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[/] [nova/] [trunk/] [src/] [Inter_pred_pipeline.v] - Rev 11
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//-------------------------------------------------------------------------------------------------- // Design : nova // Author(s) : Ke Xu // Email : eexuke@yahoo.com // File : Inter_pred_pipeline.v // Generated : Oct 4, 2005 // Copyright (C) 2008 Ke Xu //------------------------------------------------------------------------------------------------- // Description // Inter prediction pipeline //------------------------------------------------------------------------------------------------- // Revise log // 1.July 23,2006 // Change the ext_frame_RAM from async read to sync read.Therefore,blk4x4_inter_preload_counter has to +1 for all the cases //------------------------------------------------------------------------------------------------- // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "nova_defines.v" module Inter_pred_pipeline (clk,reset_n, mb_num_h,mb_num_v,trigger_blk4x4_inter_pred,blk4x4_rec_counter,mb_type_general_bit3, mv_is16x16,mv_below8x8, mvx_CurrMb0,mvx_CurrMb1,mvx_CurrMb2,mvx_CurrMb3, mvy_CurrMb0,mvy_CurrMb1,mvy_CurrMb2,mvy_CurrMb3, Inter_pix_copy0,Inter_pix_copy1,Inter_pix_copy2,Inter_pix_copy3, LPE0_out,LPE1_out,LPE2_out,LPE3_out, CPE0_out,CPE1_out,CPE2_out,CPE3_out, mv_below8x8_curr,blk4x4_inter_preload_counter,blk4x4_inter_calculate_counter,Inter_chroma2x2_counter, end_of_one_blk4x4_inter,IsInterLuma,IsInterChroma,Is_InterChromaCopy, xInt_addr_unclip,xInt_org_unclip_1to0,pos_FracL,xFracC,yFracC, Inter_pred_out0,Inter_pred_out1,Inter_pred_out2,Inter_pred_out3,Inter_blk4x4_pred_output_valid, ref_frame_RAM_rd,ref_frame_RAM_rd_addr); input clk; input reset_n; input [3:0] mb_num_h,mb_num_v; input trigger_blk4x4_inter_pred; input [4:0] blk4x4_rec_counter; input mb_type_general_bit3; input mv_is16x16; input [3:0] mv_below8x8; input [31:0] mvx_CurrMb0,mvx_CurrMb1,mvx_CurrMb2,mvx_CurrMb3; input [31:0] mvy_CurrMb0,mvy_CurrMb1,mvy_CurrMb2,mvy_CurrMb3; input [7:0] Inter_pix_copy0,Inter_pix_copy1,Inter_pix_copy2,Inter_pix_copy3; input [7:0] LPE0_out,LPE1_out,LPE2_out,LPE3_out; input [7:0] CPE0_out,CPE1_out,CPE2_out,CPE3_out; output mv_below8x8_curr; output [5:0] blk4x4_inter_preload_counter; output [3:0] blk4x4_inter_calculate_counter; output [1:0] Inter_chroma2x2_counter; output end_of_one_blk4x4_inter; output IsInterLuma,IsInterChroma; output Is_InterChromaCopy; output [8:0] xInt_addr_unclip; output [1:0] xInt_org_unclip_1to0; output [3:0] pos_FracL; output [2:0] xFracC,yFracC; output [7:0] Inter_pred_out0,Inter_pred_out1,Inter_pred_out2,Inter_pred_out3; output [1:0] Inter_blk4x4_pred_output_valid; //2'b01:luma output valid 2'b10:chroma output valid output ref_frame_RAM_rd; output [13:0] ref_frame_RAM_rd_addr; reg [5:0] blk4x4_inter_preload_counter; reg [3:0] blk4x4_inter_calculate_counter; reg mv_below8x8_curr; reg [7:0] Inter_pred_out0,Inter_pred_out1,Inter_pred_out2,Inter_pred_out3; reg [1:0] Inter_blk4x4_pred_output_valid; wire ref_frame_RAM_rd; wire IsInterLuma; wire IsInterChroma; wire [1:0] xFracL; wire [1:0] yFracL; wire [2:0] xFracC; wire [2:0] yFracC; wire [13:0] ref_frame_RAM_rd_addr; assign IsInterLuma = (!mb_type_general_bit3 && blk4x4_rec_counter < 16)? 1'b1:1'b0; assign IsInterChroma = (!mb_type_general_bit3 && blk4x4_rec_counter > 15)? 