Our customer is using ADV7612 as their HDMI Rx, and select Amlogic S805 ARM Cortex A5 CPU as the platform's multimedia chip, output HDMI signal to ADV7612 port A.
They can display 480P / 576P as well, but S805 output 720P@50/60 or above, the picture in 720P is virtical bounce. We check the waveform from scope, found the Vsync pulse width output from ADV7612 was unstable, the time gap of the min pulse width to max pulse width have 53.6us, please see attached file(720P_VSYNC.bmp).
I found ADV7612 EVB (EVAL-ADV7612-7511, FW version: ) have the same symptom, the EVB FW infomation as below:
U-Boot 2010.06 (ADI-2010R1-RC2) (Jan 12 2011 - 15:53:34)
CPU: ADSP bf524-0.2 (Detected Rev: 0.2) (spi flash boot)
Advantiv Video Evaluation Board Software Version: 1.55
EVAL-ADV7612-7511 Application Built on Jun 11 2012 at 11:27:36
Can you give me any suggestion for this issue?
Thank you very much!!