nc_decoding.v

a H.264/AVC Baseline Decoder

			case (i8x8)
				1:
				case (i4x4)
					1:LumaLevel_mbAddrA[4:0] <= TotalCoeff;
					3:LumaLevel_mbAddrA[9:5] <= TotalCoeff;
				endcase
				3:
				case (i4x4)
					1:LumaLevel_mbAddrA[14:10] <= TotalCoeff;
					3:LumaLevel_mbAddrA[19:15] <= TotalCoeff;
				endcase
			endcase
	//----------------------------	
	//ChromaLevel_Cb_mbAddrA write 
	//----------------------------
	always @ (posedge clk)
		if (reset_n == 0)
			ChromaLevel_Cb_mbAddrA <= 0;
		else if (end_of_one_residual_block == 1 && residual_state == `ChromaACLevel_Cb_s && mb_num_h != 10)
			begin
				if (i4x4_CbCr == 1)
					ChromaLevel_Cb_mbAddrA[4:0] <= TotalCoeff;
				if (i4x4_CbCr == 3)
					ChromaLevel_Cb_mbAddrA[9:5] <= TotalCoeff;
			end
	//----------------------------	
	//ChromaLevel_Cr_mbAddrA write 
	//----------------------------
	always @ (posedge clk)
		if (reset_n == 0)
			ChromaLevel_Cr_mbAddrA <= 0;
		else if (end_of_one_residual_block == 1 && residual_state == `ChromaACLevel_Cr_s && mb_num_h != 10)
			begin
				if (i4x4_CbCr == 1)
					ChromaLevel_Cr_mbAddrA[4:0] <= TotalCoeff;
				if (i4x4_CbCr == 3)
					ChromaLevel_Cr_mbAddrA[9:5] <= TotalCoeff;
			end
	//------------------------------	
	//LumaLevel_mbAddrB read & write 
	//------------------------------
	always @ (reset_n or cavlc_decoder_state or residual_state or nB_availability or 
		Luma_8x8_AllZeroCoeff_mbAddrB or i8x8 or i4x4 or end_of_one_residual_block or 
		mb_num_v or mb_num_h or CodedBlockPatternLuma or LumaLevel_CurrMb2 or LumaLevel_CurrMb3 or TotalCoeff)
		if (reset_n == 0)
			begin
				LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
				LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
				LumaLevel_mbAddrB_din <= 0;
			end
		//--read--
		else if (cavlc_decoder_state == `nAnB_decoding_s && nB_availability == 1) //read
			case (residual_state)
				`Intra16x16DCLevel_s:
				if (Luma_8x8_AllZeroCoeff_mbAddrB == 0)
					begin
						LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
						LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
						LumaLevel_mbAddrB_din <= 0;
					end
				else
					begin
						LumaLevel_mbAddrB_cs_n    <= 0;        LumaLevel_mbAddrB_wr_n    <= 1;
						LumaLevel_mbAddrB_rd_addr <= mb_num_h; LumaLevel_mbAddrB_wr_addr <= 0;
						LumaLevel_mbAddrB_din <= 0;
					end
				`Intra16x16ACLevel_s,`LumaLevel_s:
				case (i8x8)
					0:
					if (Luma_8x8_AllZeroCoeff_mbAddrB[0] == 0)
						begin
							LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
							LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
							LumaLevel_mbAddrB_din <= 0;
						end
					else
						begin
							LumaLevel_mbAddrB_cs_n    <= 0;        LumaLevel_mbAddrB_wr_n    <= 1;
							LumaLevel_mbAddrB_rd_addr <= mb_num_h; LumaLevel_mbAddrB_wr_addr <= 0;
							LumaLevel_mbAddrB_din <= 0;
						end
					1:
					if (Luma_8x8_AllZeroCoeff_mbAddrB[1] == 0)
						begin
							LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
							LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
							LumaLevel_mbAddrB_din <= 0;
						end
					else
						begin
							LumaLevel_mbAddrB_cs_n    <= 0;        LumaLevel_mbAddrB_wr_n    <= 1;
							LumaLevel_mbAddrB_rd_addr <= mb_num_h; LumaLevel_mbAddrB_wr_addr <= 0;
							LumaLevel_mbAddrB_din <= 0;
						end
					default:
					begin
						LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
						LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
						LumaLevel_mbAddrB_din <= 0;
					end
				endcase
				default:
				begin
					LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
					LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
					LumaLevel_mbAddrB_din <= 0;
				end
			endcase
		//--write--
		else if ((residual_state == `Intra16x16ACLevel_s || residual_state == `LumaLevel_s) && end_of_one_residual_block == 1 && mb_num_v != 8)
			case (CodedBlockPatternLuma[3:2])
				2'b00:
				begin
					LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
					LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
					LumaLevel_mbAddrB_din <= 0;
				end
				2'b10,2'b11:
				if (i8x8 == 3 && i4x4 == 3)
					begin
						LumaLevel_mbAddrB_cs_n    <= 0; LumaLevel_mbAddrB_wr_n    <= 0;
						LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= mb_num_h;
						LumaLevel_mbAddrB_din <= (CodedBlockPatternLuma[3:2] == 2'b10)?
