bt656 input with external sync?

yes it can; this is detailed in the VPFE User Guide http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=spruf71a

where can I get example of how to switch from BT.656 to REC601? how to configure the register CCDCFG, MODESET? where can i get those register definition?

thanks

Wayne

I should have been more explicit in my answer above and pardon for the long e-mail below but hopefully this will avoid confusion to others reading this post. 

REC601 (aka, BT.601, CCIR 601...) is a standard for encoding analog interlaced video into digital form.  This is normally the function of a video encoder such as TVP5146 on our EVM. 

BT.656 on the other had is a digital video standard (no analog portion here) which builds on the encoding algorithm described in REC601 and defines a protocol for transferring this video data along with embedded sync information via data pins (saves on pin-count and board space).  In other words, these standards can work hand in hand and are not a replacement of one another.

Therefore, if I would have been a bit more careful in my first response, I should have said DM355 does not support REC601 becuse it does not have an analog video input interface (it does have a analog DAC for video output).  The video input into DM355 needs to be in digital form already such as BT.656 (which by nature of the standard implies embedded syncs); alternatively, you could have YCbCr 720x480 (NTSC) input with external embedded syncs, which is what I thought you were really after in my first response (hence my quick "YES" response); however, technically this is not called BT.656 anymore, much less REC601, it is simply digital YCbCr data with external syncs which allow you to define the frame size your wish (NTSC, PAL, or other resolutions...)

Sorry for the confusion and I hope this helps clear things up.