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Date Posted: 20:55:33 03/08/02 Fri
Author: Tom
Subject: Re: Rev7t1a
In reply to: Jain 's message, "Re: Rev7t1a" on 11:23:38 03/07/02 Thu

If your picture is shifted to the left then the scrambled sync from your system is delayed or the 3chip is locking to the wrong edge. In a scrambled signal, there is a PED at the start of the HBI (where the signal becomes raised), a NED at the start of the sync, a PED at the end of the sync, and a NED at the end of the HBI. Rev7t1a locks to the NED at the start of the sync. Some PAL versions lock to the PED at the end of the sync. It is possible that the 3chip is locking to the NED at the end of the HBI instead of the NED at the start of the sync. If the lock check in MakeVBI has been disabled or modified, then it can lock on any repeating NED.

The clamp signal from the PIC was used in old 3chips to provide voltage to the clamp diodes during the video, both inverted and normal. The normal signal from the PIC is not on during inverted video.

The 3chip has never detected normal video because nobody thought it was important enough to incorporate into the design and write code for it. It should be fairly simple and I believe jpb did it but nobody expressed any interest at the time.

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