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Grayscale output using ADV7391

Hi,

I am using ADV7391 with my Intel FPGA for displaying video on monitor. I am able to generate color patterns from FPGA logic (SD Input, 8- Bit ITU-R BT.601/656 ,Input Mode 000).

Now I want to display some grayscale images on to this display. I have changed my pixel values as shown below to give grayscale output.

Cb <= X"80"; Cr<=X"80";Y_dout<=X"10";
Cb <= X"80"; Cr<=X"80";Y_dout<=X"10";
Cb <= X"80"; Cr<=X"80";Y_dout<=X"7F";
Cb <= X"80"; Cr<=X"80";Y_dout<=X"7F";
Cb <= X"80"; Cr<=X"80";Y_dout<=X"C0";
Cb <= X"80"; Cr<=X"80";Y_dout<=X"C0";

Register settings are given below. 

0x00, 0x10
0x01, 0x00
0x80, 0x10
0x82, 0xCB
0x87, 0x20
0x88, 0x00

But I couldn't see anything on display. Please let me know how I can display grayscale images.

Thanks in advance.

Regards,

Reshma



edited subject
[edited by: ReshmaR at 11:51 AM (GMT -4) on 20 Jul 2021]