AnsweredAssumed Answered

ADV7513 Image not stable

Question asked by peter_chang on Aug 29, 2013
Latest reply on Oct 31, 2013 by peter_chang



I'm using a FPGA borad that uses an ADV7513 as a transmitter to

transfer an image to HDMI.  Currently, I'm testing an input format

CEA-861 format 20 image.  The setting I did is as the followings.


0x15 = 0x01

0x16 = 0x9b

0x17 = 0x99 (Default)

0x48 = 0x00

0xaf = 0x02

0x9d = 0x61 (Default)

0xa4 = 0x08 (Default)


The input clock is 74.25Mhz. Data is 20-bit YCbCr 4:2:2 Style 1 evenly distributed.

After 0x15, 0x16, and 0x48, I can see the 0x9e = 0x10, 0x3d=0x14, 0x3e = 0x50,

all seem correct.  But I still can't see the image on TV.  Then, I have to try the 0xaf.

0xaf may change automatically.  I think it is because of the function of HPD.  After

setting of 0xaf in a value of 0x02, 0x06, or 0x16...for example, the image will be

shown on TV.  I'm not so sure why I need to set 0xaf several times?  This is the

first question.  And the further problem is that the image isn't stable.  It will

disappear in one minute after the next HDMI RX HOT PLUG .....ON shown on the

TERMINAL, which is command tool I am using.  I don't know why the image isn't

stable?  Thank you.