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Transient vertical sync problem at CSI input

Question asked by Pawel Cern on Feb 2, 2015
Latest reply on Oct 26, 2015 by Qiang Li - Mpu Se
Branched to a new discussion

Hi,

 

I have pretty simple circuit, where ADV7180 (analog video decoder) is attached to i.MX6 CSI input. I am using embedded AV codes. EN is tied to permanently to active level, thanks to this AV codes are processed by CSI. The solution works fine in almost all cases. Transient problem occurs when analog signal source changes (it happens outside, i.MX has no knowledge about this). New picture starts slowly moving down and, after proper position is reached, it stops and is OK (new frames are just captured correctly). The phenomena takes up to several seconds. During that time, IPU reports framing errors (IPU_STAT_INT_5 = 0x00000001). Could you please describe briefly steps (register accesses) to "resync" the circuit when IPU error occurs? Lack of sync during 2 - 3 frames would be acceptable, as this is small fraction of second.

 

Pawel

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