Method and apparatus for an I/O controller to alert an...

Details Method and apparatus for an I/O controller to alert an... Method and apparatus for an I/O controller to alert an...

2006-09-05

2006-09-05

Perveen, Rehana (Department: 2112)

Electrical computers and digital data processing systems: input/

Interrupt processing

C710S008000

Reexamination Certificate

active

07103692

ABSTRACT:
Embodiments of the present invention provide a method and apparatus to allow an I/O controller to alert an external controller using an enhanced SMBus implementation that enables bi-directional capability on SMBALERT#. I/O controller includes an auxiliary control register and alert output enable (AOEN) register. When host sets AOE bit in auxiliary control register, SMBALERT# signal is configured as an output signal with bi-directional functionality. External controller uses an interface command to write to AOEN register and determine events/conditions it wants to be alerted on. SMBALERT# is activated in response to a detected event/condition. In response to SMBALERT#, external controller determines the alert generation condition using byte read commands on the system management bus, and clears SMBALERT#.

REFERENCES:
patent: 5327121 (1994-07-01), Antles, II
patent: 5764714 (1998-06-01), Stansell et al.
patent: 6070253 (2000-05-01), Tavallaei et al.
patent: 6321289 (2001-11-01), Engfer et al.
patent: 6463492 (2002-10-01), Engfer et al.
System Management Bus (SMBus) Specification, Version 2.0, Aug. 3, 2000, pp. 1, 9, 55, 56.

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