Hi all,
I am having some confusion regarding the sync signal output polarity control of the ADV7511 and would appreciate your help.
For my application using the ADV7511, I need to invert the polarity of the output sync signals.
However, in the ADV7511 Programming User Guide Rev. G, page 157, Register 0x17, the descriptions for Bit[6] Vsync Polarity and Bit[5] Hsync Polarity appear inconsistent when Sync Adjustment Register (0x41[1]) = 0 (Case 2).
I found the following two different descriptions:
0 = sync polarity pass through
1 = sync polarity invert
and
0 = High polarity
1 = Low polarity
This has caused some confusion.
(1)
For Case 2 (0x41[1] = 0), do you think the following description is a typo?
0 = High polarity
1 = Low polarity
(2)
My current settings are:
0x17[6:5] = 2'b00
0x41[1] = 0
With these settings, the behavior is as follows:
Negative-polarity VSYNC input → Negative-polarity VSYNC output
Negative-polarity HSYNC input → Negative-polarity HSYNC output
If I change the settings to:
0x17[6:5] = 2'b11
0x41[1] = 0
will the behavior become:
Negative-polarity VSYNC input → Positive-polarity VSYNC output
Negative-polarity HSYNC input → Positive-polarity HSYNC output
Could you please confirm whether this understanding is correct?
Thank you in advance for your support.
Best regards,
aimPoint
