- The HOST_IRQ signal is provided to indicated when the system has completed
auto-initialization.
- While reset is applied, HOST_IRQ is tri-stated (an external pullup resistor
pulls the line high).
- HOST_IRQ remains tri-stated (pulled high externally) until the boot process
completes. While the signal is pulled high, this indicates that the controller
is performing boot-up and auto-initialization.
- As soon as possible after the controller boots up, the controller drives HOST_IRQ to a logic high state to indicate that the controller is continuing to perform auto-initialization (no real state changes occur on the external signal).
- The software sets HOST_IRQ to a logic low state at the completion of the
auto-initialization process. At the falling edge of the signal, the
initialization is complete.
- The DLPC3479 controller is ready to receive
commands through I2C or accept video
over the DSI or the parallel interface only after
auto-initialization is complete.
- The controller initialization typically completes (HOST_IRQ goes low) within 500ms of RESETZ being asserted. However, this time varies depending on the software version and the contents of the user-configurable auto initialization file.