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
//-------------------------------------------------------------------------------