//--------------------------------------------------------------------------------------------------// Design    : nova// Author(s) : Ke Xu// Email	   : eexuke@yahoo.com// File      : BitStream_parser_FSM_gating.v// Generated : June 26,2005// Copyright (C) 2008 Ke Xu                //-------------------------------------------------------------------------------------------------// Description // BitStream_parser_FSM,clock gating version//-------------------------------------------------------------------------------------------------// synopsys translate_off`include "timescale.v"// synopsys translate_on`include "nova_defines.v"module BitStream_parser_FSM (clk,reset_n,end_of_one_blk4x4_sum,end_of_MB_DEC,	gclk_parser,gclk_nal,gclk_slice,gclk_sps,gclk_pps,gclk_slice_header,	gclk_slice_data,gclk_residual,gclk_cavlc,	trigger_CAVLC,BitStream_buffer_valid_n,nal_unit_type,	slice_type,num_ref_idx_active_override_flag,	deblocking_filter_control_present_flag,disable_deblocking_filter_idc,	mb_skip_run,mb_type_general,prev_intra4x4_pred_mode_flag,CodedBlockPatternLuma,	CodedBlockPatternChroma,pc_2to0,NumSubMbPart,NumMbPart,	TotalCoeff,TrailingOnes,maxNumCoeff,zerosLeft,run,		parser_state,nal_unit_state,slice_layer_wo_partitioning_state,slice_header_state,slice_header_s6,	ref_pic_list_reordering_state,dec_ref_pic_marking_state,slice_data_state,sub_mb_pred_state,	mb_pred_state,seq_parameter_set_state,pic_parameter_set_state,residual_state,cavlc_decoder_state,	heading_one_en,pic_num,mb_num,mb_num_h,mb_num_v,	NextMB_IsSkip,LowerMB_IsSkip,Is_skip_run_entry,Is_skip_run_end,	luma4x4BlkIdx,mbPartIdx,subMbPartIdx,compIdx,i8x8,i4x4,i4x4_CbCr,	coeffNum,i_level,i_run,i_TotalCoeff,	suffix_length_initialized,IsRunLoop);	input clk;	input reset_n;	input end_of_one_blk4x4_sum;	input end_of_MB_DEC;	input gclk_parser;	input gclk_nal;	input gclk_slice;	input gclk_sps;	input gclk_pps;	input gclk_slice_header;	input gclk_slice_data;	input gclk_residual;	input gclk_cavlc;	input trigger_CAVLC;	input BitStream_buffer_valid_n;	input [4:0] nal_unit_type;	input [2:0] slice_type;	input num_ref_idx_active_override_flag;	input deblocking_filter_control_present_flag;	input [1:0] disable_deblocking_filter_idc;	input [6:0] mb_skip_run;	input [3:0] mb_type_general;	input prev_intra4x4_pred_mode_flag;	input [3:0] CodedBlockPatternLuma;	input [1:0] CodedBlockPatternChroma;	input [2:0] pc_2to0;	input [2:0] NumMbPart;	input [2:0] NumSubMbPart;	input [4:0] TotalCoeff;	input [1:0] TrailingOnes;	input [4:0] maxNumCoeff;	input [3:0] zerosLeft;	input [3:0] run;		output [1:0] parser_state;	output [2:0] nal_unit_state;	output [1:0] slice_layer_wo_partitioning_state;	output [3:0] slice_header_state; 	output slice_header_s6;	output [2:0] ref_pic_list_reordering_state;	output [1:0] dec_ref_pic_marking_state;	output [3:0] slice_data_state;	output [1:0] sub_mb_pred_state;	output [2:0] mb_pred_state;	output [3:0] seq_parameter_set_state;	output [3:0] pic_parameter_set_state;	output [3:0] residual_state;	output [3:0] cavlc_decoder_state;	output heading_one_en;	output [5:0] pic_num;	output [6:0] mb_num;	output [3:0] mb_num_h;	output [3:0] mb_num_v;	output NextMB_IsSkip;	output LowerMB_IsSkip;	output Is_skip_run_entry;	output Is_skip_run_end;	output [3:0] luma4x4BlkIdx;	output [1:0] mbPartIdx;	output [1:0] subMbPartIdx;	output compIdx;	output [1:0] i8x8,i4x4;	output [1:0] i4x4_CbCr;	output [3:0] coeffNum;	output [3:0] i_level;	