AnsweredAssumed Answered

ADV7511 register value flickers

Question asked by ByungJunKim on Jan 2, 2017
Latest reply on Jan 6, 2017 by GuenterL

Hi, I'm beginner for designing system with FPGA.


What I'm doing is get image data from PC(DVI) to ADV7611(RX, HDMI) and transmit YCbCr datas to ADV7511(TX).


Then, I would tranmit HDMI data to my monitor, which I want to display the image from PC.


I think I successfully get the HDMI data from PC to ADV7611.


But my monitor doesn't display any image.


I checked a few of registers of ADV7511 by I2C reading.


Then I found somethings that is strange.


Firstly, When I checked 0x15, 0x16 of ADV7511, the value of register was what I expected.


But, when I checked the registers regarding with HPD (0x41, 0x42, 0x96) , they have the value that I expected. But,


Their value changed continuously (value --> 8'h0x00 --> value --> 8'h0x00 ......) periodically.


For example


Value of 0x42 changes 8'h0xF0 --> 0 --> 8'h0xF0 --> 0 .....


Value of 0x96 changes 8'h0xC0 --> 0 --> 8'h0xC0 --> 0......


I think this problem is related with why my monitor doesn't display any image.


What should I check more? 


Could you give me some advice?