Hi! I am beginer and i want to use demo DE2_TV in cd rom from Kit de2 of Terasic.
Who can explain for me about codes in DE2_TV.v :
assign m1VGA_Read = VGA_Y[0] ? 1'b0 : VGA_Read ;
assign m2VGA_Read = VGA_Y[0] ? VGA_Read : 1'b0 ;
assign mYCbCr_d = !VGA_Y[0] ? m1YCbCr :
m2YCbCr ;
assign mYCbCr = m5YCbCr;
wire mDVAL;
// Line buffer, delay one line
Line_Buffer u10 ( .clken(VGA_Read),
.clock(OSC_27),
.shiftin(mYCbCr_d),
.shiftout(m3YCbCr));
Line_Buffer u11 ( .clken(VGA_Read),
.clock(OSC_27),
.shiftin(m3YCbCr),
.shiftout(m4YCbCr));
wire [15:0] m4YCbCr;
wire [15:0] m5YCbCr;
wire [8:0] Tmp1,Tmp2;
wire [7:0] Tmp3,Tmp4;
assign Tmp1 = m4YCbCr[7:0]+mYCbCr_d[7:0];
assign Tmp2 = m4YCbCr[15:8]+mYCbCr_d[15:8];
assign Tmp3 = Tmp1[8:2]+m3YCbCr[7:1];
assign Tmp4 = Tmp2[8:2]+m3YCbCr[15:9];
assign m5YCbCr = {Tmp4,Tmp3};
I don't understand function of 2 line buffer and why need use Temp1,2,3,4 with add ? The first i guess it use for deinterlace ,but then i think it is not correct ?
Thank for your help !
