Video A H264 ROI region4 range configure register.
| X | Configures the horizontal start macroblocks of region 4 in Video A. |
| Y | Configures the vertical start macroblocks of region 4 in Video A. |
| X_LEN | Configures the number of macroblocks in horizontal direction of the region 4 in video A. |
| Y_LEN | Configures the number of macroblocks in vertical direction of the region 4 in video A. |
| EN | Configures whether or not to open Video A ROI of region 4 .\0:Close ROI\1:Open ROI. |