge pclk_tx or negedge enable_tx)
begin
	if(!enable_tx)
	begin
		tx_dout_e <= 1'b0;
		tx_sout_e <= 1'b0;
	end
	else
	begin
		if(enable_null)
		begin
			tx_dout_e <= tx_dout;
			tx_sout_e <= tx_sout; 
		end
		else if(enable_fct)
		begin
			tx_dout_e <= tx_dout;
			tx_sout_e <= tx_sout;
		end
		else if(enable_time_code)
		begin
			tx_dout_e <= tx_dout;
			tx_sout_e <= tx_sout;
		end
		else if(enable_n_char)
		begin
			tx_dout_e <= tx_dout;
			tx_sout_e <= tx_sout;
		end
	end
end
 
always@(posedge pclk_tx or negedge enable_tx)
begin
	if(!enable_tx)
	begin
 
		timecode_s    <= 14'b01110000000000;	
		fct_flag      <= 3'd7;
 
		first_time 	  <= 1'b1;
		ready_tx_data	  <= 1'b0;
		ready_tx_timecode <= 1'b0;
 
		hold_null	<= 1'b0;
		hold_fct	<= 1'b0;
		hold_data	<= 1'b0;
		hold_time_code	<= 1'b0;
 
		last_type  <= NULL;
 
		global_counter_transfer <= 4'd0;
		txdata_flagctrl_tx_last <= 9'd0;
		last_timein_control_flag_tx <= 8'd0;
 
		fct_counter_receive <= 6'd0;
 
		block_sum  <= 1'b0;
		block_sum_fct_send <= 1'b0;
 
		last_tx_dout      <= 1'b0;
		last_tx_sout 	  <= 1'b0;
 
		state_tx <= tx_spw_start;
 
	end
	else
	begin
 
		state_tx <= next_state_tx;
		last_tx_dout <= tx_dout;
		last_tx_sout <= tx_sout;
 
		if(enable_null)
		begin
 
			//ready_tx_data <= 1'b0;
			ready_tx_timecode <= 1'b0;
			//hold_null	<= 1'b0;
			hold_fct	<= 1'b0;
			hold_data	<= 1'b0;
			hold_time_code	<= 1'b0;
 
			//
			if(gotfct_tx && !block_sum)
			begin
				fct_counter_receive <= fct_counter;
				block_sum<= 1'b1;
			end
			else if(!gotfct_tx)
			begin
				block_sum<= 1'b0;
			end
			else
				block_sum <= block_sum;
			//
			if(send_fct_now && !block_sum_fct_send)
			begin
				fct_flag <= fct_send;
				block_sum_fct_send<= 1'b1;
			end
			else if(!send_fct_now)
			begin
				block_sum_fct_send<= 1'b0;
			end
			else
				block_sum_fct_send <= block_sum_fct_send;
 
			if(global_counter_transfer == 4'd7)
			begin
				hold_null <= 1'b0;
			end
			else
			begin
				hold_null <= 1'b1;
			end
 
			if(first_time)
			begin
				first_time <= 1'b0;
				//hold_null  <= 1'b1;
				global_counter_transfer <= global_counter_transfer + 4'd1;
			end
			else if(global_counter_transfer != 4'd7)
			begin
				//hold_null  <= 1'b1;
				global_counter_transfer <= global_counter_transfer + 4'd1;
			end
			else
			begin
				//hold_null <= 1'b0;
				ready_tx_data <= 1'b0;
				last_type  <= NULL;
				global_counter_transfer <= 4'd0;
			end
		end
		else if(enable_fct)
		begin
			//ready_tx_data <= 1'b0;
			ready_tx_timecode <= 1'b0;
 
			hold_null	<= 1'b0;
			//hold_fct	<= 1'b0;
			hold_data	<= 1'b0;
			hold_time_code	<= 1'b0;
 
 
			if(gotfct_tx && !block_sum)
			begin
				fct_counter_receive <= fct_counter;
				block_sum<= 1'b1;
			end
			else if(!gotfct_tx)
			begin
				block_sum<= 1'b0;
			end
			else
				block_sum <= block_sum;
 
			if(global_counter_transfer == 4'd2)
				ready_tx_data <= 1'b0;
			else
				ready_tx_data <= ready_tx_data;
 
			if(global_counter_transfer == 4'd3)
			begin
				hold_fct <= 1'b0;
			end
			else
			begin
				hold_fct <= 1'b1;
			end
 
			if(global_counter_transfer != 4'd3)
			begin
				//hold_fct <= 1'b1;
				global_counter_transfer <= global_counter_transfer + 4'd1;
				//
				if(send_fct_now && !block_sum_fct_send)
				begin
					fct_flag <= fct_send;
					block_sum_fct_send<= 1'b1;
				end
				else if(!send_fct_now)
				begin
					block_sum_fct_send<= 1'b0;
				end
				else
					block_sum_fct_send <= block_sum_fct_send;
			end
			else
			begin
				//hold_fct <= 1'b0;
				global_counter_transfer <= 4'd0;
				fct_flag <= fct_flag - 3'd1;
				last_type  <=FCT;
			end
		end
		else if(enable_time_code)
		begin
 
			hold_null	<= 1'b0;
			hold_fct	<= 1'b0;
			hold_data	<= 1'b0;
			//hold_time_code	<= 1'b0;
 
