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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,
		output reg tx_sout,
		//
		output  ready_tx_data,
		output  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;
 
	reg [2:0] state_tx;
	reg [2:0] next_state_tx;
 
	reg [7:0]  null_s;
	reg [3:0]  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 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 last_tx_dout;
	reg last_tx_sout;
	//reg first_counter_ctr;
 
	reg [3:0] global_counter_transfer; 
 
assign ready_tx_timecode = (enable_time_code & global_counter_transfer == 14)?1'b1:1'b0;
 
assign ready_tx_data     = (enable_n_char & global_counter_transfer == 4'd10  & !data_tx_i[8])?1'b1:
			   (enable_n_char & global_counter_transfer == 4'd4   &  data_tx_i[8])?1'b1:1'b0;
 
always@(*)
begin
	tx_dout = 1'b0;
 
	 if(!enable_tx)
	 begin
	  	tx_dout = 1'b0;
	 end
	 else if( enable_null & first_time  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = null_s[7];
	 end
	 else if( enable_null & !first_time & last_type == NULL  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(null_s[6]^null_s[0]^null_s[1]);
	 end
	 else if( enable_null & !first_time & last_type == FCT   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(null_s[6]^fct_s[0]^fct_s[1]);
	 end
	 else if( enable_null & !first_time & last_type == EOP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(null_s[6]^eop_s[0]^eop_s[1]);
	 end
	 else if( enable_null & !first_time & last_type == EEP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(null_s[6]^eep_s[0]^eep_s[1]);
	 end
	 else if( enable_null & !first_time & last_type == DATA  & global_counter_transfer == 4'd0)
	 begin
		tx_dout =  !(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( enable_null & !first_time & last_type == TIMEC & global_counter_transfer == 4'd0)
	 begin
		tx_dout =  !(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( enable_null & !first_time & global_counter_transfer == 4'd1)
	 begin
		tx_dout = null_s[6];
	 end
	 else if( enable_null & !first_time & global_counter_transfer == 4'd2)
	 begin
		tx_dout = null_s[5];
	 end
	 else if( enable_null & !first_time & global_counter_transfer == 4'd3)
	 begin
		tx_dout = null_s[4];
	 end
	 else if( enable_null & !first_time & global_counter_transfer == 4'd4)
	 begin
		tx_dout = null_s[3];
	 end
	 else if( enable_null & !first_time & global_counter_transfer == 4'd5)
	 begin
		tx_dout = null_s[2];
	 end
	 else if( enable_null & !first_time & global_counter_transfer == 4'd6)
	 begin
		tx_dout = null_s[1];
	 end
	 else if( enable_null & !first_time & global_counter_transfer == 4'd7)
	 begin
		tx_dout = null_s[0];
	 end
	 else if( enable_fct  & !first_time & last_type == NULL  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(fct_s[2]^null_s[0]^null_s[1]);
	 end
	 else if( enable_fct  & !first_time & last_type == FCT   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(fct_s[2]^fct_s[0]^fct_s[1]);
	 end
	 else if( enable_fct  & !first_time & last_type == EOP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(fct_s[2]^eop_s[0]^eop_s[1]);
	 end
	 else if( enable_fct  & !first_time & last_type == EEP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(fct_s[2]^eep_s[0]^eep_s[1]);
	 end
	 else if ( enable_fct  & !first_time & last_type == DATA  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(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( enable_fct  & !first_time & last_type == TIMEC & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(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( enable_fct  & !first_time & global_counter_transfer == 4'd1)
	 begin
		tx_dout = fct_s[2];
	 end
	 else if( enable_fct  & !first_time & global_counter_transfer == 4'd2)
	 begin
		tx_dout = fct_s[1];
	 end
	 else if( enable_fct  & !first_time & global_counter_transfer == 4'd3)
	 begin
		tx_dout = fct_s[0];
	 end	
	 else if( enable_time_code & !first_time & last_type == NULL  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(timecode_s[12]^null_s[0]^null_s[1]);
	 end
	 else if( enable_time_code & !first_time & last_type == FCT   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(timecode_s[12]^fct_s[0]^fct_s[1]);
	 end
	 else if ( enable_time_code & !first_time & last_type == EOP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(timecode_s[12]^eop_s[0]^eop_s[1]);
	 end
	 else if( enable_time_code & !first_time & last_type == EEP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(timecode_s[12]^eep_s[0]^eep_s[1]);
	 end
