`timescale 1ns / 1ps

module deparser_top #(
	parameter	C_AXIS_DATA_WIDTH = 512,
	parameter	C_AXIS_TUSER_WIDTH = 128,
	parameter	C_PKT_VEC_WIDTH = (6+4+2)*8*8+256,
	parameter	DEPARSER_MOD_ID = 3'b101,
	parameter	C_VLANID_WIDTH = 12,
	parameter	C_FIFO_BITS_WIDTH = 4
)
(
	input									axis_clk,
	input									aresetn,
	//
	input [C_AXIS_DATA_WIDTH-1:0]			pkt_fifo_tdata,
	input [C_AXIS_DATA_WIDTH/8-1:0]			pkt_fifo_tkeep,
	input [C_AXIS_TUSER_WIDTH-1:0]			pkt_fifo_tuser,
	input									pkt_fifo_tlast,
	input									pkt_fifo_empty,
	output									pkt_fifo_rd_en,

	input [C_PKT_VEC_WIDTH-1:0]				phv_fifo_out,
	input									phv_fifo_empty,
	output									phv_fifo_rd_en,

	output [C_AXIS_DATA_WIDTH-1:0]			depar_out_tdata,
	output [C_AXIS_DATA_WIDTH/8-1:0]		depar_out_tkeep,
	output [C_AXIS_TUSER_WIDTH-1:0]			depar_out_tuser,
	output									depar_out_tvalid,
	output 									depar_out_tlast,
	input									depar_out_tready,

	// control path
	input [C_AXIS_DATA_WIDTH-1:0]			ctrl_s_axis_tdata,
	input [C_AXIS_TUSER_WIDTH-1:0]			ctrl_s_axis_tuser,
	input [C_AXIS_DATA_WIDTH/8-1:0]			ctrl_s_axis_tkeep,
	input									ctrl_s_axis_tvalid,
	input									ctrl_s_axis_tlast
);

wire [C_AXIS_DATA_WIDTH-1:0]		fst_half_fifo_tdata_in, fst_half_fifo_tdata_out;
wire [C_AXIS_TUSER_WIDTH-1:0]		fst_half_fifo_tuser_in, fst_half_fifo_tuser_out;
wire [C_AXIS_DATA_WIDTH/8-1:0]		fst_half_fifo_tkeep_in, fst_half_fifo_tkeep_out;
wire								fst_half_fifo_tlast_in, fst_half_fifo_tlast_out;
wire fst_half_fifo_empty;
wire fst_half_fifo_full;
wire fst_half_fifo_valid_in;
wire fst_half_fifo_rd_en;

reg [C_AXIS_DATA_WIDTH-1:0]			fst_half_fifo_tdata_in_r;
reg [C_AXIS_TUSER_WIDTH-1:0]		fst_half_fifo_tuser_in_r;
reg [C_AXIS_DATA_WIDTH/8-1:0]		fst_half_fifo_tkeep_in_r;
reg									fst_half_fifo_tlast_in_r;
reg									fst_half_fifo_valid_in_r;

wire [C_AXIS_DATA_WIDTH-1:0]		snd_half_fifo_tdata_in, snd_half_fifo_tdata_out;
wire [C_AXIS_TUSER_WIDTH-1:0]		snd_half_fifo_tuser_in, snd_half_fifo_tuser_out;
wire [C_AXIS_DATA_WIDTH/8-1:0]		snd_half_fifo_tkeep_in, snd_half_fifo_tkeep_out;
wire 								snd_half_fifo_tlast_in, snd_half_fifo_tlast_out;
wire snd_half_fifo_empty;
wire snd_half_fifo_full;
wire snd_half_fifo_valid_in;
wire snd_half_fifo_rd_en;

reg [C_AXIS_DATA_WIDTH-1:0]			snd_half_fifo_tdata_in_r;
reg [C_AXIS_TUSER_WIDTH-1:0]		snd_half_fifo_tuser_in_r;
reg [C_AXIS_DATA_WIDTH/8-1:0]		snd_half_fifo_tkeep_in_r;
reg									snd_half_fifo_tlast_in_r;
reg									snd_half_fifo_valid_in_r;

