What conditions cause CHx_STDI_DVALID to be low? (for all kinds of inputs)
STDI_DVALID indicates the lock status of the STDI. STDI lock occurs when 4 consecutive VSync lengths occur AND 128 consecutive HSync lengths occurs. STDI unlocks when 4 consecutive VSync lengths exceed the threshold OR 128 consecutive HSync lengths exceed the threshold.
Check out paragraph 10.8.3 in the hardware users guide.
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