						{10'b0,	LumaLevel_CurrMb3[14:10],TotalCoeff}:
						{LumaLevel_CurrMb2[14:10],LumaLevel_CurrMb2[19:15],LumaLevel_CurrMb3[14:10],TotalCoeff};
					end
				else
					begin
						LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
						LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
						LumaLevel_mbAddrB_din <= 0;
					end
				2'b01:
				if (i8x8 == 2 && i4x4 == 3)
					begin
						LumaLevel_mbAddrB_cs_n    <= 0; LumaLevel_mbAddrB_wr_n    <= 0;
						LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= mb_num_h;
						LumaLevel_mbAddrB_din <= {LumaLevel_CurrMb2[14:10],TotalCoeff,10'b0};
					end
				else
					begin
						LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
						LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
						LumaLevel_mbAddrB_din <= 0;
					end
			endcase
		else
			begin
				LumaLevel_mbAddrB_cs_n    <= 1; LumaLevel_mbAddrB_wr_n    <= 1;
				LumaLevel_mbAddrB_rd_addr <= 0; LumaLevel_mbAddrB_wr_addr <= 0;
				LumaLevel_mbAddrB_din <= 0;
			end
	//-----------------------------------	
	//ChromaLevel_Cb_mbAddrB read & write 
	//-----------------------------------
	always @ (reset_n or cavlc_decoder_state or residual_state or nB_availability or i4x4_CbCr or ChromaLevel_Cb_CurrMb 
	  or Chroma_8x8_AllZeroCoeff_mbAddrB or mb_num_h or mb_num_v or TotalCoeff or end_of_one_residual_block)
		if (reset_n == 0)
			begin
				ChromaLevel_Cb_mbAddrB_cs_n    <= 1; ChromaLevel_Cb_mbAddrB_wr_n    <= 1;
				ChromaLevel_Cb_mbAddrB_rd_addr <= 0; ChromaLevel_Cb_mbAddrB_wr_addr <= 0;
				ChromaLevel_Cb_mbAddrB_din <= 0;
			end	
		//--read--
		else if (cavlc_decoder_state == `nAnB_decoding_s && nB_availability == 1 &&	
			residual_state == `ChromaACLevel_Cb_s)	
			begin
				if (i4x4_CbCr[1] == 0 && Chroma_8x8_AllZeroCoeff_mbAddrB == 1)
					begin
						ChromaLevel_Cb_mbAddrB_cs_n    <= 0;        ChromaLevel_Cb_mbAddrB_wr_n    <= 1;
						ChromaLevel_Cb_mbAddrB_rd_addr <= mb_num_h; ChromaLevel_Cb_mbAddrB_wr_addr <= 0;
						ChromaLevel_Cb_mbAddrB_din <= 0;
					end
				else
					begin
						ChromaLevel_Cb_mbAddrB_cs_n    <= 1; ChromaLevel_Cb_mbAddrB_wr_n    <= 1;
						ChromaLevel_Cb_mbAddrB_rd_addr <= 0; ChromaLevel_Cb_mbAddrB_wr_addr <= 0;
						ChromaLevel_Cb_mbAddrB_din <= 0;
					end
			end
		//--write--
		else if (residual_state == `ChromaACLevel_Cb_s && end_of_one_residual_block == 1 && mb_num_v != 8)
			begin
				if (i4x4_CbCr == 3)
					begin
						ChromaLevel_Cb_mbAddrB_cs_n    <= 0; ChromaLevel_Cb_mbAddrB_wr_n    <= 0;
						ChromaLevel_Cb_mbAddrB_rd_addr <= 0; ChromaLevel_Cb_mbAddrB_wr_addr <= mb_num_h;
