In encode mode, how do I know if the ADV202/212 is ready to output data?

Depending on what mode is used to output data the ADV202/212 will indicate when it is ready to output data:

In Normal Host Mode: CODE FIFO threshold flag is set. Refer to the ADV202/212 Programming Guide for configuration example.

In JDATA Mode: VALID is asserted. Refer to the ADV202/212 Programming Guide for a configuration example and the System Register section in the User's Guide.

In any DMA mode: DREQ/ is asserted. Refer to the ADV202/212 Programming Guide for a configuration example and the System Register section in the User's Guide.