	 else if( enable_time_code & !first_time & last_type == DATA  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(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( enable_time_code & !first_time & last_type == TIMEC & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(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( enable_time_code & !first_time & global_counter_transfer == 4'd1)
	 begin
		tx_dout = timecode_s[12];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd2)
	 begin
		tx_dout = timecode_s[11];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd3)
	 begin
		tx_dout = timecode_s[10];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd4)
	 begin
		tx_dout = timecode_s[9];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd5)
	 begin
		tx_dout = timecode_s[8];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd6)
	 begin
		tx_dout = timecode_s[7];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd7)
	 begin
		tx_dout = timecode_s[6];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd8)
	 begin
		tx_dout = timecode_s[5];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd9)
	 begin
		tx_dout = timecode_s[4];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd10)
	 begin
		tx_dout = timecode_s[3];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd11)
	 begin
		tx_dout = timecode_s[2];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd12)
	 begin
		tx_dout = timecode_s[1];
	 end
	 else if( enable_time_code & !first_time & global_counter_transfer == 4'd13)
	 begin
		tx_dout = timecode_s[0];
	 end
	 else if( enable_n_char    & !first_time & last_type == NULL  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(data_tx_i[8]^null_s[0]^null_s[1]);
	 end
	 else if( enable_n_char    & !first_time & last_type == FCT   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(data_tx_i[8]^fct_s[0]^fct_s[1]);
	 end
	 else if( enable_n_char    & !first_time & last_type == EOP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(data_tx_i[8]^eop_s[0]^eop_s[1]);
	 end
	 else if( enable_n_char    & !first_time & last_type == EEP   & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(data_tx_i[8]^eep_s[0]^eep_s[1]);
	 end
	 else if( enable_n_char    & !first_time & last_type == DATA  & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(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( enable_n_char    & !first_time & last_type == TIMEC & global_counter_transfer == 4'd0)
	 begin
		tx_dout = !(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( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd1)
	 begin
		tx_dout = data_tx_i[8];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd2)
	 begin
		tx_dout = data_tx_i[0];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd3)
	 begin
		tx_dout = data_tx_i[1];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd4)
	 begin
		tx_dout = data_tx_i[2];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd5)
	 begin
		tx_dout = data_tx_i[3];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd6)
	 begin
		tx_dout = data_tx_i[4];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd7)
	 begin
		tx_dout = data_tx_i[5];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd8)
	 begin
		tx_dout = data_tx_i[6];
	 end
	 else if( enable_n_char    & !data_tx_i[8] & !first_time & global_counter_transfer == 4'd9)
	 begin
		tx_dout = data_tx_i[7];
	 end
	 else if( enable_n_char    &  data_tx_i[8] & data_tx_i[1:0] == 2'b00 & !first_time & global_counter_transfer == 4'd1)
	 begin
		tx_dout = eop_s[2];
	 end
	 else if( enable_n_char    &  data_tx_i[8] & data_tx_i[1:0] == 2'b00 & !first_time & global_counter_transfer == 4'd2)
	 begin
		tx_dout = eop_s[1];
	 end
	 else if( enable_n_char    &  data_tx_i[8] & data_tx_i[1:0] == 2'b00 & !first_time & global_counter_transfer == 4'd3)
	 begin
		tx_dout = eop_s[0];
	 end
	 else if( enable_n_char    &  data_tx_i[8] & data_tx_i[1:0] == 2'b01 & !first_time & global_counter_transfer == 4'd1)
	 begin
		tx_dout = eep_s[2];
	 end
	 else if( enable_n_char    &  data_tx_i[8] & data_tx_i[1:0] == 2'b01 & !first_time & global_counter_transfer == 4'd2)
	 begin
		tx_dout = eep_s[1];
	 end
	 else if( enable_n_char    &  data_tx_i[8] & data_tx_i[1:0] == 2'b01 & !first_time & global_counter_transfer == 4'd3)
	 begin
		tx_dout = eep_s[0];
	 end
end
 
//strobe
always@(*)
begin
	tx_sout = 1'b0;
 
	if(!enable_tx)
	begin
		tx_sout = 1'b0;
	end 
	else if((enable_null | enable_fct) && tx_dout == last_tx_dout)
	begin
		tx_sout = !last_tx_sout;
	end
	else if((enable_null | enable_fct) && tx_dout != last_tx_dout)
	begin
		tx_sout = last_tx_sout;	
	end		
end
 