output [3:0] i_run;	output [3:0] i_TotalCoeff;	output suffix_length_initialized;	output IsRunLoop;		reg [1:0] parser_state;	reg [2:0] nal_unit_state;	reg [1:0] slice_layer_wo_partitioning_state;	reg [3:0] seq_parameter_set_state;	reg [3:0] pic_parameter_set_state;	reg [3:0] slice_header_state;	reg [2:0] ref_pic_list_reordering_state; 	reg [1:0] dec_ref_pic_marking_state;	reg [3:0] slice_data_state;	reg [2:0] mb_pred_state;	reg [1:0] sub_mb_pred_state;	reg [3:0] residual_state;	reg [3:0] cavlc_decoder_state;		wire heading_one_en;	reg [6:0] mb_num;	reg [3:0] mb_num_h;	reg [3:0] mb_num_v;	reg [1:0] mbPartIdx;	reg [1:0] subMbPartIdx;	reg compIdx;	reg	[1:0] i8x8,i4x4;	reg [1:0] i4x4_CbCr;	reg [3:0] coeffNum;	reg [3:0] coeffNum_reg;	reg [3:0] i_level,i_run,i_TotalCoeff;	reg [6:0] count_mb_skip_run;//number of MBs to be skipped	reg [7:0] count_pcm_byte;	reg [3:0] luma4x4BlkIdx;	reg [5:0] pic_num;	reg suffix_length_initialized;	reg IsRunLoop;		/*	// synopsys translate_off	integer	tracefile;	initial		begin			tracefile = $fopen("trace.txt");		end	// synopsys translate_on	*/	//--------------	//parser_state	//--------------	always @ (posedge gclk_parser or negedge reset_n)		if (reset_n == 0)			parser_state <= `rst_parser;		else			case (parser_state)				`rst_parser			  :parser_state <= (BitStream_buffer_valid_n == 1'b0)? `start_code_prefix:`rst_parser;				`start_code_prefix:parser_state <= `nal_unit;				`nal_unit			    :parser_state <= `rst_parser;			endcase	//---------------	//nal_unit_state	//---------------	always @ (posedge gclk_nal or negedge reset_n)		if (reset_n == 0)			nal_unit_state <= `rst_nal_unit;		else			case (nal_unit_state)				`rst_nal_unit:nal_unit_state <= `forbidden_zero_bit_2_nal_unit_type;				`forbidden_zero_bit_2_nal_unit_type:				case (nal_unit_type)					5'b00001:nal_unit_state <= `slice_layer_non_IDR_rbsp;					5'b00101:nal_unit_state <= `slice_layer_IDR_rbsp;					5'b00111:nal_unit_state <= `seq_parameter_set_rbsp;					5'b01000:nal_unit_state <= `pic_parameter_set_rbsp;				endcase				`slice_layer_non_IDR_rbsp,`slice_layer_IDR_rbsp:nal_unit_state <= `rbsp_trailing_one_bit;				`seq_parameter_set_rbsp :nal_unit_state <= `rbsp_trailing_one_bit;				`pic_parameter_set_rbsp :nal_unit_state <= `rbsp_trailing_one_bit; 				`rbsp_trailing_one_bit  :nal_unit_state <= (pc_2to0 == 3'b000)? `rst_nal_unit:`rbsp_trailing_zero_bits;				`rbsp_trailing_zero_bits:nal_unit_state <= `rst_nal_unit;			endcase	//----------------------------------	//slice_layer_wo_partitioning_state	//----------------------------------	always @ (posedge gclk_slice or negedge reset_n)		if (reset_n == 1'b0)			slice_layer_wo_partitioning_state <= `rst_slice_layer_wo_partitioning;		else			case (slice_layer_wo_partitioning_state)				`rst_slice_layer_wo_partitioning	:slice_layer_wo_partitioning_state <= `slice_header;				`slice_header					            :slice_layer_wo_partitioning_state <= `slice_data;				`slice_data						            :slice_layer_wo_partitioning_state <= `rst_slice_layer_wo_partitioning;			endcase	//------------------------	//seq_parameter_set_state	//------------------------	always @ (posedge gclk_sps or negedge reset_n)		if (reset_n == 0)			seq_parameter_set_state <= `rst_seq_parameter_set;		else			case (seq_parameter_set_state)				`rst_seq_parameter_set					          :seq_parameter_set_state <= `fixed_header;				`fixed_header							                :seq_parameter_set_state <= `level_idc_s;				