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[/] [nova/] [tags/] [Start/] [src/] [end_of_blk_decoding.v] - Rev 3
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//-------------------------------------------------------------------------------------------------- // Design : nova // Author(s) : Ke Xu // Email : eexuke@yahoo.com // File : end_of_blk_decoding.v // Generated : June 12, 2005 // Copyright (C) 2008 Ke Xu //------------------------------------------------------------------------------------------------- // Description // Decoding end_of_one_residual_block signal for 1 cycle duration // 1)for BitStream_parser_FSM to update signals such as i4x4 and direct state switch // 2)for nC_decoding to update LumaLevel/ChromaLevel CurrMb,mbAddrA,mbAddrB // Decoding end_of_residual signal for 1 cycle duration // 1)for nC_decoding to update general control regs such as Luma_8x8_AllZeroCoeff_mbAddrA,Luma_8x8_AllZeroCoeff_mbAddrB_reg,Chroma_8x8_AllZeroCoeff_mbAddrA,Chroma_8x8_AllZeroCoeff_mbAddrB_reg // 2)Note:for P_skip MBs,their general control regs as *8x8_ALLZeroCoeff* are directly controlled by the state instead of end_of_residual signal //------------------------------------------------------------------------------------------------- // Revise log // 1. March 24,2006 // Add signal end_of_NonZeroCoeff_CAVLC for IQIT to update res_AC/res_DC/... signals. // end_of_NonZeroCoeff_CAVLC:combinational logic,active one cycle at the end of CAVLC decoding of one non zero coefficient residual. // 2. March 29,2006 // Add signal lumaDC_IsAllZero,ChromaDC_Cb_IsAllZero,ChromaDC_Cr_IsAllZero to deal with special case:zero DC coeff,but non-zero AC coeff //------------------------------------------------------------------------------------------------- // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "nova_defines.v" module end_of_blk_decoding (reset_n,cavlc_decoder_state, TotalCoeff,i_TotalCoeff,end_of_one_residual_block,end_of_NonZeroCoeff_CAVLC ); input reset_n; input [3:0] cavlc_decoder_state; input [4:0] TotalCoeff; input [3:0] i_TotalCoeff; output end_of_one_residual_block; output end_of_NonZeroCoeff_CAVLC; reg end_of_one_residual_block; reg end_of_NonZeroCoeff_CAVLC; reg lumaDC_IsAllZero; reg ChromaDC_Cb_IsAllZero; reg ChromaDC_Cr_IsAllZero; always @ (reset_n or cavlc_decoder_state or TotalCoeff or i_TotalCoeff) if (reset_n == 0) end_of_one_residual_block <= 0; else if (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT && TotalCoeff == 0) end_of_one_residual_block <= 1; else if (cavlc_decoder_state == `LevelRunCombination && i_TotalCoeff == 0) end_of_one_residual_block <= 1; else end_of_one_residual_block <= 0; always @ (reset_n or cavlc_decoder_state or i_TotalCoeff) if (reset_n == 0) end_of_NonZeroCoeff_CAVLC <= 0; else if (cavlc_decoder_state == `LevelRunCombination && i_TotalCoeff == 0) end_of_NonZeroCoeff_CAVLC <= 1; else end_of_NonZeroCoeff_CAVLC <= 0; endmodule
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