						ChromaLevel_Cb_mbAddrB_din <= {ChromaLevel_Cb_CurrMb[14:10],TotalCoeff};
					end
				else
					begin
						ChromaLevel_Cb_mbAddrB_cs_n    <= 1; ChromaLevel_Cb_mbAddrB_wr_n    <= 1;
						ChromaLevel_Cb_mbAddrB_rd_addr <= 0; ChromaLevel_Cb_mbAddrB_wr_addr <= 0;
						ChromaLevel_Cb_mbAddrB_din <= 0;
					end
			end
		else
			begin
				ChromaLevel_Cb_mbAddrB_cs_n    <= 1; ChromaLevel_Cb_mbAddrB_wr_n    <= 1;
				ChromaLevel_Cb_mbAddrB_rd_addr <= 0; ChromaLevel_Cb_mbAddrB_wr_addr <= 0;
				ChromaLevel_Cb_mbAddrB_din <= 0;
			end
	//-----------------------------------	
	//ChromaLevel_Cr_mbAddrB read & write 
	//-----------------------------------
	always @ (reset_n or cavlc_decoder_state or residual_state or nB_availability or i4x4_CbCr
		or ChromaLevel_Cr_CurrMb or Chroma_8x8_AllZeroCoeff_mbAddrB or mb_num_h or mb_num_v or TotalCoeff
		or end_of_one_residual_block)
		if (reset_n == 0)
			begin
				ChromaLevel_Cr_mbAddrB_cs_n    <= 1; ChromaLevel_Cr_mbAddrB_wr_n    <= 1;
				ChromaLevel_Cr_mbAddrB_rd_addr <= 0; ChromaLevel_Cr_mbAddrB_wr_addr <= 0;
				ChromaLevel_Cr_mbAddrB_din <= 0;
			end
		//--read--
		else if (cavlc_decoder_state == `nAnB_decoding_s && nB_availability == 1 &&	residual_state == `ChromaACLevel_Cr_s)	//read
			begin
				if (i4x4_CbCr[1] == 0 && Chroma_8x8_AllZeroCoeff_mbAddrB == 1)
					begin
						ChromaLevel_Cr_mbAddrB_cs_n    <= 0;        ChromaLevel_Cr_mbAddrB_wr_n    <= 1;
						ChromaLevel_Cr_mbAddrB_rd_addr <= mb_num_h; ChromaLevel_Cr_mbAddrB_wr_addr <= 0;
						ChromaLevel_Cr_mbAddrB_din <= 0;
					end
				else
					begin
						ChromaLevel_Cr_mbAddrB_cs_n    <= 1; ChromaLevel_Cr_mbAddrB_wr_n    <= 1;
						ChromaLevel_Cr_mbAddrB_rd_addr <= 0; ChromaLevel_Cr_mbAddrB_wr_addr <= 0;
						ChromaLevel_Cr_mbAddrB_din <= 0;
					end
			end
		//--write--
		else if (residual_state == `ChromaACLevel_Cr_s && end_of_one_residual_block == 1 && mb_num_v != 8)
			begin
				if (i4x4_CbCr == 3)
					begin
						ChromaLevel_Cr_mbAddrB_cs_n    <= 0; ChromaLevel_Cr_mbAddrB_wr_n    <= 0;
						ChromaLevel_Cr_mbAddrB_rd_addr <= 0; ChromaLevel_Cr_mbAddrB_wr_addr <= mb_num_h;
						ChromaLevel_Cr_mbAddrB_din <= {ChromaLevel_Cr_CurrMb[14:10],TotalCoeff};
					end
				else
					begin
						ChromaLevel_Cr_mbAddrB_cs_n    <= 1; ChromaLevel_Cr_mbAddrB_wr_n    <= 1;
						ChromaLevel_Cr_mbAddrB_rd_addr <= 0; ChromaLevel_Cr_mbAddrB_wr_addr <= 0;
						ChromaLevel_Cr_mbAddrB_din <= 0;
					end
			end
		else
			begin
				ChromaLevel_Cr_mbAddrB_cs_n    <= 1; ChromaLevel_Cr_mbAddrB_wr_n    <= 1;
				ChromaLevel_Cr_mbAddrB_rd_addr <= 0; ChromaLevel_Cr_mbAddrB_wr_addr <= 0;
				ChromaLevel_Cr_mbAddrB_din <= 0;
			end
endmodule