SPRUJB3 March 2024 AM67 , AM67A , TDA4AEN-Q1 , TDA4VEN-Q1
The overlay input selector before the overlay manager is a n-input to n-output crossbar switch. As such, any input can be connected to any output in the selector. The selection is based on the z-order layer selection in the overlay configuration through the following register fields:
The z-order determines the order in which the selected layers are blended together to generate the final output by the overlay manager:
The OVR input selector also passes the following attributes from the selected input pipeline to the corresponding selector output port:
Then, the overlay manager uses the above listed attributes as input layer attributes along with POSX and POSY overlay manager configuration parameters. POSX and POSY can be configured as follows:
The output of an input pipeline can be mapped to more than one overlay manager simultaneously, if and only if the following conditions are true:
The software is responsible for managing the pipeline assignment and setting up the video port timing generators properly in order to avoid any resource conflicts that may cause the DSS to lock up (sync loss).