Servicing multiple hot-plug events utilizing a common event...

Details Servicing multiple hot-plug events utilizing a common event... Servicing multiple hot-plug events utilizing a common event...

2007-04-03

2007-04-03

Huynh, Kim (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S015000, C710S062000, C710S300000, C710S301000, C710S302000, C710S260000

Reexamination Certificate

active

10449276

ABSTRACT:
Each attention button is tied to a presence signal, which is also used to detect the presence of a PCI adapter card within a slot. By comparing HPPC register states, pending due to a system control interrupt (“SCI”), with stored HPPC register states prior to the SCI, the HPPC is able to distinguish between an attention button press and a PCI card insertion or removal and therefore may respond appropriately to the SCI. According to the method, SCIs generated in a computer system by attention buttons are diagnosed and serviced by storing the contents of the HPPC registers. The contents of the registers identify the state of the presence and manually-operated retention latch (“MRL”) signals prior to the occurrence of a SCI and upon receiving a SCI corresponding to a state change for either signal, identify the hot plug controller and the slot where the interrupt occurred.

REFERENCES:
patent: 5819053 (1998-10-01), Goodrum et al.
patent: 6101322 (2000-08-01), Goodrum et al.
patent: 6578099 (2003-06-01), Bassman et al.
patent: 2003/0065752 (2003-04-01), Kaushik et al.
PCI Hot-Plug Specification, Revision 1.1, Jun. 20, 2001.
PCI Standard Hot-Plug Controller and Subsystem Specification, Revision 1.0, Jun. 20, 2001.

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