module TV_to_VGA (
OSC_27,
RESET,
VGA_BLANK,
VGA_SYNC,
VGA_CLOCK,
VGA_HS,
VGA_VS,
VGA_R,
VGA_G,
VGA_B,
TD_D,
TD_HS,
TD_VS
);
input OSC_27;
input RESET;
output VGA_BLANK;
output VGA_SYNC;
output VGA_CLOCK;
output VGA_HS;
output VGA_VS;
output [9:0]VGA_R;
output [9:0]VGA_G;
output [9:0]VGA_B;
input [7:0]TD_D;
input TD_HS;
input TD_VS;
wire [7:0] Y; //4:4:4 Y
wire [7:0] Cb; //4:4:4 Cb
wire [7:0] Cr; //4:4:4 Cr
wire mTD_HSx2;
itu_r656_decoder U1
(
.CLOCK(OSC_27), //system clock
.TD_D(TD_D[7:0]), //4:2:2 video data stream
.TD_HS(TD_HS), //Decoder_hs
.TD_VS(TD_VS), //Decoder_vs
.Y(Y[7:0]), //4:4:4 Y
.Cb(Cb[7:0]), //4:4:4 Cb
.Cr(Cr[7:0]), //4:4:4 Cr
.HSx2(mTD_HSx2),
.blank(VGA_BLANK)
);
YCbCr2RGB U2(
.Red(VGA_R[9:0]),
.Green(VGA_G[9:0]),
.Blue(VGA_B[9:0]),
.iY(Y[7:0]),
.iCb(Cb[7:0]),
.iCr(Cr[7:0]),
.iRESET(!RESET),
.iCLK(OSC_27)
);
`include "VGA_Param.h"
reg [10:0]L_COUNTER;//<<
reg [10:0]RL_COUNTER;//<<
wire sync_reset=(RL_COUNTER==9)?1:0;//<<
reg sync_en;//<<
reg [7:0]delay;//<<
reg [9:0] H_Cont;
reg [9:0] V_Cont;
reg oVGA_H_SYNC;
reg oVGA_V_SYNC;
reg  re_HS;
reg re_VS;
reg mACT_HS;
reg mACT_VS;
always@(posedge OSC_27 or negedge sync_en)//<<
begin
if(!sync_en)//<<
begin
re_HS <= 0;
mACT_HS <= 0;
H_Cont <= 0;
oVGA_H_SYNC <= 0;
end
else
begin
re_HS <= mTD_HSx2;
if({Pre_HS,mTD_HSx2}==2'b10)
mACT_HS <= 1;
if(mACT_HS)
begin
// H_Sync Counter
if( H_Cont < 852 )
H_Cont <= H_Cont+1;
else
begin
H_Cont <= 0;
mACT_HS <= 0;
end
// H_Sync Generator
if( H_Cont < H_SYNC_CYC )
oVGA_H_SYNC <= 0;
else
oVGA_H_SYNC <= 1;
end
else
begin
oVGA_H_SYNC <= 0;
H_Cont <= 0;
end
end
end
always@(posedge OSC_27 or negedge sync_en)//<<
begin
if(!sync_en)//<<
begin
re_VS <= 1;
mACT_VS <= 0;
V_Cont <= 0;
oVGA_V_SYNC <= 0;
end
else
begin
re_VS <= TD_VS;
if({Pre_VS,TD_VS}==2'b01)
mACT_VS <= 1;
if( (H_Cont==1) && mACT_VS)
begin
// V_Sync Counter
if( V_Cont < 524 )
V_Cont <= V_Cont+1;
else
V_Cont <= 0;
// V_Sync Generator
if( V_Cont < V_SYNC_CYC )
oVGA_V_SYNC <= 0;
else
oVGA_V_SYNC <= 1;
end
end
end
assign VGA_HS = oVGA_H_SYNC;
assign VGA_VS = oVGA_V_SYNC;
assign VGA_SYNC = 1'b0;
assign VGA_CLOCK = OSC_27;
//>>lock detector
always @(posedge TD_HS) begin
if (TD_VS) L_COUNTER=0;
else L_COUNTER=L_COUNTER+1;
end
always @(posedge TD_VS) begin
RL_COUNTER=L_COUNTER;//1714
end
always@(negedge sync_reset or posedge TD_VS) begin
if (!sync_reset)
delay=0;
else if (delay < 250)
delay=delay+1;
end
always@(negedge sync_reset or negedge TD_VS) begin
if (!sync_reset)
sync_en=0;
else if (delay < 100)
sync_en=0;
else
sync_en=1;
end
endmodule
这个程序是DE2_TV范例里的TV_to_VGA.v程序，原工程可以从DVD播放器里的视频从VGA上显示出来。制式应该是NTSC的，我现在把制式改为了PAL制式（制式由I2C控制），可以从摄像头采集视频并显示在VGA上，但场信号出现了一些问题，显示器垂直方向闪得很厉害。我不知道该如何去修改这个TV_to_VGA.v程序，请大家指教，谢谢！！！
[此贴子已经被作者于2006-7-14 9:21:13编辑过] | 