1'b1:1'b0; //------------------------------------------------------------------------- //mv_below8x8_curr for each 2x2 Inter Chroma prediction //------------------------------------------------------------------------- always @ (IsInterLuma or IsInterChroma or blk4x4_rec_counter[3:0] or mv_below8x8) if (IsInterLuma) case (blk4x4_rec_counter[3:2]) 2'b00:mv_below8x8_curr <= mv_below8x8[0]; 2'b01:mv_below8x8_curr <= mv_below8x8[1]; 2'b10:mv_below8x8_curr <= mv_below8x8[2]; 2'b11:mv_below8x8_curr <= mv_below8x8[3]; endcase else if (IsInterChroma) case (blk4x4_rec_counter[1:0]) 2'b00:mv_below8x8_curr <= mv_below8x8[0]; 2'b01:mv_below8x8_curr <= mv_below8x8[1]; 2'b10:mv_below8x8_curr <= mv_below8x8[2]; 2'b11:mv_below8x8_curr <= mv_below8x8[3]; endcase else mv_below8x8_curr <= 0; //---------------------------------------------------------------------------------------- //Inter_chroma2x2_counter to guide the prediction of 2x2 chroma blocks //2'b11 -> 2'b10 -> 2'b01 -> 2'b00 //---------------------------------------------------------------------------------------- reg [1:0] Inter_chroma2x2_counter; always @ (posedge clk) if (reset_n == 1'b0) Inter_chroma2x2_counter <= 0; //mv_below8x8_curr == 1'b1 includes the condition that "blk4x4_rec_counter > 15" else if (IsInterChroma && trigger_blk4x4_inter_pred && mv_below8x8_curr) Inter_chroma2x2_counter <= 2'b11; else if (blk4x4_inter_calculate_counter == 4'd1 && Inter_chroma2x2_counter != 0) Inter_chroma2x2_counter <= Inter_chroma2x2_counter - 1; //---------------------------------------------------------------------------------------- //trigger_blk2x2_inter_pred:only for chroma 2x2 decoding //We introduce this additional signal since we need Inter_chroma2x2_counter to update //one cycle before blk4x4_inter_calculate_counter //---------------------------------------------------------------------------------------- reg trigger_blk2x2_inter_pred; always @ (posedge clk) if (reset_n == 1'b0) trigger_blk2x2_inter_pred <= 0; else if ((IsInterChroma && trigger_blk4x4_inter_pred && mv_below8x8_curr) || (blk4x4_inter_calculate_counter == 4'd1 && Inter_chroma2x2_counter != 0)) trigger_blk2x2_inter_pred <= 1'b1; else trigger_blk2x2_inter_pred <= 1'b0; //---------------------------------------------------------------------------------------- //Inter motion vector for current 4x4 luma/chroma block or 2x2 chroma block // Inter_blk_mvx,Inter_blk_mvy //---------------------------------------------------------------------------------------- reg [7:0] Inter_blk_mvx,Inter_blk_mvy; always @ (blk4x4_rec_counter or mv_below8x8_curr or Inter_chroma2x2_counter or IsInterLuma or IsInterChroma or mv_is16x16 or mvx_CurrMb0 or mvx_CurrMb1 or mvx_CurrMb2 or mvx_CurrMb3 or mvy_CurrMb0 or mvy_CurrMb1 or mvy_CurrMb2 or mvy_CurrMb3) //Inter luma if (IsInterLuma) begin if (mv_is16x16) begin Inter_blk_mvx <= mvx_CurrMb0[7:0]; Inter_blk_mvy <= mvy_CurrMb0[7:0]; end else case (mv_below8x8_curr) 1'b0: case (blk4x4_rec_counter[3:2]) 2'b00:begin Inter_blk_mvx <= mvx_CurrMb0[7:0]; Inter_blk_mvy <= mvy_CurrMb0[7:0]; end 2'b01:begin Inter_blk_mvx <= mvx_CurrMb1[7:0]; Inter_blk_mvy <= mvy_CurrMb1[7:0]; end 2'b10:begin Inter_blk_mvx <= mvx_CurrMb2[7:0]; Inter_blk_mvy <= mvy_CurrMb2[7:0]; end 2'b11:begin Inter_blk_mvx <= mvx_CurrMb3[7:0]; Inter_blk_mvy <= mvy_CurrMb3[7:0]; end endcase 1'b1: case (blk4x4_rec_counter) 0 :begin Inter_blk_mvx <= mvx_CurrMb0[7:0]; Inter_blk_mvy <= mvy_CurrMb0[7:0]; end 1 :begin Inter_blk_mvx <= mvx_CurrMb0[15:8]; Inter_blk_mvy <= mvy_CurrMb0[15:8]; end 2 :begin Inter_blk_mvx <= mvx_CurrMb0[23:16];Inter_blk_mvy <= mvy_CurrMb0[23:16]; end 3 :begin Inter_blk_mvx <= mvx_CurrMb0[31:24];Inter_blk_mvy <= mvy_CurrMb0[31:24]; end 4 :begin Inter_blk_mvx <= mvx_CurrMb1[7:0]; Inter_blk_mvy <= mvy_CurrMb1[7:0]; end 5 :begin Inter_blk_mvx <= mvx_CurrMb1[15:8]; Inter_blk_mvy <= mvy_CurrMb1[15:8]; end 6 :begin Inter_blk_mvx <= mvx_CurrMb1[23:16];Inter_blk_mvy <= mvy_CurrMb1[23:16]; end 7 :begin Inter_blk_mvx <= mvx_CurrMb1[31:24];Inter_blk_mvy <= mvy_CurrMb1[31:24]; end 8 :begin Inter_blk_mvx <= mvx_CurrMb2[7:0]; Inter_blk_mvy <= mvy_CurrMb2[7:0]; end 9 :begin Inter_blk_mvx <= mvx_CurrMb2[15:8]; Inter_blk_mvy <= mvy_CurrMb2[15:8]; end 10:begin Inter_blk_mvx <= mvx_CurrMb2[23:16];Inter_blk_mvy <= mvy_CurrMb2[23:16]; end 11:begin Inter_blk_mvx <= mvx_CurrMb2[31:24];Inter_blk_mvy <= mvy_CurrMb2[31:24]; end 12:begin Inter_blk_mvx <= mvx_CurrMb3[7:0]; Inter_blk_mvy <= mvy_CurrMb3[7:0]; end 13:begin Inter_blk_mvx <= mvx_CurrMb3[15:8]; Inter_blk_mvy <= mvy_CurrMb3[15:8]; end 14:begin Inter_blk_mvx <= mvx_CurrMb3[23:16];Inter_blk_mvy <= mvy_CurrMb3[23:16]; end 15:begin Inter_blk_mvx <= mvx_CurrMb3[31:24];Inter_blk_mvy <= mvy_CurrMb3[31:24]; end default:begin Inter_blk_mvx <= 0;Inter_blk_mvy <= 0; end endcase endcase end //Inter chroma else if (IsInterChroma) begin if (mv_is16x16) begin Inter_blk_mvx <= mvx_CurrMb0[7:0]; Inter_blk_mvy <= mvy_CurrMb0[7:0]; end else case (blk4x4_rec_counter[1:0]) 2'b00: if (mv_below8x8_curr) //chroma2x2 prediction case (Inter_chroma2x2_counter) 3:begin Inter_blk_mvx <= mvx_CurrMb0[7:0]; Inter_blk_mvy <= mvy_CurrMb0[7:0]; end 2:begin Inter_blk_mvx <= mvx_CurrMb0[15:8]; Inter_blk_mvy <= mvy_CurrMb0[15:8]; end 1:begin Inter_blk_mvx <= mvx_CurrMb0[23:16];Inter_blk_mvy <= mvy_CurrMb0[23:16]; end 0:begin Inter_blk_mvx <= mvx_CurrMb0[31:24];Inter_blk_mvy <= mvy_CurrMb0[31:24]; end endcase else //chroma 4x4 prediction begin Inter_blk_mvx <= mvx_CurrMb0[7:0]; Inter_blk_mvy <= mvy_CurrMb0[7:0]; end 2'b01: if (mv_below8x8_curr) //need chroma2x2 prediction case (Inter_chroma2x2_counter) 3:begin Inter_blk_mvx <= mvx_CurrMb1[7:0]; Inter_blk_mvy <= mvy_CurrMb1[7:0]; end 2:begin Inter_blk_mvx <= mvx_CurrMb1[15:8]; Inter_blk_mvy <= mvy_CurrMb1[15:8]; end 1:begin Inter_blk_mvx <= mvx_CurrMb1[23:16];Inter_blk_mvy <= mvy_CurrMb1[23:16]; end 0:begin Inter_blk_mvx <= mvx_CurrMb1[31:24];Inter_blk_mvy <= mvy_CurrMb1[31:24]; end endcase else //chroma 4x4 prediction begin Inter_blk_mvx <= mvx_CurrMb1[7:0]; Inter_blk_mvy <= mvy_CurrMb1[7:0]; end 2'b10: if (mv_below8x8_curr) //chroma2x2 prediction case (Inter_chroma2x2_counter) 3:begin Inter_blk_mvx <= mvx_CurrMb2[7:0]; Inter_blk_mvy <= mvy_CurrMb2[7:0]; end 2:begin Inter_blk_mvx <= mvx_CurrMb2[15:8]; Inter_blk_mvy <= mvy_CurrMb2[15:8]; end 1:begin Inter_blk_mvx <= mvx_CurrMb2[23:16];Inter_blk_mvy <= mvy_CurrMb2[23:16]; end 0:begin Inter_blk_mvx <= mvx_CurrMb2[31:24];Inter_blk_mvy <= mvy_CurrMb2[31:24]; end endcase else //chroma 4x4 prediction begin Inter_blk_mvx <= mvx_CurrMb2[7:0]; Inter_blk_mvy <= mvy_CurrMb2[7:0]; end 2'b11: if (mv_below8x8_curr) //chroma2x2 prediction case (Inter_chroma2x2_counter) 3:begin Inter_blk_mvx <= mvx_CurrMb3[7:0]; Inter_blk_mvy <= mvy_CurrMb3[7:0]; end 2:begin Inter_blk_mvx <= mvx_CurrMb3[15:8]; Inter_blk_mvy <= mvy_CurrMb3[15:8]; end 1:begin Inter_blk_mvx <= mvx_CurrMb3[23:16];Inter_blk_mvy <= mvy_CurrMb3[23:16]; end 0:begin Inter_blk_mvx <= mvx_CurrMb3[31:24];Inter_blk_mvy <= mvy_CurrMb3[31:24]; end endcase else //chroma 4x4 prediction begin Inter_blk_mvx <= mvx_CurrMb3[7:0]; Inter_blk_mvy <= mvy_CurrMb3[7:0]; end endcase end else begin Inter_blk_mvx <= 0; Inter_blk_mvy <= 0; end //---------------------------------------------------------------------------------------- //Describes the offset of each blk4x4 inside a MB //---------------------------------------------------------------------------------------- // xOffset = 0 for 0,2,8, 10 yOffset = 0 for 0, 1, 4, 5 // xOffset = 4 for 1,3,9, 11 yOffset = 4 for 2, 3, 6, 7 // xOffset = 8 for 4,6,12,14 yOffset = 8 for 8, 9, 12,13 // xOffset = 12 for 5,7,13,15 yOffset = 12 for 10,11,14,15 reg [3:0] xOffsetL,yOffsetL; always @ (IsInterLuma or mv_below8x8_curr or blk4x4_rec_counter[2] or blk4x4_rec_counter[0]) if (IsInterLuma) begin if (!mv_below8x8_curr) xOffsetL <= (blk4x4_rec_counter[2])? 