• 每天进步一点点------DE2-70-TV例子说明


     1 module Reset_Delay(iCLK,iRST,oRST_0,oRST_1,oRST_2);
     2 input  iCLK;
     3 input  iRST;
     4 output reg oRST_0;
     5 output reg oRST_1;
     6 output reg oRST_2;
     7 
     8 reg [21:0] Cont;
     9 
    10 always@(posedge iCLK or negedge iRST)
    11 begin
    12  if(!iRST)
    13  begin
    14   Cont <= 0;
    15   oRST_0 <= 0;
    16   oRST_1 <= 0;
    17   oRST_2 <= 0;
    18  end
    19  else
    20  begin
    21   if(Cont!=22'h3FFFFF)
    22             Cont <= Cont + 1'b1;
    23   if(Cont>=22'h1FFFFF)
    24             oRST_0 <= 1;
    25   if(Cont>=22'h2FFFFF)
    26             oRST_1 <= 1;
    27   if(Cont>=22'h3FFFFF)
    28             oRST_2 <= 1;
    29  end
    30 end
    31 
    32 endmodule 

    //-------------------------------------------------------------------------------
    //  TD_Detect: 通过检测消隐的iTD_HS的个数判断数据是否稳定;iTD_VS高电平有效.
    //VSYNC(低电平有效)    ------                                        ------
    //                            ---      -----------------------------        -------------------
    //HREF 高电平有效    --------------------------------------------------------------- 
    //-------------------------------------------------------------------------------

     1 module TD_Detect
     2 ( 
     3    oTD_Stable,
     4    iTD_VS,//
     5    iTD_HS,
     6    iRST_N 
     7 );
     8 input    iTD_VS;
     9 input    iTD_HS;
    10 input    iRST_N;
    11 output   oTD_Stable;
    12 reg    TD_Stable;
    13 reg    Pre_VS;
    14 reg [7:0]  Stable_Cont;
    15 //
    16 assign TD_Stable = iRST_N;
    17 assign oTD_Stable = TD_Stable;
    18 always@(posedge iTD_HS or negedge iRST_N)begin
    19  if(!iRST_N)
    20  begin
    21   TD_Stable <= 1'b0;
    22   Stable_Cont <= 4'h0;
    23   Pre_VS  <= 1'b0;
    24  end
    25  else
    26  begin
    27   //
    28   Pre_VS <= iTD_VS;
    29   //
    30   if(!iTD_VS)//表示进入消隐区域
    31    Stable_Cont <= Stable_Cont+1'b1;
    32   else
    33    Stable_Cont <= 0;
    34   // 
    35   if({Pre_VS,iTD_VS}==2'b01)//表示从消隐去进入数据有效区
    36   begin
    37    if ((Stable_Cont==24) || (Stable_Cont==25))//24、25(PAL制式)分别是顶场和低场消隐的行数 通过判断消隐去的行数
    38     TD_Stable <= 1'b1;          //判断数来据时PAL or NTSC制式 //GMK (Stable_Cont==9)NTSC制
    39    else
    40    TD_Stable <= 1'b0;//数据不稳定产生复位
    41   end
    42  end
    43 end
    44 endmodule

    //-------------------------------------------------------------------------------
    //  Reset_Delay: TD_Detect 模块的TD_STABLE(低电平复位)信号做为复位信号,检测不到正常的格式则复位。
    //            oDLY0(低电平复位)最先恢复正常,sdram、linebuffer等
    //            oDLY1(低电平复位)第二恢复正常,ITU_656 Decoder等
    //            oDLY2(低电平复位)最后恢复正常, 其他模块等
    //-------------------------------------------------------------------------------

