connection between VIP suite and SGDMA (inconsistent data width)

[Altera_Forum]

Hi all 

 My project is to transfer video data to PCIE.  As my first step, I try to use Test Pattern Generator (TPG) as a temporary video data input and connect the output data from TPG to SGDMA via the Avalon Streaming Interface. The SGDMA works in the transfer mode of "stream-to-memory" and its output is connected to a SDRAM controller IP.  My problem is the inconsistent data width between TPG output and SGDMA input. The parameter settings in TPG are 720-by-480, 10-bits, and YCbCr 4:2:2. (I'm going to use SDI receiver as the interface of real video data input so the data width must be 10-bits) QSys shows an error message "Error: System.tpg.dout/sgdma_0.in: The source has 10 bits per symbol, while the sink has 8."  Does anyone know how to solve this problem? Thanks.

[Altera_Forum]

How did You solve this problem?

[Altera_Forum]

Make your source video from the TPG be 8 bits. 

When you output to your SDI receiver, connect the 8 bit video from the TPG to the 8 MSBs of the 10 bit SDI interface. The low 2 LSBs you can just set to zero.  like so:  SDI_video(9 downto 2) <= TPG_vid_out; SDI_video(1 downto 0) <= "00";