fallthrough_small_fifo #(
	.WIDTH(C_AXIS_DATA_WIDTH+C_AXIS_TUSER_WIDTH+C_AXIS_DATA_WIDTH/8+1),
	.MAX_DEPTH_BITS(4)
)
fst_half_fifo (
	.din				({fst_half_fifo_tdata_in_r, fst_half_fifo_tuser_in_r, fst_half_fifo_tkeep_in_r, fst_half_fifo_tlast_in_r}),
	.wr_en				(fst_half_fifo_valid_in_r),
	// .din				({fst_half_fifo_tdata_in, fst_half_fifo_tuser_in, fst_half_fifo_tkeep_in, fst_half_fifo_tlast_in}),
	// .wr_en				(fst_half_fifo_valid_in),
	//
	.rd_en				(fst_half_fifo_rd_en),
	.dout				({fst_half_fifo_tdata_out, fst_half_fifo_tuser_out, fst_half_fifo_tkeep_out, fst_half_fifo_tlast_out}),
	//
	.full				(),
	.prog_full			(),
	.nearly_full		(fst_half_fifo_full),
	.empty				(fst_half_fifo_empty),
	.reset				(~aresetn),
	.clk				(axis_clk)
);

fallthrough_small_fifo #(
	.WIDTH(C_AXIS_DATA_WIDTH+C_AXIS_TUSER_WIDTH+C_AXIS_DATA_WIDTH/8+1),
	.MAX_DEPTH_BITS(4)
)
snd_half_fifo (
	.din				({snd_half_fifo_tdata_in_r, snd_half_fifo_tuser_in_r, snd_half_fifo_tkeep_in_r, snd_half_fifo_tlast_in_r}),
	.wr_en				(snd_half_fifo_valid_in_r),
	// .din				({snd_half_fifo_tdata_in, snd_half_fifo_tuser_in, snd_half_fifo_tkeep_in, snd_half_fifo_tlast_in}),
	// .wr_en				(snd_half_fifo_valid_in),
	//
	.rd_en				(snd_half_fifo_rd_en),
	.dout				({snd_half_fifo_tdata_out, snd_half_fifo_tuser_out, snd_half_fifo_tkeep_out, snd_half_fifo_tlast_out}),
	//
	.full				(),
	.prog_full			(),
	.nearly_full		(snd_half_fifo_full),
	.empty				(snd_half_fifo_empty),
	.reset				(~aresetn),
	.clk				(axis_clk)
);

//===============================================

wire [C_VLANID_WIDTH-1:0] vlan_fifo_in, vlan_fifo_out;
wire vlan_valid_in;
wire vlan_fifo_rd_en;
wire vlan_fifo_full;
wire vlan_fifo_empty;

// vlan fifo
fallthrough_small_fifo #(
	.WIDTH(C_VLANID_WIDTH),
	.MAX_DEPTH_BITS(5)
)
vlan_fifo (
	.din					(vlan_fifo_in),
	.wr_en					(vlan_valid_in),
	//
	.rd_en					(vlan_fifo_rd_en),
	.dout					(vlan_fifo_out),
	//
	.full					(),
	.prog_full				(),
	.nearly_full			(vlan_fifo_full),
	.empty					(vlan_fifo_empty),
	.reset					(~aresetn),
	.clk					(axis_clk)
);

wire [C_AXIS_DATA_WIDTH-1:0]	seg_fifo_tdata_in, seg_fifo_tdata_out;
wire [C_AXIS_TUSER_WIDTH-1:0]	seg_fifo_tuser_in, seg_fifo_tuser_out;
wire [C_AXIS_DATA_WIDTH/8-1:0]	seg_fifo_tkeep_in, seg_fifo_tkeep_out;
wire							seg_fifo_tlast_in, seg_fifo_tlast_out;
wire seg_fifo_valid_in;
wire seg_fifo_rd_en;
wire seg_fifo_full;
wire seg_fifo_empty;

