Dear,
I am designing a 4CH video input system using the DM3730 and TVP5158. Design requirements includes:
1. Input 4 Video channels to the DM3730 simultaneously
2. With D1 or half-D1 frame size
From the datasheets, above requirements can be achieved by:
Solution A: Configure the decoder in 4CH pixel/line interleaved mode + D1 size + 8bits ITU-R BT.656 at 108MHz. However, the DM3730 video interface cannot support BT.656 up to 108MHz.. Therefore this solution can not be done.
Solution B: Configure the decoder in 4CH pixel/line interleaved mode + Half-D1 size + 8bits ITU-R BT.656 at 54MHz.. As far as I know, this solutions will work with the DM3730.
However, due to our application's specific requirement, we would like to have Half-D1 as 720x240 (Horizontal scaling: 1:1; Vertical scaling : 2:1) instead of 360x480 (Horizontal scaling: 2:1; Vertical scaling : 1:1) as declared in the TVP5158's datasheet. We want the image's width to be intact as 720.
So, my question is: is there a way to "trick" the TVP5158 to use 720x240 as "Half-D1" in solution B?!
Thank you!