Display HPD Circuit With Early High-Level Signal for BIOS Startup

The delay control module is configured to set the HPD signal to high level in advance before the main control module completes its initialization. Specifically, when the second control signal is low, the delay control module activates the HPD signal early, allowing the BIOS screen to be displayed. After the main control module finishes initialization and outputs the first control signal, the delay control module turns off the HPD signal. This preliminary action resolves the contradiction by ensuring the HPD signal is active early enough for BIOS display while maintaining proper initialization sequencing.

The patent introduces a delay control module as an intermediary component between the control signals and the HPD signal output. This module includes a delay control unit with switching elements (first switching element and second switching element) that are controlled by first and second control signals respectively. The intermediary module simplifies the overall system by providing a dedicated hardware mechanism for timing control, eliminating the need for complex software optimization and repeated verification while achieving precise control over when the HPD signal is activated.

Instead of modifying the hardware delay characteristics of the power system (which would be costly), the patent changes the operational parameters by introducing a delay control module that can dynamically control the HPD signal timing. The module uses control signals to switch between different operational states, effectively adjusting the timing parameter without requiring hardware modifications to the power system itself. This approach achieves faster HPD signal activation at low cost by changing control parameters rather than hardware characteristics.