reg [C_AXIS_DATA_WIDTH-1:0]		seg_fifo_tdata_in_r;
reg [C_AXIS_TUSER_WIDTH-1:0]	seg_fifo_tuser_in_r;
reg [C_AXIS_DATA_WIDTH/8-1:0]	seg_fifo_tkeep_in_r;
reg								seg_fifo_tlast_in_r;
reg								seg_fifo_valid_in_r;
// seg fifo
fallthrough_small_fifo #(
	.WIDTH(C_AXIS_DATA_WIDTH+C_AXIS_TUSER_WIDTH+C_AXIS_DATA_WIDTH/8+1),
	.MAX_DEPTH_BITS(5)
)
seg_fifo (
	.din					({seg_fifo_tdata_in_r, seg_fifo_tuser_in_r, seg_fifo_tkeep_in_r, seg_fifo_tlast_in_r}),
	.wr_en					(seg_fifo_valid_in_r),
	// .din					({seg_fifo_tdata_in, seg_fifo_tuser_in, seg_fifo_tkeep_in, seg_fifo_tlast_in}),
	// .wr_en					(seg_fifo_valid_in),
	//
	.rd_en					(seg_fifo_rd_en),
	.dout					({seg_fifo_tdata_out, seg_fifo_tuser_out, seg_fifo_tkeep_out, seg_fifo_tlast_out}),
	//
	.full					(),
	.prog_full				(),
	.nearly_full			(seg_fifo_full),
	.empty					(seg_fifo_empty),
	.reset					(~aresetn),
	.clk					(axis_clk)
);

//
depar_wait_segs #(
)
wait_segs
(
	.clk										(axis_clk),
	.aresetn									(aresetn),

	.pkt_fifo_tdata								(pkt_fifo_tdata),
	.pkt_fifo_tuser								(pkt_fifo_tuser),
	.pkt_fifo_tkeep								(pkt_fifo_tkeep),
	.pkt_fifo_tlast								(pkt_fifo_tlast),
	.pkt_fifo_empty								(pkt_fifo_empty),

	.fst_half_fifo_ready						(~fst_half_fifo_full),
	.snd_half_fifo_ready						(~snd_half_fifo_full),

	.pkt_fifo_rd_en								(pkt_fifo_rd_en),
	.vlan										(vlan_fifo_in),
	.vlan_valid									(vlan_valid_in),

	.fst_half_tdata								(fst_half_fifo_tdata_in),
	.fst_half_tuser								(fst_half_fifo_tuser_in),
	.fst_half_tkeep								(fst_half_fifo_tkeep_in),
	.fst_half_tlast								(fst_half_fifo_tlast_in),
	.fst_half_valid								(fst_half_fifo_valid_in),
	//
	.snd_half_tdata								(snd_half_fifo_tdata_in),
	.snd_half_tuser								(snd_half_fifo_tuser_in),
	.snd_half_tkeep								(snd_half_fifo_tkeep_in),
	.snd_half_tlast								(snd_half_fifo_tlast_in),
	.snd_half_valid								(snd_half_fifo_valid_in),
	//
	.output_fifo_tdata							(seg_fifo_tdata_in),
	.output_fifo_tuser							(seg_fifo_tuser_in),
	.output_fifo_tkeep							(seg_fifo_tkeep_in),
	.output_fifo_tlast							(seg_fifo_tlast_in),
	.output_fifo_valid							(seg_fifo_valid_in),
	.output_fifo_ready							(~seg_fifo_full)
);

