Method, apparatus, and system for generating serial...

Details Method, apparatus, and system for generating serial... Method, apparatus, and system for generating serial...

2005-05-24

2005-05-24

Ray, Gopal C. (Department: 2111)

Electrical computers and digital data processing systems: input/

Interrupt processing

Programmable interrupt processing

C713S300000, C713S320000, C710S260000

Reexamination Certificate

active

06898651

ABSTRACT:
According to one embodiment of the invention, a first signal line is provided for a serial interface unit (SIU) of an I/O controller to report interrupt requests to an interrupt controller. In one embodiment, a transition of the first signal line from a first level (e.g., low level or logic 0) to a second level (e.g., high level or logic 1) indicates a pending interrupt to the interrupt controller. A pull up resistor is provided to pull the first signal line to the second level when the first signal line is not driven by the SIU. In response to detecting an interrupt request initiated by an I/O device, a transition from the first level to the second level is generated on the first signal line for a predetermined duration to report the pending interrupt request to the interrupt controller.

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