4'd8:4'd0; else case ({blk4x4_rec_counter[2],blk4x4_rec_counter[0]}) 2'b00:xOffsetL <= 4'd0; 2'b01:xOffsetL <= 4'd4; 2'b10:xOffsetL <= 4'd8; 2'b11:xOffsetL <= 4'd12; endcase end else xOffsetL <= 0; always @ (IsInterLuma or mv_below8x8_curr or blk4x4_rec_counter[3] or blk4x4_rec_counter[1]) if (IsInterLuma) begin if (!mv_below8x8_curr) yOffsetL <= (blk4x4_rec_counter[3])? 4'd8:4'd0; else case ({blk4x4_rec_counter[3],blk4x4_rec_counter[1]}) 2'b00:yOffsetL <= 4'd0; 2'b01:yOffsetL <= 4'd4; 2'b10:yOffsetL <= 4'd8; 2'b11:yOffsetL <= 4'd12; endcase end else yOffsetL <= 0; reg [2:0] xOffsetC,yOffsetC; always @ (IsInterChroma or mv_below8x8_curr or blk4x4_rec_counter[0] or Inter_chroma2x2_counter[0]) if (IsInterChroma) begin if (mv_below8x8_curr == 1'b0) xOffsetC <= (blk4x4_rec_counter[0] == 1'b0)? 3'd0:3'd4; else case (blk4x4_rec_counter[0]) 1'b0:xOffsetC <= (Inter_chroma2x2_counter[0] == 1'b1)? 3'd0:3'd2; 1'b1:xOffsetC <= (Inter_chroma2x2_counter[0] == 1'b1)? 3'd4:3'd6; endcase end else xOffsetC <= 0; always @ (IsInterChroma or mv_below8x8_curr or blk4x4_rec_counter[1] or Inter_chroma2x2_counter[1]) if (IsInterChroma) begin if (mv_below8x8_curr == 1'b0) yOffsetC <= (blk4x4_rec_counter[1] == 1'b0)? 3'd0:3'd4; else case (blk4x4_rec_counter[1]) 1'b0:yOffsetC <= (Inter_chroma2x2_counter[1] == 1'b1)? 3'd0:3'd2; 1'b1:yOffsetC <= (Inter_chroma2x2_counter[1] == 1'b1)? 3'd4:3'd6; endcase end else yOffsetC <= 3'd0; //---------------------------------------------------------------------------------------- //Integer position of each left-up-most pixel of a 8x8/4x4/2x2 blk //---------------------------------------------------------------------------------------- wire [8:0] xIntL_unclip,yIntL_unclip; // 2's complement,bit[8] is the sign bit wire [7:0] xIntC_unclip,yIntC_unclip; // 2's complement,bit[7] is the sign bit assign xIntL_unclip = (IsInterLuma)? ({1'b0,mb_num_h,4'b0} + xOffsetL + {{3{Inter_blk_mvx[7]}},Inter_blk_mvx[7:2]}):0; assign yIntL_unclip = (IsInterLuma)? ({1'b0,mb_num_v,4'b0} + yOffsetL + {{3{Inter_blk_mvy[7]}},Inter_blk_mvy[7:2]}):0; assign xIntC_unclip = (IsInterChroma)? ({1'b0,mb_num_h,3'b0} + xOffsetC + {{3{Inter_blk_mvx[7]}},Inter_blk_mvx[7:3]}):0; assign yIntC_unclip = (IsInterChroma)? ({1'b0,mb_num_v,3'b0} + yOffsetC + {{3{Inter_blk_mvy[7]}},Inter_blk_mvy[7:3]}):0; wire [8:0] xInt_org_unclip; wire [8:0] yInt_org_unclip; assign xInt_org_unclip = (IsInterLuma)? xIntL_unclip:{xIntC_unclip[7],xIntC_unclip}; assign yInt_org_unclip = (IsInterLuma)? yIntL_unclip:{yIntC_unclip[7],yIntC_unclip}; assign xInt_org_unclip_1to0 = xInt_org_unclip[1:0]; //---------------------------------------------------------------------------------------- //Fractional motion vector for both luma and chroma //---------------------------------------------------------------------------------------- wire [3:0] pos_FracL; wire Is_InterChromaCopy;//If chroma is predicted by direct copy,calculate cycle would reduce //from 16 cycles to 4 cycles assign xFracL = (IsInterLuma)? Inter_blk_mvx[1:0]:0; assign yFracL = (IsInterLuma)? Inter_blk_mvy[1:0]:0; assign xFracC = (IsInterChroma)? Inter_blk_mvx[2:0]:0; assign yFracC = (IsInterChroma)? Inter_blk_mvy[2:0]:0; assign pos_FracL = {xFracL,yFracL}; assign Is_InterChromaCopy = (IsInterChroma && xFracC == 0 && yFracC == 0)? 1'b1:1'b0; //---------------------------------------------------------------------------------------- //Inter prediction step control counter //---------------------------------------------------------------------------------------- //1.Preload integer pels counter // If block partition equals 8x8 or above,preload only at first 4x4 block of each 8x8block // If block partition is 8x4,4x8 or 4x4, preload at each 4x4 block always @ (posedge clk) if (reset_n == 1'b0) blk4x4_inter_preload_counter <= 0; //luma else if (trigger_blk4x4_inter_pred && IsInterLuma) begin if (!mv_below8x8_curr && blk4x4_rec_counter[1:0] == 2'b00) case (pos_FracL) `pos_Int :blk4x4_inter_preload_counter <= (xInt_org_unclip[1:0] == 2'b00)? 