DE2_TV Line_Buffer u10 u11是干嘛的

DE2_TV Line_Buffer u10 u11是干嘛的

//	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));





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};

assign	mYCbCr		=	m5YCbCr;

这个延时可以消除噪声 但是下面的计算看不懂 4个tmp