			//ready_tx_data <= 1'b0;
 
			if(gotfct_tx && !block_sum)
			begin
				fct_counter_receive <= fct_counter;
				block_sum<= 1'b1;
			end
			else if(!gotfct_tx)
			begin
				block_sum<= 1'b0;
			end
			else
				block_sum <= block_sum;
 
			if(global_counter_transfer == 4'd13)
			begin
				ready_tx_timecode <= 1'b1;
			end
 
			if(global_counter_transfer == 4'd13)
			begin
				hold_time_code <= 1'b0;
			end
			else
			begin
				hold_time_code <= 1'b0;
			end
 
			//
			if(send_fct_now && !block_sum_fct_send)
			begin
				fct_flag <= fct_send;
				block_sum_fct_send<= 1'b1;
			end
			else if(!send_fct_now)
			begin
				block_sum_fct_send<= 1'b0;
			end
			else
				block_sum_fct_send <= block_sum_fct_send;
 
			if(global_counter_transfer != 4'd13)
			begin
				global_counter_transfer <= global_counter_transfer + 4'd1;
				timecode_s <= {timecode_ss[13:10],2'd2,timecode_tx_i[7:0]};
			end
			else
			begin
				ready_tx_data <= 1'b0;
				last_timein_control_flag_tx <= timecode_tx_i;
				global_counter_transfer <= 4'd0;
				last_type  <= TIMEC;
			end
		end
		else if(enable_n_char)
		begin
			ready_tx_timecode <= 1'b0;
			hold_null	<= 1'b0;
			hold_fct	<= 1'b0;
			//hold_data	<= 1'b0;
			hold_time_code	<= 1'b0;
 
			//
			if(send_fct_now && !block_sum_fct_send)
			begin
				fct_flag <= fct_send;
				block_sum_fct_send<= 1'b1;
			end
			else if(!send_fct_now)
			begin
				block_sum_fct_send<= 1'b0;
			end
			else
				block_sum_fct_send <= block_sum_fct_send;
 
			if(!data_tx_i[8])
			begin
 
				if(global_counter_transfer == 4'd9)
				begin
					hold_data <= 1'b0;
					ready_tx_data <= 1'b1;
				end
				else
				begin
					ready_tx_data <= 1'b0;
					hold_data <= 1'b1;
				end
 
				if(global_counter_transfer != 4'd9)
				begin
 
					global_counter_transfer <= global_counter_transfer + 4'd1;
					txdata_flagctrl_tx_last <= data_tx_i;
 
					if(gotfct_tx && !block_sum)
					begin
						fct_counter_receive <= fct_counter;
						block_sum<= 1'b1;
					end
					else if(!gotfct_tx)
					begin
						block_sum<= 1'b0;
					end
					else
						block_sum <= block_sum;
				end
				else
				begin
					global_counter_transfer <= 4'd0;
					fct_counter_receive <= fct_counter_receive - 6'd1;
					last_type  <= DATA;
				end
 
			end
			else if(data_tx_i[8])
			begin
 
				if(global_counter_transfer == 4'd3)
				begin
					hold_data <= 1'b0;
					ready_tx_data <= 1'b1;
				end
				else
				begin
					hold_data <= 1'b1;
					ready_tx_data <= 1'b0;
				end
 
				if(global_counter_transfer != 4'd3)
				begin
 
					global_counter_transfer <= global_counter_transfer + 4'd1;
					txdata_flagctrl_tx_last <= txdata_flagctrl_tx_last;
 
					if(gotfct_tx && !block_sum)
					begin
						fct_counter_receive <= fct_counter;
						block_sum<= 1'b1;
					end
					else if(!gotfct_tx)
					begin
						block_sum<= 1'b0;
					end
					else
						block_sum <= block_sum;
				end
				else
				begin
					global_counter_transfer <= 4'd0;
					fct_counter_receive <= fct_counter_receive - 6'd1;
 
					if(data_tx_i[1:0] == 2'b00)
					begin
						last_type  <=EOP;
					end
					else if(data_tx_i[1:0] == 2'b01)
					begin
						last_type  <=EEP;
					end
				end
			end
 
		end
 
	end
end
 
endmodule