Hello Gareth!
I'm using the Test Pattern Generator (from Altera) to feed the clocked video output. I configured it to generate a 720x486 pixels interlaced colorbar (F0 synchronized). The colorspace is YCbCr with 10 bits per color space using 4:2:2 sampling.
The clocked video output is configured like this:
Image Width: 720 pixels
Image Height: 486 lines
Bits per pixel per color plane: 10
Number of color planes: 2
Color plane transmission format: parallel
Interlaced video checked
Pixel fifo size: 720 pixels
Sync signals: on separate wires
The synchronization signals settings are what I need to know
Using embedded sync signals the video was output perfectly, but I really need the external sync signals to drive other components
Thiago