General IP configuration parameters are not covered in this specification. However, commonly used video IP parameters generally are listed in Table: Standard Video IP Parameters .
Only one video format can be supported in video IP core systems that use an AXI-4 interface without an embedded processor. For this configuration ( C_HAS_AXI4_LITE =0), you can define the supported resolution through generic parameters C_ACTIVE_ROWS and C_ACTIVE_COLS defined in the core GUI. When C_HAS_AXI4_LITE =0, C_ MAX_COLS should be equal to C_ACTIVE_COLS .
When an embedded processor is present and the Video core is instantiated with an AXI4-Lite interface ( C_HAS_AXI4_LITE =1), generic parameters C_ACTIVE_ROWS and C_ACTIVE_COLS assign default values to control registers to define the active resolution. As an upper bound on the active scanline length supported by the core instance, C_MAX_COLS is used to define line buffer depths, which have a direct effect on block RAM footprint. For example, a video core, instantiated to service 720p video (1650 total pixels, 1280 active pixels per line), needs to have C_MAX_COLS set to 1280. This core instance is not be able to service 1080p video, but works with 720p or any lower resolutions, such as 480p, when the active_size register in the AXI4-Lite control interface is set according to 720p or 480p.
C_MAX_COLS refers to the maximum number of non-blank pixels a core instance must service. This parameter is often used to allocate block RAMs for line buffers within the core. For example, a core instance targeting resolutions up to 720p must have this parameter set to 1280.