      1 module ITU_656_Decoder
      2 ( 
      3  // Control Signals
      4  input       iRST_N,
      5  input       iTD_CLK27,
      6  input       iSwap_CbCr,
      7  input       iSkip, 
      8  // TV Decoder Input
      9  input   [7:0]   iTD_DAT,
     10  // Position Output
     11  output     [9:0]   oTV_X,
     12  output     [9:0]   oTV_Y,
     13  output   [31:0]  oTV_Cont,
     14  // YUV 4:2:2 Output
     15  output     [15:0]  oYCbCr,
     16  output        oDVAL
     17 );
     18 assign oTV_X  = Count>>1;
     19 assign oTV_Y  = TV_Y;
     20 assign oYCbCr = YCbCr;
     21 assign oDVAL  = Data_Valid;
     22 assign oTV_Cont = Data_Cont;
     23 
     24 //
     25 reg   [23:0]  Window;
     26 wire  [23:0]  Window_N;
     27 always@(posedge iTD_CLK27 or negedge iRST_N)begin
     28  if(!iRST_N)
     29   Window <= 24'h0;
     30  else
     31   Window <= Window_N;
     32 end
     33 assign Window_N = {Window[15:0],iTD_DAT};  
     34  
     35 //
     36 wire SAV;
     37 assign SAV = ((Window == 24'hff0000) && (iTD_DAT[4] == 1'h0));
     38 
     39 reg  [17:0]  Count,Count_N;
     40 always@(posedge iTD_CLK27 or negedge iRST_N)begin
     41  if(!iRST_N)
     42   Count <= 18'h0;
     43  else
     44   Count <= Count_N;
     45 end   
     46 always@(*)begin
     47  if(SAV)
     48   Count_N = 18'h0;
     49  else if(Count == 1440)
     50   Count_N = Count;
     51  else
     52   Count_N = Count + 1'h1;
     53 end
     54 
     55 reg  Active_Video,Active_Video_N;
     56 always@(posedge iTD_CLK27 or negedge iRST_N)begin
     57  if(!iRST_N)
     58   Active_Video <= 1'h0;
     59  else
     60   Active_Video <= Active_Video_N;
     61 end 
     62 always@(*)begin
     63  if(SAV)
     64   Active_Video_N = 1'h1;
     65  else if(Count == 1440)
     66   Active_Video_N = 1'h0;
     67  else
     68   Active_Video_N = Active_Video;
     69 end 
     70 
     71 reg  Field,Field_N;
     72 always@(posedge iTD_CLK27 or negedge iRST_N)begin
     73  if(!iRST_N)
     74   Field <= 1'h0;
     75  else
     76   Field <= Field_N;
     77 end 
     78 always@(*)begin
     79  if(Window == 24'hff0000)
     80   Field_N = iTD_DAT[6];
     81  else
     82   Field_N = Field;
     83 end
     84 
     85 reg  Pre_Field;
     86 always@(posedge iTD_CLK27 or negedge iRST_N)begin
     87  if(!iRST_N)
     88   Pre_Field <= 1'h0;
     89  else
     90   Pre_Field <= Field;
     91 end 
     92 
     93 reg  FVAL,FVAL_N;
     94 always@(posedge iTD_CLK27 or negedge iRST_N)begin
     95  if(!iRST_N)
     96   FVAL <= 1'h0;
     97  else 
     98   FVAL <= FVAL_N;
     99 end 
    100 always@(*)begin
    101  if(Window == 24'hff0000)
    102   FVAL_N = !iTD_DAT[5];
    103  else
    104   FVAL_N = FVAL;
    105 end 
    106 
    107 reg  Start,Start_N;
    108 always@(posedge iTD_CLK27 or negedge iRST_N)begin
    109  if(!iRST_N)
    110   Start <= 1'h0;
    111  else
    112   Start <= Start_N;
    113 end 
    114 always@(*)begin
    115  if({Pre_Field,Field} == 2'b10)
    116   Start_N = 1'h1;
    117  else
    118   Start_N = Start;
    119 end 
    120 
