intra_pred_pe.v

a H.264/AVC Baseline Decoder

						PE2_in0 <= 0;
					if (blk4x4_intra_calculate_counter != 0)
						//blk0,2,8,10,calc counter == 3'b100:PE2_in1 <= c_ext x 2
						//other cases                       :PE2_in1 <= b_ext
						PE2_in1 <= (blk4x4_intra_calculate_counter == 4 && !blk4x4_rec_counter[2] && !blk4x4_rec_counter[0])? 
									{c_ext[14:0],1'b0}:b_ext;
					else
						PE2_in1 <= 0;
					//blk0,2, 8,10,calc counter == 3'b100:PE2_in2 <= c_ext;
					//blk4,6,12,14,calc counter == 3'b100:PE2_in2 <= c_ext x 2;
					//other cases						 :PE2_in2 <= 0
					if (blk4x4_intra_calculate_counter == 3'b100 && !blk4x4_rec_counter[0])
						PE2_in2 <= (blk4x4_rec_counter[2])? {c_ext[14:0],1'b0}:c_ext;
					else
						PE2_in2 <= 0;
					PE2_in3	<= 0;
					PE2_IsShift 	<= 1'b0;
					PE2_IsStore		<= (blk4x4_intra_calculate_counter != 0)? 1'b1:1'b0;
					PE2_IsClip 		<= (blk4x4_intra_calculate_counter != 0)? 1'b1:1'b0;
					PE2_full_bypass	<= 1'b0;
					PE2_round_value <= (blk4x4_intra_calculate_counter != 0)? 5'd16:5'd0;
					PE2_shift_len	<= (blk4x4_intra_calculate_counter != 0)? 3'd5 :3'd0;
				end
			endcase
		//Chroma
		else if (mb_type_general[3] == 1'b1 && blk4x4_rec_counter > 15)
			case (Intra_chroma_predmode)
				//--------------------
				//no PE2 for Chroma DC
				//2'b00:
				//--------------------
				`Intra_chroma_Horizontal:	//---horizontal---
				begin
					PE2_in0 <= (blk4x4_intra_calculate_counter != 0)? Intra_mbAddrA_window2:0;
					PE2_in1 		<= 0; 	PE2_in2 		<= 0;	PE2_in3 	  <= 0; 		
					PE2_IsShift 	<= 0;	PE2_IsStore 	<= 0;	PE2_IsClip    <= 0;
					PE2_full_bypass <= 1;	PE2_round_value <= 0;	PE2_shift_len <= 0;
				end
				`Intra_chroma_Vertical:		//---vertical---
				begin
					case (blk4x4_intra_calculate_counter)
						4:PE2_in0 <= Intra_mbAddrB_window0;
						3:PE2_in0 <= Intra_mbAddrB_window1;
						2:PE2_in0 <= Intra_mbAddrB_window2;
						1:PE2_in0 <= Intra_mbAddrB_window3;
						default:PE2_in0 <= 0;
					endcase
					PE2_in1 		<= 0; 	PE2_in2 		<= 0;	PE2_in3       <= 0; 		
					PE2_IsShift 	<= 0;	PE2_IsStore 	<= 0;	PE2_IsClip 	  <= 0;
					PE2_full_bypass <= 1;	PE2_round_value <= 0;	PE2_shift_len <= 0;
				end
				`Intra_chroma_Plane:	//---plane---
				begin
					if (blk4x4_intra_calculate_counter != 0)
						//need seed,	   blk4x4 = 16 | 18 | 20 | 22
						//do not need seed,blk4x4 = 17 | 19 | 21 | 23
						PE2_in0 <= (blk4x4_rec_counter[0] == 1'b0 && blk4x4_intra_calculate_counter == 4)? 
									seed:PE2_out_reg;
					else
						PE2_in0 <= 0; 
					if (blk4x4_intra_calculate_counter != 0)
						PE2_in1 <= (blk4x4_rec_counter[0] == 1'b0 && blk4x4_intra_calculate_counter == 4)? 
									c_ext:b_ext;
					else
						PE2_in1 <= 0;
					PE2_in2 	<= (blk4x4_rec_counter[0] == 1'b0 && blk4x4_intra_calculate_counter == 4)? 
									c_ext:0;
					PE2_in3		<= 0;
					PE2_IsShift <= (blk4x4_rec_counter[0] == 1'b0 && blk4x4_intra_calculate_counter == 4)? 