`level_idc_s								              :seq_parameter_set_state <= `seq_parameter_set_id_sps_s;				`seq_parameter_set_id_sps_s				        :seq_parameter_set_state <= `log2_max_frame_num_minus4_s;				`log2_max_frame_num_minus4_s				      :seq_parameter_set_state <= `pic_order_cnt_type_s;				`pic_order_cnt_type_s					            :seq_parameter_set_state <= `log2_max_pic_order_cnt_lsb_minus4_s;				`log2_max_pic_order_cnt_lsb_minus4_s		  :seq_parameter_set_state <= `num_ref_frames_s;				`num_ref_frames_s						              :seq_parameter_set_state <= `gaps_in_frame_num_value_allowed_flag_s;				`gaps_in_frame_num_value_allowed_flag_s	  :seq_parameter_set_state <= `pic_width_in_mbs_minus1_s;				`pic_width_in_mbs_minus1_s				        :seq_parameter_set_state <= `pic_height_in_map_units_minus1_s;				`pic_height_in_map_units_minus1_s		      :seq_parameter_set_state <= `frame_mbs_only_flag_2_frame_cropping_flag;				`frame_mbs_only_flag_2_frame_cropping_flag:seq_parameter_set_state <= `vui_parameter_present_flag_s;				`vui_parameter_present_flag_s			        :seq_parameter_set_state <= `rst_seq_parameter_set;			endcase	//------------------------	//pic_parameter_set_state	//------------------------	always @ (posedge gclk_pps or negedge reset_n)		if (reset_n == 0)			pic_parameter_set_state <= `rst_pic_parameter_set;		else			case (pic_parameter_set_state)				`rst_pic_parameter_set				                             :pic_parameter_set_state <= `pic_parameter_set_id_pps_s;				`pic_parameter_set_id_pps_s			                           :pic_parameter_set_state <= `seq_parameter_set_id_pps_s;				`seq_parameter_set_id_pps_s			                           :pic_parameter_set_state <= `entropy_coding_mode_flag_2_pic_order_present_flag;				`entropy_coding_mode_flag_2_pic_order_present_flag         :pic_parameter_set_state <= `num_slice_groups_minus1_s;				`num_slice_groups_minus1_s			                           :pic_parameter_set_state <= `num_ref_idx_l0_active_minus1_pps_s;				`num_ref_idx_l0_active_minus1_pps_s	                       :pic_parameter_set_state <= `num_ref_idx_l1_active_minus1_pps_s;				`num_ref_idx_l1_active_minus1_pps_s	                       :pic_parameter_set_state <= `weighted_pred_flag_2_weighted_bipred_idc;				`weighted_pred_flag_2_weighted_bipred_idc                  :pic_parameter_set_state <= `pic_init_qp_minus26_s;				`pic_init_qp_minus26_s				                             :pic_parameter_set_state <= `pic_init_qs_minus26_s;				`pic_init_qs_minus26_s				                             :pic_parameter_set_state <= `chroma_qp_index_offset_s;				`chroma_qp_index_offset_s			                             :pic_parameter_set_state <= `deblocking_filter_control_2_redundant_pic_cnt_present_flag;				`deblocking_filter_control_2_redundant_pic_cnt_present_flag:pic_parameter_set_state <= `rst_pic_parameter_set;			endcase	//-------------------	//slice_header_state	//-------------------	always @ (posedge gclk_slice_header or negedge reset_n)		if (reset_n == 0)			begin				slice_header_state            <= `rst_slice_header;				ref_pic_list_reordering_state <= `rst_ref_pic_list_reordering;				dec_ref_pic_marking_state     <= `rst_dec_ref_pic_marking;			end		else			case (slice_header_state)				`rst_slice_header                   :slice_header_state <= `first_mb_in_slice_s;				`first_mb_in_slice_s                :slice_header_state <= `slice_type_s;				`slice_type_s                       :slice_header_state <= `pic_parameter_set_id_slice_header_s;				`pic_parameter_set_id_slice_header_s:slice_header_state <= `frame_num_s;				`frame_num_s:				if (nal_unit_type == 5'b00101)	     slice_header_state <= `idr_pic_id_s;				else							                   slice_header_state <= `pic_order_cnt_lsb_s;				`idr_pic_id_s                       :slice_header_state <= `pic_order_cnt_lsb_s;				`pic_order_cnt_lsb_s:				if (slice_type == 3'b101) 	         slice_header_state <= `num_ref_idx_active_override_flag_s;				else						                     slice_header_state <= `dec_ref_pic_marking;				`num_ref_idx_active_override_flag_s:				if (num_ref_idx_active_override_flag == 1'b1) slice_header_state <= `num_ref_idx_l0_active_minus1_slice_header_s;				else                                          slice_header_state <= `ref_pic_list_reordering;				`num_ref_idx_l0_active_minus1_slice_header_s :slice_header_state <= `ref_pic_list_reordering;				`ref_pic_list_reordering:				case (ref_pic_list_reordering_state)					`rst_ref_pic_list_reordering:					if (slice_type == 3'b101)						ref_pic_list_reordering_state <= `ref_pic_list_reordering_flag_l0_s;					else						begin							ref_pic_list_reordering_state <= `rst_ref_pic_list_reordering;							slice_header_state            <= `dec_ref_pic_marking;						end					`ref_pic_list_reordering_flag_l0_s:					begin						ref_pic_list_reordering_state <= `rst_ref_pic_list_reordering;						slice_header_state            <= `dec_ref_pic_marking;					end				endcase				`dec_ref_pic_marking:				case (dec_ref_pic_marking_state)					`rst_dec_ref_pic_marking:					dec_ref_pic_marking_state <= (nal_unit_type == 3'b101)? `no_output_of_prior_pics_flag_2_long_term_reference_flag:`adaptive_ref_pic_marking_mode_flag_s;					`no_output_of_prior_pics_flag_2_long_term_reference_flag:					begin						dec_ref_pic_marking_state <= `rst_dec_ref_pic_marking;						slice_header_state        <= `slice_qp_delta_s;					end					`adaptive_ref_pic_marking_mode_flag_s:					begin						dec_ref_pic_marking_state <= `rst_dec_ref_pic_marking;						slice_header_state        <= `slice_qp_delta_s;					end				endcase				`slice_qp_delta_s:				slice_header_state <= (deblocking_filter_control_present_flag == 1'b1)? `disable_deblocking_filter_idc_s:`rst_slice_header;				`disable_deblocking_filter_idc_s:				slice_header_state <= (disable_deblocking_filter_idc != 2'b01)? `slice_alpha_c0_offset_div2_s:`rst_slice_header;				`slice_alpha_c0_offset_div2_s:slice_header_state <= `slice_beta_offset_div2_s;				`slice_beta_offset_div2_s	   :slice_header_state <= `rst_slice_header;			endcase		assign slice_header_s6 = (slice_header_state == `frame_num_s)? 1'b1:1'b0;	//------------------	//slice_data_state	//------------------	reg  Is_skip_run_entry;	//for trigger inter pred.Originally it's a wire type which will trigger inter_pred signal too early							            //than expected:cause inter_pred rise up before mv_below8x8 is set to 4'b0 for P_skip.Thus the 							            //preload_counter after inter_pred will sample wrong mv_below8x8/mv_below8x8_curr.							            //Then it is changed to reg type to appear one cycle later @ May 15,2006	wire Is_skip_run_end;   //for stop triggering inter pred 			always @ (posedge clk)		if (reset_n == 1'b0)			Is_skip_run_entry <= 1'b0;		else if (slice_data_state == `mb_skip_run_s && mb_skip_run != 0)			Is_skip_run_entry <= 1'b1;		else 			Is_skip_run_entry <= 1'b0;