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[/] [nova/] [trunk/] [src/] [pc_decoding.v] - Rev 12
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//-------------------------------------------------------------------------------------------------- // Design : nova // Author(s) : Ke Xu // Email : eexuke@yahoo.com // File : pc_decoding.v // Generated : June 6, 2005 // Copyright (C) 2008 Ke Xu //------------------------------------------------------------------------------------------------- // Description // Decoding program counter for bitstream_buffer //------------------------------------------------------------------------------------------------- // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "nova_defines.v" module pc_decoding (clk,reset_n,parser_state,nal_unit_state,slice_header_state,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,exp_golomb_len,dependent_variable_len,cavlc_consumed_bits_len, pc); input clk,reset_n; input [1:0] parser_state; input [2:0] nal_unit_state; input [3:0] slice_header_state; input [2:0] ref_pic_list_reordering_state; input [1:0] dec_ref_pic_marking_state; input [3:0] slice_data_state; input [1:0] sub_mb_pred_state; input [2:0] mb_pred_state; input [3:0] seq_parameter_set_state; input [3:0] pic_parameter_set_state; input [3:0] exp_golomb_len; input [3:0] dependent_variable_len; input [4:0] cavlc_consumed_bits_len; output [6:0] pc; reg [6:0] pc; reg [2:0] consumed_bits_sel; reg [4:0] FixedLen; always @ (reset_n or parser_state or nal_unit_state or slice_header_state or ref_pic_list_reordering_state or dec_ref_pic_marking_state or slice_data_state or sub_mb_pred_state or mb_pred_state or seq_parameter_set_state or pic_parameter_set_state) if (reset_n == 0) consumed_bits_sel <= `rst_consumed_bits_sel; else if (parser_state == `start_code_prefix) consumed_bits_sel <= `fixed_length; else if (nal_unit_state == `forbidden_zero_bit_2_nal_unit_type) consumed_bits_sel <= `fixed_length; else if (slice_header_state != `rst_slice_header) case (slice_header_state) `first_mb_in_slice_s :consumed_bits_sel <= `exp_golomb; `slice_type_s :consumed_bits_sel <= `exp_golomb; `pic_parameter_set_id_slice_header_s :consumed_bits_sel <= `exp_golomb; `frame_num_s :consumed_bits_sel <= `dependent_variable; `idr_pic_id_s :consumed_bits_sel <= `exp_golomb; `pic_order_cnt_lsb_s :consumed_bits_sel <= `dependent_variable; `num_ref_idx_active_override_flag_s :consumed_bits_sel <= `fixed_length; `num_ref_idx_l0_active_minus1_slice_header_s:consumed_bits_sel <= `exp_golomb; `ref_pic_list_reordering: case (ref_pic_list_reordering_state) `ref_pic_list_reordering_flag_l0_s:consumed_bits_sel <= `fixed_length; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase `dec_ref_pic_marking: case (dec_ref_pic_marking_state) `no_output_of_prior_pics_flag_2_long_term_reference_flag:consumed_bits_sel <= `fixed_length; `adaptive_ref_pic_marking_mode_flag_s :consumed_bits_sel <= `fixed_length; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase `slice_qp_delta_s :consumed_bits_sel <= `exp_golomb; `disable_deblocking_filter_idc_s:consumed_bits_sel <= `exp_golomb; `slice_alpha_c0_offset_div2_s :consumed_bits_sel <= `exp_golomb; `slice_beta_offset_div2_s :consumed_bits_sel <= `exp_golomb; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase else if (slice_data_state != `rst_slice_data) case (slice_data_state) `mb_skip_run_s :consumed_bits_sel <= `exp_golomb; `mb_type_s :consumed_bits_sel <= `exp_golomb; `pcm_alignment_zero_bit_s:consumed_bits_sel <= `exp_golomb; `pcm_byte_s :consumed_bits_sel <= `pcm_alignment; `sub_mb_pred: case (sub_mb_pred_state) `rst_sub_mb_pred:consumed_bits_sel <= `rst_consumed_bits_sel; default :consumed_bits_sel <= `exp_golomb; endcase `mb_pred: case (mb_pred_state) `prev_intra4x4_pred_mode_flag_s:consumed_bits_sel <= `fixed_length; `rem_intra4x4_pred_mode_s :consumed_bits_sel <= `fixed_length; `intra_chroma_pred_mode_s :consumed_bits_sel <= `exp_golomb; `ref_idx_l0_s :consumed_bits_sel <= `exp_golomb; `mvd_l0_s :consumed_bits_sel <= `exp_golomb; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase `coded_block_pattern_s:consumed_bits_sel <= `exp_golomb; `mb_qp_delta_s :consumed_bits_sel <= `exp_golomb; `residual :consumed_bits_sel <= `cavlc_consumed; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase else if (seq_parameter_set_state != `rst_seq_parameter_set) case (seq_parameter_set_state) `fixed_header :consumed_bits_sel <= `fixed_length; `level_idc_s :consumed_bits_sel <= `fixed_length; `seq_parameter_set_id_sps_s :consumed_bits_sel <= `exp_golomb; `log2_max_frame_num_minus4_s :consumed_bits_sel <= `exp_golomb; `pic_order_cnt_type_s :consumed_bits_sel <= `exp_golomb; `log2_max_pic_order_cnt_lsb_minus4_s :consumed_bits_sel <= `exp_golomb; `num_ref_frames_s :consumed_bits_sel <= `exp_golomb; `gaps_in_frame_num_value_allowed_flag_s :consumed_bits_sel <= `fixed_length; `pic_width_in_mbs_minus1_s :consumed_bits_sel <= `exp_golomb; `pic_height_in_map_units_minus1_s :consumed_bits_sel <= `exp_golomb; `frame_mbs_only_flag_2_frame_cropping_flag:consumed_bits_sel <= `fixed_length; `vui_parameter_present_flag_s :consumed_bits_sel <= `fixed_length; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase else if (pic_parameter_set_state != `rst_pic_parameter_set) case (pic_parameter_set_state) `pic_parameter_set_id_pps_s :consumed_bits_sel <= `exp_golomb; `seq_parameter_set_id_pps_s :consumed_bits_sel <= `exp_golomb; `entropy_coding_mode_flag_2_pic_order_present_flag :consumed_bits_sel <= `fixed_length; `num_slice_groups_minus1_s :consumed_bits_sel <= `exp_golomb; `num_ref_idx_l0_active_minus1_pps_s :consumed_bits_sel <= `exp_golomb; `num_ref_idx_l1_active_minus1_pps_s :consumed_bits_sel <= `exp_golomb; `weighted_pred_flag_2_weighted_bipred_idc :consumed_bits_sel <= `fixed_length; `pic_init_qp_minus26_s :consumed_bits_sel <= `exp_golomb; `pic_init_qs_minus26_s :consumed_bits_sel <= `exp_golomb; `chroma_qp_index_offset_s :consumed_bits_sel <= `exp_golomb; `deblocking_filter_control_2_redundant_pic_cnt_present_flag:consumed_bits_sel <= `fixed_length; default :consumed_bits_sel <= `rst_consumed_bits_sel; endcase else if (nal_unit_state == `rbsp_trailing_one_bit) consumed_bits_sel <= `fixed_length; else if (nal_unit_state == `rbsp_trailing_zero_bits) consumed_bits_sel <= `trailing_bits; else consumed_bits_sel <= `rst_consumed_bits_sel; always @ (reset_n or parser_state or nal_unit_state or slice_header_state or ref_pic_list_reordering_state or dec_ref_pic_marking_state or slice_data_state or mb_pred_state or seq_parameter_set_state or pic_parameter_set_state) if (reset_n == 0) FixedLen <= 0; else begin if (parser_state == `start_code_prefix) FixedLen <= 5'd16; else if (nal_unit_state == `forbidden_zero_bit_2_nal_unit_type) FixedLen <= 8; else if (slice_header_state == `num_ref_idx_active_override_flag_s) FixedLen <= 1; else if (ref_pic_list_reordering_state == `ref_pic_list_reordering_flag_l0_s) FixedLen <= 1; else if (dec_ref_pic_marking_state == `no_output_of_prior_pics_flag_2_long_term_reference_flag) FixedLen <= 2; else if (dec_ref_pic_marking_state == `adaptive_ref_pic_marking_mode_flag_s) FixedLen <= 1; else if (slice_data_state == `pcm_byte_s) FixedLen <= 5'd16; else if (mb_pred_state == `prev_intra4x4_pred_mode_flag_s) FixedLen <= 1; else if (mb_pred_state == `rem_intra4x4_pred_mode_s) FixedLen <= 3; else if (seq_parameter_set_state == `fixed_header) FixedLen <= 5'd16; else if (seq_parameter_set_state == `level_idc_s) FixedLen <= 8; else if (seq_parameter_set_state == `gaps_in_frame_num_value_allowed_flag_s) FixedLen <= 1; else if (seq_parameter_set_state == `frame_mbs_only_flag_2_frame_cropping_flag) FixedLen <= 3; else if (seq_parameter_set_state == `vui_parameter_present_flag_s) FixedLen <= 1; else if (pic_parameter_set_state == `entropy_coding_mode_flag_2_pic_order_present_flag) FixedLen <= 2; else if (pic_parameter_set_state == `weighted_pred_flag_2_weighted_bipred_idc) FixedLen <= 3; else if (pic_parameter_set_state == `deblocking_filter_control_2_redundant_pic_cnt_present_flag) FixedLen <= 3; else if (nal_unit_state == `rbsp_trailing_one_bit) FixedLen <= 1; else FixedLen <= 1; end reg [6:0] pc_reg; always @ (consumed_bits_sel or pc_reg or exp_golomb_len or dependent_variable_len or cavlc_consumed_bits_len or FixedLen) case (consumed_bits_sel) `exp_golomb :pc <= pc_reg + exp_golomb_len; `dependent_variable:pc <= pc_reg + dependent_variable_len; `cavlc_consumed :pc <= pc_reg + cavlc_consumed_bits_len; `fixed_length :pc <= pc_reg + FixedLen; `trailing_bits :pc <= (pc_reg[2:0] == 3'b000)? pc_reg:{{pc_reg[6:3] + 1},3'b0}; `pcm_alignment :pc <= (pc_reg[2:0] == 3'b000)? pc_reg:{{pc_reg[6:3] + 1},3'b0}; default :pc <= pc_reg; endcase always @ (posedge clk) pc_reg <= (reset_n == 0)? 0:pc; endmodule
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