									1'b1:1'b0;
					PE2_IsStore		<= (blk4x4_intra_calculate_counter != 0)? 1'b1:1'b0;
					PE2_IsClip 		<= (blk4x4_intra_calculate_counter != 0)? 1'b1:1'b0;
					PE2_full_bypass	<= 1'b0;
					PE2_round_value <= (blk4x4_intra_calculate_counter != 0)? 5'd16:5'd0;
					PE2_shift_len	<= (blk4x4_intra_calculate_counter != 0)? 3'd5 :3'd0;
				end
				default:
				begin
					PE2_in0 <= 0;	PE2_in1 <= 0;	PE2_in2 <= 0;	PE2_in3 <= 0;
					PE2_IsShift 	<= 0;	PE2_IsStore 	<= 0;	PE2_IsClip 	  <= 0;
					PE2_full_bypass <= 0;	PE2_round_value <= 0;	PE2_shift_len <= 0;	
				end
			endcase
		else
			begin
				PE2_in0 <= 0;	PE2_in1 <= 0;	PE2_in2 <= 0;	PE2_in3 <= 0;
				PE2_IsShift 	<= 0;	PE2_IsStore 	<= 0;	PE2_IsClip 	  <= 0;
				PE2_full_bypass <= 0;	PE2_round_value <= 0;	PE2_shift_len <= 0;	
			end
			
	//----
	//PE3 |
	//----
	always @ (mb_type_general or blk4x4_rec_counter or blk4x4_intra_calculate_counter
		or Intra4x4_predmode or Intra16x16_predmode or Intra_chroma_predmode
		or mbAddrA_availability or mbAddrB_availability
		or Intra_mbAddrA_window0 or Intra_mbAddrA_window1 or Intra_mbAddrA_window2 or Intra_mbAddrA_window3
		or Intra_mbAddrB_window0 or Intra_mbAddrB_window1 or Intra_mbAddrB_window2 or Intra_mbAddrB_window3
		or Intra_mbAddrC_window0 or Intra_mbAddrC_window1 or Intra_mbAddrC_window2 or Intra_mbAddrC_window3
		
		or Intra_mbAddrA_reg12 or Intra_mbAddrA_reg13 or Intra_mbAddrA_reg14 or Intra_mbAddrA_reg15
		or Intra_mbAddrB_reg13 or Intra_mbAddrB_reg14 or Intra_mbAddrB_reg15
		or blk4x4_pred_output0 or blk4x4_pred_output4  or blk4x4_pred_output5
		or blk4x4_pred_output6 or blk4x4_pred_output8 or blk4x4_pred_output9
		or PE3_out_reg
		
		or seed or b_ext or c_ext)
		//Intra 4x4
		if (mb_type_general[3:2] == 2'b11 && blk4x4_rec_counter < 16)
			case (Intra4x4_predmode)
				`Intra4x4_Vertical:		//---Vertical---
				begin
					case (blk4x4_intra_calculate_counter)
						4:PE3_in0 <= Intra_mbAddrB_window0;
						3:PE3_in0 <= Intra_mbAddrB_window1;
						2:PE3_in0 <= Intra_mbAddrB_window2;
						1:PE3_in0 <= Intra_mbAddrB_window3;
						default:PE3_in0 <= 0;
					endcase
					PE3_in1 	    <= 0; 	PE3_in2    	    <= 0;	PE3_in3 	  <= 0;	
					PE3_IsShift     <= 0;	PE3_IsStore     <= 0;	PE3_IsClip    <= 0;	
					PE3_full_bypass <= 1;	PE3_round_value <= 0;	PE3_shift_len <= 0;
				end
				`Intra4x4_Horizontal:	//---Horizontal---
				begin
					PE3_in0 <= (blk4x4_intra_calculate_counter != 0)? Intra_mbAddrA_window3:0;
					PE3_in1 	    <= 0; 	PE3_in2 		<= 0;	PE3_in3       <= 0; 	
					PE3_IsShift     <= 0;	PE3_IsStore     <= 0;	PE3_IsClip    <= 0;
					PE3_full_bypass <= 1;	PE3_round_value <= 0;	PE3_shift_len <= 0;
				end
				//-------------
				//no PE2 for DC
				//4'b0010:
				//-------------
				`Intra4x4_Diagonal_Down_Left:	//---diagonal down-left---
				begin
					case (blk4x4_intra_calculate_counter)
						4:begin	PE3_in0 <= Intra_mbAddrB_window3;	PE3_in1 <= Intra_mbAddrC_window1;