6'd17:6'd25; `pos_f,`pos_q,`pos_i,`pos_k,`pos_j:blk4x4_inter_preload_counter <= 6'd53; `pos_d,`pos_h,`pos_n :blk4x4_inter_preload_counter <= (xInt_org_unclip[1:0] == 2'b00)? 6'd27:6'd40; `pos_a,`pos_b,`pos_c :blk4x4_inter_preload_counter <= 6'd33; `pos_e,`pos_g,`pos_p,`pos_r :blk4x4_inter_preload_counter <= 6'd49; endcase else if (mv_below8x8_curr) //partition below 8x8block case (pos_FracL) `pos_Int :blk4x4_inter_preload_counter <= (xInt_org_unclip[1:0] == 2'b00)? 6'd5:6'd9; `pos_f,`pos_q,`pos_i,`pos_k,`pos_j:blk4x4_inter_preload_counter <= 6'd28; `pos_d,`pos_h,`pos_n :blk4x4_inter_preload_counter <= (xInt_org_unclip[1:0] == 2'b00)? 6'd10:6'd19; `pos_a,`pos_b,`pos_c :blk4x4_inter_preload_counter <= 6'd13; `pos_e,`pos_g,`pos_p,`pos_r :blk4x4_inter_preload_counter <= 6'd24; endcase end //chroma else if (trigger_blk4x4_inter_pred && IsInterChroma && mv_below8x8_curr == 1'b0) begin if (xFracC == 0 && yFracC == 0) blk4x4_inter_preload_counter <= (xInt_org_unclip[1:0] == 2'b00)? 6'd5:6'd9; else blk4x4_inter_preload_counter <= 6'd11; end else if (trigger_blk2x2_inter_pred && IsInterChroma && mv_below8x8_curr == 1'b1) begin if (xFracC == 0 && yFracC == 0) blk4x4_inter_preload_counter <= (xInt_org_unclip[1:0] == 2'b11)? 6'd5:6'd3; else blk4x4_inter_preload_counter <= (xInt_org_unclip[1] == 1'b0 )? 6'd4:6'd7; end else if (blk4x4_inter_preload_counter != 0) blk4x4_inter_preload_counter <= blk4x4_inter_preload_counter - 1; //2.Calculate counter always @ (posedge clk) if (reset_n == 1'b0) blk4x4_inter_calculate_counter <= 0; //luma else if (IsInterLuma && ((!mv_below8x8_curr && ( (blk4x4_rec_counter[1:0] == 2'b00 && blk4x4_inter_preload_counter == 1) || (blk4x4_rec_counter[1:0] != 2'b00 && trigger_blk4x4_inter_pred))) || (mv_below8x8_curr && blk4x4_inter_preload_counter == 1))) case (pos_FracL) `pos_j,`pos_f,`pos_q:blk4x4_inter_calculate_counter <= 4'd5; `pos_i,`pos_k :blk4x4_inter_calculate_counter <= 4'd8; default :blk4x4_inter_calculate_counter <= 4'd4; endcase //chroma else if (blk4x4_inter_preload_counter == 1 && IsInterChroma == 1'b1) case (mv_below8x8_curr) 1'b0:blk4x4_inter_calculate_counter <= 4'd4; 1'b1:blk4x4_inter_calculate_counter <= 4'd1; endcase else if (blk4x4_inter_calculate_counter != 0) blk4x4_inter_calculate_counter <= blk4x4_inter_calculate_counter - 1; assign end_of_one_blk4x4_inter = (blk4x4_inter_calculate_counter == 4'd1 && ((IsInterChroma && mv_below8x8_curr && Inter_chroma2x2_counter == 2'b00) || !(IsInterChroma && mv_below8x8_curr))); //---------------------------------------------------------------------------------------- //Inter prediction reference frame RAM read control //---------------------------------------------------------------------------------------- assign ref_frame_RAM_rd = ((IsInterLuma || IsInterChroma) && blk4x4_inter_preload_counter != 6'd0 && blk4x4_inter_preload_counter != 6'd1); //compared with blk4x4_inter_preload_counter,blk4x4_inter_preload_counter_m2 has some advantages //during some pos_FracL for vertical memory address decoding wire [5:0] blk4x4_inter_preload_counter_m2; assign blk4x4_inter_preload_counter_m2 = (blk4x4_inter_preload_counter == 6'd0 || blk4x4_inter_preload_counter == 6'd1)? 6'd0:(blk4x4_inter_preload_counter - 2); //xInt_curr_offset: offset from the left-upper most pixel of current block,ranging -2 ~ +10. //After each preload cycle,xInt_curr_offset will increase 4 reg [4:0] xInt_curr_offset; always @ (IsInterLuma or mv_below8x8_curr or pos_FracL or xFracC or yFracC or xInt_org_unclip[1:0] or blk4x4_inter_preload_counter_m2 or blk4x4_inter_preload_counter) if (blk4x4_inter_preload_counter != 6'd0 && blk4x4_inter_preload_counter != 6'd1) begin if (IsInterLuma) begin if (!mv_below8x8_curr) case (pos_FracL) `pos_f,`pos_q,`pos_i,`pos_k,`pos_j: case (blk4x4_inter_preload_counter_m2[1:0]) 2'b00:xInt_curr_offset <= 5'b01010; //+10 2'b01:xInt_curr_offset <= 5'b00110; //+6 2'b10:xInt_curr_offset <= 5'b00010; //+2 2'b11:xInt_curr_offset <= 5'b11110; //-2 endcase `pos_d,`pos_h,`pos_n: if (xInt_org_unclip[1:0] == 2'b00) xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0])? 