//slots open in another side
always@(posedge send_fct_tx or negedge enable_tx)
begin
 
	if(!enable_tx)
	begin
		fct_counter <= {6{1'b0}};
	end
	else if(gotfct_tx)
	begin
		fct_counter <= fct_counter + 6'd8;
	end
	else if(enable_n_char)
	begin
		fct_counter <= fct_counter - 6'd1;
	end
 
end
 
 
//slots open in our side
always@(posedge send_fct_now or negedge enable_tx)
begin
 
	if(!enable_tx)
	begin
		fct_send <= {3{1'b1}};
	end
	else
	begin
		fct_send <= fct_send + 6'd1;
	end
 
end
 
 
always@(*)
begin
 
	next_state_tx = state_tx;
 
	enable_null      = 1'b0;
	enable_fct       = 1'b0;
	enable_n_char    = 1'b0;
	enable_time_code = 1'b0;
 
	case(state_tx)
	tx_spw_start:
	begin
		if(send_null_tx && enable_tx)
		begin
			if(global_counter_transfer == 4'd7)
				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(global_counter_transfer == 4'd7)
		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;
		next_state_tx = tx_spw_null_fct;
 
		if(send_fct_tx && fct_flag != 3'd7)
		begin
			enable_null = 1'b0;
			enable_fct = 1'b1;
		end
		else
		begin
			enable_fct = 1'b0;
 
			if(send_fct_tx && gotfct_tx)
			begin
				if(global_counter_transfer == 4'd7)
					next_state_tx =  tx_spw_full;
			end
 
		end
	end
	tx_spw_full:
	begin
 
		enable_null = 1'b1;
 
		if(tickin_tx)
		begin
			if(global_counter_transfer == 4'd7 || global_counter_transfer == 4'd9 || global_counter_transfer == 4'd13 || global_counter_transfer == 4'd3)
				enable_time_code = 1'b1;
 
			enable_null = 1'b0;
		end 
		else if(fct_send > 3'd0)
		begin
			if(global_counter_transfer == 4'd7 || global_counter_transfer == 4'd9 || global_counter_transfer == 4'd13 || global_counter_transfer == 4'd3)
				enable_fct  = 1'b1;
 
			enable_null = 1'b0;
		end
		else if(txwrite_tx && fct_counter > 6'd0)
		begin
			if(global_counter_transfer == 4'd7 || global_counter_transfer == 4'd9 || global_counter_transfer == 4'd13 || global_counter_transfer == 4'd3)
				enable_n_char = 1'b1;
 
			enable_null = 1'b0;
		end
 
	end
	endcase
 
end
 
always@(posedge pclk_tx)
begin
	if(!enable_tx)
	begin
		null_s <= 8'h74;
		fct_s  <= 4'h4;
		eop_s  <= 4'h5;
		eep_s  <= 4'h6;
		timecode_s <= 14'h1e00;
 
		fct_flag <= 3'd0;
		first_time <= 1'b1;
		last_type  <= NULL;
 
		global_counter_transfer <= 4'd0;
		txdata_flagctrl_tx_last <= 9'd0;
		last_timein_control_flag_tx <= 8'd0;
		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
			fct_flag<= fct_flag;
			if(first_time)
			begin
				first_time <= 1'b0;
 
				global_counter_transfer <= global_counter_transfer + 4'd1;
			end
			else if(global_counter_transfer != 4'd7)
			begin
				global_counter_transfer <= global_counter_transfer + 4'd1;
			end
			else
			begin
				global_counter_transfer <= 4'd0;
			end
		end
		else if(enable_fct)
		begin
			if(global_counter_transfer != 4'd3)
			begin
				global_counter_transfer <= global_counter_transfer + 4'd1;
			end
			else
			begin
				global_counter_transfer <= 4'd0;
				fct_flag <= fct_flag + 3'd1;
			end
		end
		else if(enable_time_code)
		begin
			fct_flag<= fct_flag;
			if(global_counter_transfer < 4'd13)
			begin
				global_counter_transfer <= global_counter_transfer + 4'd1;
				last_timein_control_flag_tx <= timecode_tx_i;
			end
			else
			begin
				global_counter_transfer <= 4'd0;
			end
		end
		else if(enable_n_char)
		begin
			fct_flag<= fct_flag;
			if(global_counter_transfer < 4'd9 && !data_tx_i[8])
			begin
				global_counter_transfer <= global_counter_transfer + 4'd1;
				txdata_flagctrl_tx_last <= data_tx_i;
			end
			else if(global_counter_transfer < 4'd3 && data_tx_i[8])
			begin
				global_counter_transfer <= global_counter_transfer + 4'd1;
				txdata_flagctrl_tx_last <= data_tx_i;
			end
			else
			begin
				global_counter_transfer <= 4'd0;
			end
		end
 
	end
end
 
endmodule