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Issue when using ADV7619 in 1080p / 24-25-30Hz

Question asked by elaurend on Mar 24, 2014
Latest reply on Oct 15, 2014 by GuenterL

Hello,

we are currently working on a FPGA (Altera Cyclone V)
interfacing the ADV7619 Video Chip, and we are facing
an issue for which you will may be able to help us.

The chip delivers correctly HDMI 1080p @ 50Hz and 60Hz
with our registers configuration (see below), but fails to deliver
correct HDMI Signaling @ lower frame rates : 24, 25 or 30Hz :
- the received clock in the FPGA is 74,25MHz, which is correct.
- but the VSYNC / HSYNC / DE signals are not stable
(DE not a burst of 1920 pixels, HSYNC and VSYNC containing glitches, etc ...)

like if the ADV7619 was not locked to the incoming video stream.


The video registers configuration is the recommended one :
(we don't need Free Run mode)
VID_STD = 0x02
PRIM_MODE[3:0]: 0x06

If necessary I can provide more details with waveforms showing the issue.

 

The board used is a custom one, and we don't have the AD Eval Board.

Many thanks for your help
Best Regards,

Etienne

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