4'b0:4'b0100; //+0 or +4 else case (blk4x4_inter_preload_counter_m2) 6'd38,6'd35,6'd32,6'd29,6'd26,6'd23,6'd20,6'd17,6'd14,6'd11,6'd8,6'd5,6'd2: xInt_curr_offset <= 5'b0; //+0 6'd37,6'd34,6'd31,6'd28,6'd25,6'd22,6'd19,6'd16,6'd13,6'd10,6'd7,6'd4,6'd1: xInt_curr_offset <= 5'b00100; //+4 default:xInt_curr_offset <= 5'b01000;//+8 endcase `pos_a,`pos_b,`pos_c: case (blk4x4_inter_preload_counter_m2[1:0]) 2'b00:xInt_curr_offset <= 5'b01010; //+10 2'b01:xInt_curr_offset <= 5'b00110; //+6 2'b10:xInt_curr_offset <= 5'b00010; //+2 2'b11:xInt_curr_offset <= 5'b11110; //-2 endcase `pos_Int: if (xInt_org_unclip[1:0] == 2'b00) xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0])? 5'b0:5'b0100; //+0 or +4 else case (blk4x4_inter_preload_counter_m2) 6'd23,6'd20,6'd17,6'd14,6'd11,6'd8,6'd5,6'd2: xInt_curr_offset <= 5'b00000; //+0 6'd22,6'd19,6'd16,6'd13,6'd10,6'd7,6'd4,6'd1: xInt_curr_offset <= 5'b00100; //+4 default:xInt_curr_offset <= 5'b01000;//+8 endcase `pos_e,`pos_g,`pos_p,`pos_r: case (blk4x4_inter_preload_counter_m2) 6'd47,6'd44,6'd5,6'd2: xInt_curr_offset <= 5'b00000; //+0 6'd46,6'd43,6'd4,6'd1: xInt_curr_offset <= 5'b00100; //+4 6'd45,6'd42,6'd3,6'd0: xInt_curr_offset <= 5'b01000; //+8 default: case (blk4x4_inter_preload_counter_m2[1:0]) 2'b00:xInt_curr_offset <= 5'b00010; //+2 2'b01:xInt_curr_offset <= 5'b11110; //-2 2'b10:xInt_curr_offset <= 5'b01010; //+10 2'b11:xInt_curr_offset <= 5'b00110; //+6 endcase endcase endcase else //block partition below 8x8 case (pos_FracL) `pos_f,`pos_q,`pos_i,`pos_k,`pos_j: case (blk4x4_inter_preload_counter_m2) 6'd26,6'd23,6'd20,6'd17,6'd14,6'd11,6'd8,6'd5,6'd2:xInt_curr_offset <= 5'b11110;//-2 6'd25,6'd22,6'd19,6'd16,6'd13,6'd10,6'd7,6'd4,6'd1:xInt_curr_offset <= 5'b00010;//+2 default:xInt_curr_offset <= 5'b00110; //+6 endcase `pos_d,`pos_h,`pos_n: if (xInt_org_unclip[1:0] == 2'b00) xInt_curr_offset <= 5'b0; //+0 else xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0])? 5'b0:5'b00100;//+0 or +4 `pos_a,`pos_b,`pos_c: case (blk4x4_inter_preload_counter_m2) 6'd11,6'd8,6'd5,6'd2:xInt_curr_offset <= 5'b11110; //-2 6'd10,6'd7,6'd4,6'd1:xInt_curr_offset <= 5'b00010; //+2 default:xInt_curr_offset <= 5'b00110; //+6 endcase `pos_Int: if (xInt_org_unclip[1:0] == 2'b00) xInt_curr_offset <= 5'b0; //+0 else xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0])? 5'b0:5'b00100; //+0 or +4 `pos_e,`pos_g,`pos_p,`pos_r: case (blk4x4_inter_preload_counter_m2) 6'd22,6'd20,6'd3,6'd1:xInt_curr_offset <= 5'b0; //+0 6'd21,6'd19,6'd2,6'd0:xInt_curr_offset <= 5'b00100; //+4 6'd18,6'd15,6'd12,6'd9,6'd6:xInt_curr_offset <= 5'b11110;//-2 6'd17,6'd14,6'd11,6'd8,6'd5:xInt_curr_offset <= 5'b00010;//+2 6'd16,6'd13,6'd10,6'd7,6'd4:xInt_curr_offset <= 5'b00110;//+6 default:xInt_curr_offset <= 5'b0; endcase endcase end else //IsInterChroma begin if (!mv_below8x8_curr) begin if (xFracC == 0 && yFracC == 0) begin if (xInt_org_unclip[1:0] == 2'b00) xInt_curr_offset <= 5'b0; else xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0] == 1'b1)? 5'b0:5'b0100; end else xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0] == 1'b1)? 5'b0:5'b0100; end else //mv_below8x8_curr == 1'b1 begin if (xFracC == 0 && yFracC == 0) begin if (xInt_org_unclip[1:0] == 2'b11) // 4 preload cycles xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0] == 1'b1)? 