								PE3_in2 <= Intra_mbAddrC_window0;				end
						3:begin	PE3_in0 <= Intra_mbAddrC_window0;	PE3_in1 <= Intra_mbAddrC_window2;
								PE3_in2 <= Intra_mbAddrC_window1;				end
						2:begin	PE3_in0 <= Intra_mbAddrC_window1;	PE3_in1 <= Intra_mbAddrC_window3;
								PE3_in2 <= Intra_mbAddrC_window2;				end
						1:begin	PE3_in0 <= Intra_mbAddrC_window2;	PE3_in1 <= Intra_mbAddrC_window3;
								PE3_in2 <= Intra_mbAddrC_window3;				end		
						default:begin	PE3_in0 <= 0;PE3_in1 <= 0;PE3_in2 <= 0;	end
					endcase
					PE3_in3 <= 0;
					PE3_IsShift <= (blk4x4_intra_calculate_counter == 0)? 1'b0:1'b1;
					PE3_IsStore <= 1'b0; PE3_IsClip <= 1'b0;	PE3_full_bypass <= 1'b0;
					PE3_round_value <= (blk4x4_intra_calculate_counter == 0)? 5'd0:5'd2; // +2
					PE3_shift_len	<= (blk4x4_intra_calculate_counter == 0)? 3'd0:3'd2;   // >>2
				end	
				`Intra4x4_Diagonal_Down_Right:	//---diagonal down-right---
				begin
					case (blk4x4_intra_calculate_counter)
						4:PE3_in0 <= Intra_mbAddrA_window1;
						3:PE3_in0 <= blk4x4_pred_output8;
						2:PE3_in0 <= blk4x4_pred_output4;
						1:PE3_in0 <= blk4x4_pred_output0;
						default:PE3_in0 <= 0;
					endcase
					PE3_in1 <= (blk4x4_intra_calculate_counter == 4)? Intra_mbAddrA_window3:0;
					PE3_in2 <= (blk4x4_intra_calculate_counter == 4)? Intra_mbAddrA_window2:0;
					PE3_in3 <= 0;
					PE3_IsShift <= (blk4x4_intra_calculate_counter == 0)? 1'b0:1'b1;
					PE3_IsStore <= 1'b0; PE3_IsClip <= 1'b0;	
					PE3_full_bypass <= (blk4x4_intra_calculate_counter == 4)? 1'b0:1'b1;
					PE3_round_value <= (blk4x4_intra_calculate_counter == 0)? 5'd0:5'd2; // +2
					PE3_shift_len	<= (blk4x4_intra_calculate_counter == 0)? 3'd0:3'd2; // >>2
				end
				`Intra4x4_Vertical_Right:		//---vertical right---
				begin
					case (blk4x4_intra_calculate_counter)
						4:PE3_in0 <= Intra_mbAddrA_window0;
						3:PE3_in0 <= blk4x4_pred_output4;
						2:PE3_in0 <= blk4x4_pred_output5;
						1:PE3_in0 <= blk4x4_pred_output6;
						default:PE3_in0 <= 0;
					endcase
					PE3_in1 <= (blk4x4_intra_calculate_counter == 4)? Intra_mbAddrA_window2:0;
					PE3_in2 <= (blk4x4_intra_calculate_counter == 4)? Intra_mbAddrA_window1:0;
					PE3_in3 <= 0;
					PE3_IsShift <= (blk4x4_intra_calculate_counter == 0)? 1'b0:1'b1;
					PE3_IsStore <= 1'b0; PE3_IsClip <= 1'b0;	
					PE3_full_bypass <= (blk4x4_intra_calculate_counter == 4)? 1'b0:1'b1;
					PE3_round_value <= (blk4x4_intra_calculate_counter == 0)? 5'd0:5'd2; // +2
					PE3_shift_len	<= (blk4x4_intra_calculate_counter == 0)? 3'd0:3'd2; // >>2
				end
				`Intra4x4_Horizontal_Down:	//---horizontal down---
				begin
					case (blk4x4_intra_calculate_counter)
						4:PE3_in0 <= Intra_mbAddrA_window2;
						3:PE3_in0 <= Intra_mbAddrA_window1;
						2:PE3_in0 <= blk4x4_pred_output8;
						1:PE3_in0 <= blk4x4_pred_output9;
						default:PE3_in0 <= 0;
					endcase
					PE3_in1 <= (blk4x4_intra_calculate_counter == 4 || blk4x4_intra_calculate_counter == 3)?