    121 reg  Data_Valid,Data_Valid_N;
    122 always@(posedge iTD_CLK27 or negedge iRST_N)begin
    123  if(!iRST_N)
    124   Data_Valid <= 1'h0;
    125  else
    126   Data_Valid <= Data_Valid_N;
    127 end
    128 always@(*)begin
    129  if(Start && Active_Video && FVAL && Count[0] && !iSkip)
    130   Data_Valid_N = 1'h1;
    131  else
    132   Data_Valid_N = 1'h0;
    133 end 
    134 
    135 reg [9:0]  TV_Y,TV_Y_N;
    136 always@(posedge iTD_CLK27 or negedge iRST_N)begin
    137  if(!iRST_N)
    138   TV_Y <= 10'h0;
    139  else
    140   TV_Y <= TV_Y_N;
    141 end
    142 always@(*)begin
    143  if(!FVAL)
    144   TV_Y_N = 10'h0;
    145  else if(FVAL && SAV)
    146   TV_Y_N = TV_Y + 1'h1;
    147  else
    148   TV_Y_N = TV_Y;
    149 end
    150 
    151 reg  [31:0]  Data_Cont,Data_Cont_N;
    152 always@(posedge iTD_CLK27 or negedge iRST_N)begin
    153  if(!iRST_N)
    154   Data_Cont <= 32'h0;
    155  else
    156   Data_Cont <= Data_Cont_N;
    157 end 
    158 always@(*)begin
    159  if(!FVAL)
    160   Data_Cont_N = 32'h0;
    161  else if(Data_Valid)
    162   Data_Cont_N = Data_Cont + 1'h1;
    163  else
    164   Data_Cont_N = Data_Cont;
    165 end
    166 
    167 reg  [7:0]  Cb,Cb_N;
    168 reg  [7:0]  Cr,Cr_N;
    169 reg  [15:0] YCbCr,YCbCr_N;
    170 
    171 always@(posedge iTD_CLK27 or negedge iRST_N)begin
    172  if(!iRST_N)
    173   begin
    174   Cb  <= 0;
    175   Cr  <= 0;
    176   YCbCr <= 0;
    177   end
    178  else begin
    179   if(iSwap_CbCr)//商=1440/9
    180    case(Count[1:0])
    181    0 : Cb  = iTD_DAT;
    182    1 : YCbCr = {iTD_DAT,Cr};
    183    2 : Cr  = iTD_DAT;
    184    3 : YCbCr = {iTD_DAT,Cb};
    185    endcase
    186   else
    187    case(Count[1:0])
    188    0 : Cb  = iTD_DAT;
    189    1 : YCbCr = {iTD_DAT,Cb};
    190    2 : Cr  = iTD_DAT;
    191    3 : YCbCr = {iTD_DAT,Cr};
    192   endcase
    193  end
    194 end
    195  
    196 endmodule 
    197 
    198  

    //------------------------------------------------------------------------------
    //  ITU_656_Decoder :本模块实现去除消隐区,并将一行720个像素减为640个
    //                               oRESET_1(低电平复位)第二恢复正常,ITU_656 Decoder等
    //                              “XY”为控制字。“XY”的8个bit含义如下:
    //                               • Bit7(Const),常数,总为1。
    //                               • Bit6(F),场同步信号,表示该行数据处于奇场还是偶场。
    //                               • Bit5(V),垂直同步信号,表示处于场消隐区间还是正程区间(有效数据行)。
    //                               • Bit4(H),水平同步信号,表示是“SAV”还是“EAV”。
    //                               • Bit3-0(P3P2P1P0,纠错位。P3=V(XOR)H;P2=F(XOR)H;P1=F(XOR)V;P0=F(XOR)V(XOR)H。
    //                              其中, F:标记场信息,传输顶场时为0,传输底场时为1
    //                                       V:标记消隐信息,传输消隐数据时为1,传输有效视频数据时为0
    //                                       H:标记EAV还是SAV,SAV为0,EAV为1
    //-------------------------------------------------------------------------------

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  • 原文地址:https://www.cnblogs.com/kongqiweiliang/p/3245402.html
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