Forced diagnostic entry upon power-up

Details Forced diagnostic entry upon power-up Forced diagnostic entry upon power-up

2005-03-22

2008-09-16

Iqbal, Nadeem (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

Reexamination Certificate

active

07426659

ABSTRACT:
A data processing system2is described having a central processing unit4and a diagnostic mechanism10.The central processing unit4is switchable into a power-down mode from which it may resume into a normal operation mode. When the central processing unit4resumes into the normal operation mode, execution of program instructions is inhibited by the diagnostic mechanism10to allow the diagnostic mechanism to be appropriately programmed such that the immediate power-up code and operations can be properly diagnosed. The requirement to prevent program instruction execution on power-up is programmed by writing to a latch16within the diagnostic mechanism10prior to the power-down. The prevention of program execution may be achieved, for example, by generation of a halt request or by extending the time period for which the central processing unit4is held in reset following power-up.

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patent: 7251751 (2007-07-01), Blasco Allue et al.
patent: 2005/0210328 (2005-09-01), Allue et al.

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