								Intra_mbAddrA_window3:0;
					PE3_in2 <= (blk4x4_intra_calculate_counter == 3)? Intra_mbAddrA_window2:0;
					PE3_in3 <= 0;
					PE3_IsShift <= (blk4x4_intra_calculate_counter == 3)? 1'b1:1'b0;
					PE3_IsStore <= 1'b0; PE3_IsClip <= 1'b0;	
					PE3_full_bypass <= (blk4x4_intra_calculate_counter == 2 || 
										blk4x4_intra_calculate_counter == 1)? 1'b1:1'b0;
					PE3_round_value <= (blk4x4_intra_calculate_counter == 4)? 5'd1:
									   (blk4x4_intra_calculate_counter == 3)? 5'd2:5'd0; 
				 	PE3_shift_len	<= (blk4x4_intra_calculate_counter == 4)? 3'd1:
									   (blk4x4_intra_calculate_counter == 3)? 3'd2:3'd0; 
				end
				`Intra4x4_Vertical_Left:	//---vertical left---
				begin
					case (blk4x4_intra_calculate_counter)
						4:begin	PE3_in0 <= Intra_mbAddrB_window1;	PE3_in1 <= Intra_mbAddrB_window3;
								PE3_in2 <= Intra_mbAddrB_window2;				end
						3:begin	PE3_in0 <= Intra_mbAddrB_window2;	PE3_in1 <= Intra_mbAddrC_window0;
								PE3_in2 <= Intra_mbAddrB_window3;				end
						2:begin	PE3_in0 <= Intra_mbAddrB_window3;	PE3_in1 <= Intra_mbAddrC_window1;
								PE3_in2 <= Intra_mbAddrC_window0;				end
						1:begin	PE3_in0 <= Intra_mbAddrC_window0;	PE3_in1 <= Intra_mbAddrC_window2;
								PE3_in2 <= Intra_mbAddrC_window1;				end		
						default:begin	PE3_in0 <= 0;PE3_in1 <= 0;PE3_in2 <= 0;	end
					endcase
					PE3_in3 <= 0;
					PE3_IsShift <= (blk4x4_intra_calculate_counter == 0)? 1'b0:1'b1;
					PE3_IsStore <= 1'b0; PE3_IsClip <= 1'b0;	PE3_full_bypass <= 1'b0;
					PE3_round_value <= (blk4x4_intra_calculate_counter == 0)? 5'd0:5'd2; // +2
					PE3_shift_len	<= (blk4x4_intra_calculate_counter == 0)? 3'd0:3'd2; // >>2
				end
				`Intra4x4_Horizontal_Up:	//---horizontal up---
				begin
					PE3_in0 <= (blk4x4_intra_calculate_counter != 0)? Intra_mbAddrA_window3:0;
					PE3_in1 <= 0;	PE3_in2 <= 0;	PE3_in3 <= 0;
					PE3_IsShift 	<= 0;	PE3_IsStore 	<= 0;	PE3_IsClip 	  <= 0;
					PE3_full_bypass <= (blk4x4_intra_calculate_counter != 0)? 1'b1:1'b0;
					PE3_round_value <= 0;	PE3_shift_len <= 0; 
				end
				default:
				begin
					PE3_in0 <= 0;	PE3_in1 <= 0;	PE3_in2 <= 0;	PE3_in3 <= 0;
					PE3_IsShift 	<= 0;	PE3_IsStore 	<= 0;	PE3_IsClip 	  <= 0;
					PE3_full_bypass <= 0;	PE3_round_value <= 0;	PE3_shift_len <= 0;	
				end
			endcase
		//Intra16x16
