I'm Japanese. I'm sorry for my poor English.
I'm evaluating ADV7800.
When ADV7800 is input 1920x1080(138MHz) of Analog RGB, my ADV7800 can't detect input signal.
I can convert 1280x800,1366x768, 1920x1080(148.5MHz).
I check CP-0xB1 and 0xB2 to detect change of resolution.
But when ADV7800 is input 1920x1080(138MHz) of Analog RGB, those registers are strange.
CP-0xB1 - 0x3F
CP-0xB2 - 0xFF
↑This Value is same stat, no signal.
Hsync's pulse width is 240 ns. ※1920x1080 (138MHz)
But I adjust Hsync's pulse width to 250 ns, ADV7800 can detect 1920x1080(138MHz) of Analog RGB.
Can't ADV7800 detect Hsync that is within the 250ns?
What do you think of this?
※I use following signal.
Pixel Clock : 138.5 MHz
Horizontal Active : 1920 pixels
Horizontal Front porch : 48 pixels
Horizontal Sync width : 32 pixels
Horizontal Back porch : 80 pixels
Horizontal Scan rate : 66.587kHz
Vertical Active : 1080 line
Vertical Front porch : 3 line
Vertical Sync width : 5 line
Vertical Back porch : 23 line
Vertical scan rate : 59.934 Hz