5'b0:5'b0100; else xInt_curr_offset <= 0; end else begin if (xInt_org_unclip[1] == 1'b0) xInt_curr_offset <= 0; else xInt_curr_offset <= (blk4x4_inter_preload_counter_m2[0] == 1'b1)? 5'b0:5'b0100; end end end end else //blk4x4_inter_preload_counter == 0 || blk4x4_inter_preload_counter == 1 xInt_curr_offset <= 5'b0; //Derive unclipped x pos for each preload cycle wire [8:0] xInt_addr_unclip; assign xInt_addr_unclip = xInt_org_unclip + {{4{xInt_curr_offset[4]}},xInt_curr_offset}; //x addr clipped:x address in pixels reg [7:0] xInt_addr; always @ (xInt_addr_unclip or IsInterLuma or IsInterChroma) if (xInt_addr_unclip[8] == 1'b1) //negative xInt_addr <= 0; else if (IsInterLuma) xInt_addr <= (xInt_addr_unclip[7:0] > (`pic_width - 4))? 8'd172:xInt_addr_unclip[7:0]; else if (IsInterChroma) xInt_addr <= (xInt_addr_unclip[7:0] > (`half_pic_width - 4))? 8'd84:xInt_addr_unclip[7:0]; else xInt_addr <= 0; //yInt_p1:when loading from Xth line to (X-1)th line,yInt_p1 is set to 1'b1 at the last //loading cycle of current Xth line reg yInt_p1; always @ (IsInterLuma or mv_below8x8_curr or pos_FracL or xFracC or yFracC or blk4x4_inter_preload_counter or blk4x4_inter_preload_counter_m2 or xInt_org_unclip[1:0] or xInt_org_unclip[1]) if (blk4x4_inter_preload_counter != 6'd0 && blk4x4_inter_preload_counter != 6'd1) begin if (IsInterLuma) case (mv_below8x8_curr) 1'b0: case (pos_FracL) `pos_f,`pos_q,`pos_i,`pos_k,`pos_j: yInt_p1 <= (blk4x4_inter_preload_counter_m2[1:0] == 2'b00)? 1'b1:1'b0; `pos_d,`pos_h,`pos_n: if (xInt_org_unclip[1:0] == 2'b00) yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; else case (blk4x4_inter_preload_counter_m2) 6'd36,6'd33,6'd30,6'd27,6'd24,6'd21,6'd18,6'd15,6'd12,6'd9,6'd6,6'd3,6'd0: yInt_p1 <= 1'b1; default:yInt_p1 <= 1'b0; endcase `pos_a,`pos_b,`pos_c: yInt_p1 <= (blk4x4_inter_preload_counter_m2[1:0] == 2'b00)? 1'b1:1'b0; `pos_Int: if (xInt_org_unclip[1:0] == 2'b00) yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; else case (blk4x4_inter_preload_counter_m2) 6'd21,6'd18,6'd15,6'd12,6'd9,6'd6,6'd3,6'd0:yInt_p1 <= 1'b1; default: yInt_p1 <= 1'b0; endcase `pos_e,`pos_g,`pos_p,`pos_r: case (blk4x4_inter_preload_counter_m2) 6'd45,6'd42,6'd3,6'd0:yInt_p1 <= 1'b1; 6'd6,6'd10,6'd14,6'd18,6'd22,6'd26,6'd30,6'd34,6'd38:yInt_p1 <= 1'b1; default:yInt_p1 <= 1'b0; endcase endcase 1'b1: //block partition below 8x8 case (pos_FracL) `pos_f,`pos_q,`pos_i,`pos_k,`pos_j: case (blk4x4_inter_preload_counter_m2) 6'd24,6'd21,6'd18,6'd15,6'd12,6'd9,6'd6,6'd3,6'd0:yInt_p1 <= 1'b1; default:yInt_p1 <= 1'b0; endcase `pos_d,`pos_h,`pos_n: if (xInt_org_unclip[1:0] == 2'b00) yInt_p1 <= 1'b1; else yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; `pos_a,`pos_b,`pos_c: case (blk4x4_inter_preload_counter_m2) 5'd9,5'd6,5'd3,5'd0 :yInt_p1 <= 1'b1; default :yInt_p1 <= 1'b0; endcase `pos_Int: if (xInt_org_unclip[1:0] == 2'b00) yInt_p1 <= 1'b1; else yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; `pos_e,`pos_g,`pos_p,`pos_r: case (blk4x4_inter_preload_counter_m2) 6'd21,6'd19,6'd2,6'd0 :yInt_p1 <= 1'b1; 6'd4,6'd7,6'd10,6'd13,6'd16 :yInt_p1 <= 1'b1; default :yInt_p1 <= 1'b0; endcase endcase endcase else //IsInterChroma case (mv_below8x8_curr) 1'b0: if (xFracC == 0 && yFracC == 0) begin if (xInt_org_unclip[1:0] == 2'b00) yInt_p1 <= 1'b1; else yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; end else yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; 1'b1: if (xFracC == 0 && yFracC == 0) begin if (xInt_org_unclip[1:0] != 2'b11) yInt_p1 <= 1'b1; else yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; end else begin if (xInt_org_unclip[1] == 1'b0) yInt_p1 <= 1'b1; else yInt_p1 <= (blk4x4_inter_preload_counter_m2[0] == 1'b0)? 