		else if (mb_type_general[3:2] == 2'b10 && blk4x4_rec_counter < 16)
			case (Intra16x16_predmode)
				`Intra16x16_Vertical:	//---Vertical---
				begin
					case (blk4x4_intra_calculate_counter)
						4:PE3_in0 <= Intra_mbAddrB_window0;
						3:PE3_in0 <= Intra_mbAddrB_window1;
						2:PE3_in0 <= Intra_mbAddrB_window2;
						1:PE3_in0 <= Intra_mbAddrB_window3;
						default:PE3_in0 <= 0;
					endcase
					PE3_in1 		<= 0; 	PE3_in2 		<= 0;	PE3_in3       <= 0; 		
					PE3_IsShift 	<= 0;	PE3_IsStore 	<= 0;	PE3_IsClip 	  <= 0;
					PE3_full_bypass <= 1;	PE3_round_value <= 0;	PE3_shift_len <= 0;
				end
				`Intra16x16_Horizontal:	//---Horizontal---
				begin
					PE3_in0 <= (blk4x4_intra_calculate_counter != 0)? Intra_mbAddrA_window3:0;
					PE3_in1 		<= 0; 	PE3_in2 		<= 0;	PE3_in3 	  <= 0; 		
					PE3_IsShift 	<= 0;	PE3_IsStore 	<= 0;	PE3_IsClip    <= 0;
					PE3_full_bypass <= 1;	PE3_round_value <= 0;	PE3_shift_len <= 0;
				end
				`Intra16x16_DC:			//---DC---
				if (blk4x4_rec_counter == 0)
					case (blk4x4_intra_calculate_counter)
						4:begin		//	M2 + N2 + O2 + P2
							PE3_in0 <= (mbAddrA_availability == 0)? 0:Intra_mbAddrA_reg12;
							PE3_in1 <= (mbAddrA_availability == 0)? 0:Intra_mbAddrA_reg13;
							PE3_in2 <= (mbAddrA_availability == 0)? 0:Intra_mbAddrA_reg14;
							PE3_in3 <= (mbAddrA_availability == 0)? 0:Intra_mbAddrA_reg15;
							PE3_IsShift 	<= 0;	PE3_IsStore 	<= 1;	PE3_IsClip    <= 0;
							PE3_full_bypass <= 0;	PE3_round_value <= 0;	PE3_shift_len <= 0;	end
						3:begin		//	PE3 output + N1 + O1 + P1
							PE3_in0 <= PE3_out_reg;
							PE3_in1 <= (mbAddrB_availability == 0)? 0:Intra_mbAddrB_reg13;
							PE3_in2 <= (mbAddrB_availability == 0)? 0:Intra_mbAddrB_reg14;
							PE3_in3 <= (mbAddrB_availability == 0)? 0:Intra_mbAddrB_reg15;
							PE3_IsShift 	<= 0;	PE3_IsStore 	<= 1;	PE3_IsClip 	  <= 0;
							PE3_full_bypass <= 0;	PE3_round_value <= 0;	PE3_shift_len <= 0;	end
						default:begin
							PE3_in0 <= 0;	PE3_in1 <= 0;	PE3_in2 <= 0;	PE3_in3 <= 0;
							PE3_IsShift 	<= 0;	PE3_IsStore 	<= 0;	PE3_IsClip 	  <= 0;
							PE3_full_bypass <= 0;	PE3_round_value <= 0;	PE3_shift_len <= 0;	end
					endcase
				else
					begin
						PE3_in0 <= 0;	PE3_in1 <= 0;	PE3_in2 <= 0;	PE3_in3 <= 0;
						PE3_IsShift 	<= 0;	PE3_IsStore 	<= 0;	PE3_IsClip 	  <= 0;
						PE3_full_bypass <= 0;	PE3_round_value <= 0;