//
depar_do_deparsing #(
	.C_PKT_VEC_WIDTH(C_PKT_VEC_WIDTH),
	.DEPARSER_MOD_ID(DEPARSER_MOD_ID)
)
do_deparsing
(
	.clk										(axis_clk),
	.aresetn									(aresetn),
	// phv
	.phv_fifo_out								(phv_fifo_out),
	.phv_fifo_empty								(phv_fifo_empty),
	.phv_fifo_rd_en								(phv_fifo_rd_en),
	// vlan
	.vlan_id									(vlan_fifo_out),
	.vlan_fifo_empty							(vlan_fifo_empty),
	.vlan_fifo_rd_en							(vlan_fifo_rd_en),
	// first half
	.fst_half_fifo_tdata						(fst_half_fifo_tdata_out),
	.fst_half_fifo_tuser						(fst_half_fifo_tuser_out),
	.fst_half_fifo_tkeep						(fst_half_fifo_tkeep_out),
	.fst_half_fifo_tlast						(fst_half_fifo_tlast_out),
	.fst_half_fifo_empty						(fst_half_fifo_empty),
	.fst_half_fifo_rd_en						(fst_half_fifo_rd_en),
	// second half
	.snd_half_fifo_tdata						(snd_half_fifo_tdata_out),
	.snd_half_fifo_tuser						(snd_half_fifo_tuser_out),
	.snd_half_fifo_tkeep						(snd_half_fifo_tkeep_out),
	.snd_half_fifo_tlast						(snd_half_fifo_tlast_out),
	.snd_half_fifo_empty						(snd_half_fifo_empty),
	.snd_half_fifo_rd_en						(snd_half_fifo_rd_en),
	// segs
	.pkt_fifo_tdata								(seg_fifo_tdata_out),
	.pkt_fifo_tuser								(seg_fifo_tuser_out),
	.pkt_fifo_tkeep								(seg_fifo_tkeep_out),
	.pkt_fifo_tlast								(seg_fifo_tlast_out),
	.pkt_fifo_empty								(seg_fifo_empty),
	.pkt_fifo_rd_en								(seg_fifo_rd_en),
	// output
	.depar_out_tdata							(depar_out_tdata),
	.depar_out_tuser							(depar_out_tuser),
	.depar_out_tkeep							(depar_out_tkeep),
	.depar_out_tlast							(depar_out_tlast),
	.depar_out_tvalid							(depar_out_tvalid),
	.depar_out_tready							(depar_out_tready),
	// control path
	.ctrl_s_axis_tdata							(ctrl_s_axis_tdata),
	.ctrl_s_axis_tuser							(ctrl_s_axis_tuser),
	.ctrl_s_axis_tkeep							(ctrl_s_axis_tkeep),
	.ctrl_s_axis_tvalid							(ctrl_s_axis_tvalid),
	.ctrl_s_axis_tlast							(ctrl_s_axis_tlast)
);


always @(posedge axis_clk) begin
	if (~aresetn) begin
		//
		fst_half_fifo_tdata_in_r <= 0;
		fst_half_fifo_tuser_in_r <= 0;
		fst_half_fifo_tkeep_in_r <= 0;
		fst_half_fifo_tlast_in_r <= 0;
		fst_half_fifo_valid_in_r <= 0;
		//
		snd_half_fifo_tdata_in_r <= 0;
		snd_half_fifo_tuser_in_r <= 0;
		snd_half_fifo_tkeep_in_r <= 0;
		snd_half_fifo_tlast_in_r <= 0;
		snd_half_fifo_valid_in_r <= 0;
		//
		seg_fifo_tdata_in_r <= 0;
		seg_fifo_tuser_in_r <= 0;
		seg_fifo_tkeep_in_r <= 0;
		seg_fifo_tlast_in_r <= 0;
		seg_fifo_valid_in_r <= 0;
	end
	else begin
		//
		fst_half_fifo_tdata_in_r <= fst_half_fifo_tdata_in;
		fst_half_fifo_tuser_in_r <= fst_half_fifo_tuser_in;
		fst_half_fifo_tkeep_in_r <= fst_half_fifo_tkeep_in;
		fst_half_fifo_tlast_in_r <= fst_half_fifo_tlast_in;
		fst_half_fifo_valid_in_r <= fst_half_fifo_valid_in;
		//
		snd_half_fifo_tdata_in_r <= snd_half_fifo_tdata_in;
		snd_half_fifo_tuser_in_r <= snd_half_fifo_tuser_in;
		snd_half_fifo_tkeep_in_r <= snd_half_fifo_tkeep_in;
		snd_half_fifo_tlast_in_r <= snd_half_fifo_tlast_in;
		snd_half_fifo_valid_in_r <= snd_half_fifo_valid_in;
		//
		seg_fifo_tdata_in_r <= seg_fifo_tdata_in;
		seg_fifo_tuser_in_r <= seg_fifo_tuser_in;
		seg_fifo_tkeep_in_r <= seg_fifo_tkeep_in;
		seg_fifo_tlast_in_r <= seg_fifo_tlast_in;
		seg_fifo_valid_in_r <= seg_fifo_valid_in;
	end
end

endmodule