1'b1:1'b0; end endcase end else // blk4x4_inter_preload_counter == 0 || blk4x4_inter_preload_counter == 1 yInt_p1 <= 1'b0; //Derive unclipped y pos for each preload cycle reg [8:0] yInt_addr_unclip; always @ (posedge clk) if (reset_n == 1'b0) yInt_addr_unclip <= 0; else if ((IsInterLuma && (trigger_blk4x4_inter_pred && (mv_below8x8_curr || (!mv_below8x8_curr && blk4x4_rec_counter[1:0] == 2'b00)))) || (IsInterChroma && (!mv_below8x8_curr && trigger_blk4x4_inter_pred) || (mv_below8x8_curr && trigger_blk2x2_inter_pred))) begin if (IsInterLuma) //Luma case (pos_FracL) `pos_a,`pos_b,`pos_c,`pos_Int: yInt_addr_unclip <= yInt_org_unclip; default: //need -2 here yInt_addr_unclip <= yInt_org_unclip + 9'b111111110; endcase else //Chroma yInt_addr_unclip <= yInt_org_unclip; end else if (blk4x4_inter_preload_counter_m2 != 0 && yInt_p1 == 1'b1) yInt_addr_unclip <= yInt_addr_unclip + 1; //y addr clipped reg [7:0] yInt_addr; always @ (yInt_addr_unclip or IsInterLuma or IsInterChroma) if (yInt_addr_unclip[8] == 1'b1) //negative yInt_addr <= 0; else if (IsInterLuma) yInt_addr <= (yInt_addr_unclip[7:0] > (`pic_height - 1))? 8'd143:yInt_addr_unclip[7:0]; else if (IsInterChroma) yInt_addr <= (yInt_addr_unclip[7:0] > (`half_pic_height - 1))? 8'd71:yInt_addr_unclip[7:0]; else yInt_addr <= 0; wire [12:0] offset_constant; wire [10:0] yInt_addr_x11; wire [12:0] offset_yInt_addr; assign offset_constant = (IsInterLuma)? 0:((IsInterChroma)? ((blk4x4_rec_counter < 5'd20)? 13'd6336:13'd7920):0); assign yInt_addr_x11 = {yInt_addr,3'b0} + {2'b0,yInt_addr,1'b0} + {3'b0,yInt_addr}; assign offset_yInt_addr = (IsInterLuma)? {yInt_addr_x11,2'b0}:{1'b0,yInt_addr_x11,1'b0}; assign ref_frame_RAM_rd_addr = (offset_constant + {8'b0,xInt_addr[7:2]}) + {1'b0,offset_yInt_addr}; //---------------------------------------------------------------------------------------- //Inter prediction output control: from LPE or from CPE //---------------------------------------------------------------------------------------- always @ (IsInterLuma or IsInterChroma or Is_InterChromaCopy or blk4x4_inter_calculate_counter or pos_FracL or Inter_pix_copy0 or Inter_pix_copy1 or Inter_pix_copy2 or Inter_pix_copy3 or LPE0_out or LPE1_out or LPE2_out or LPE3_out or CPE0_out or CPE1_out or CPE2_out or CPE3_out) if (IsInterLuma && blk4x4_inter_calculate_counter != 0) begin Inter_blk4x4_pred_output_valid <= 2'b01; case (pos_FracL) `pos_Int: begin Inter_pred_out0 <= Inter_pix_copy0;Inter_pred_out1 <= Inter_pix_copy1; Inter_pred_out2 <= Inter_pix_copy2;Inter_pred_out3 <= Inter_pix_copy3; end `pos_i,`pos_k: if (blk4x4_inter_calculate_counter == 4'd7 || blk4x4_inter_calculate_counter == 4'd5 || blk4x4_inter_calculate_counter == 4'd3 || blk4x4_inter_calculate_counter == 4'd1) begin Inter_pred_out0 <= LPE0_out;Inter_pred_out1 <= LPE1_out; Inter_pred_out2 <= LPE2_out;Inter_pred_out3 <= LPE3_out; end else begin Inter_pred_out0 <= 0;Inter_pred_out1 <= 0;Inter_pred_out2 <= 0;Inter_pred_out3 <= 0; end default: if (blk4x4_inter_calculate_counter == 4'd4 || blk4x4_inter_calculate_counter == 4'd3 || blk4x4_inter_calculate_counter == 4'd2 || blk4x4_inter_calculate_counter == 4'd1) begin Inter_pred_out0 <= LPE0_out;Inter_pred_out1 <= LPE1_out; Inter_pred_out2 <= LPE2_out;Inter_pred_out3 <= LPE3_out; end else begin Inter_pred_out0 <= 0;Inter_pred_out1 <= 0;Inter_pred_out2 <= 0;Inter_pred_out3 <= 0; end endcase end else if (IsInterChroma && blk4x4_inter_calculate_counter != 0) begin Inter_pred_out0 <= (Is_InterChromaCopy)? Inter_pix_copy0:CPE0_out; Inter_pred_out1 <= (Is_InterChromaCopy)? Inter_pix_copy1:CPE1_out; Inter_pred_out2 <= (Is_InterChromaCopy)? Inter_pix_copy2:CPE2_out; Inter_pred_out3 <= (Is_InterChromaCopy)? Inter_pix_copy3:CPE3_out; Inter_blk4x4_pred_output_valid <= 2'b10; end else begin Inter_pred_out0 <= 0;Inter_pred_out1 <= 0;Inter_pred_out2 <= 0;Inter_pred_out3 <= 0; Inter_blk4x4_pred_output_valid <= 2'b00; end endmodule