US5325520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Invoking hardware recovery actions via action latches
Assignee: Fujitsu IT Holdings Inc
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Filing: 1992-01-03
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Granted: 1994-06-28
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Expires: 2012-01-03
Abstract
Abstract A computer system having a number of circuits and error detection circuitry for detecting errors in the circuits and providing error signals. Error recovery is provided by detecting an error with checking logic, turning off system clocks and invoking error recovery software, executing recovery software to recover from the error and set an action latch, turning on system clocks, taking hardware recovery action in response to the action latch, resetting the action latch and continue processing. Action latches are used extensively throughout the computer system.
Inventors
- 👤 Quang H. N. Nguyen
- 👤 Arun Shah
- 👤 Allan J. Zmyslowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:58
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/0703; G06F11/0793; G06F11/0706; G06F2201/00; G06F2201/865
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A method for handling errors in a computer system comprising the steps of: detecting an error with checking logic; turning off system clocks; invoking error recovery software; executing recovery software to recover from said detected error; setting of an action latch by said recovery software; turning on system clocks; executing hardware recovery action in response to the setting of said action latch for establishing a system environment for initiation of system processing in said computing system; resetting said action latch after said system environment has been established; and initiating system processing.
Claim 2
Independent Claim
91 words
A method for handling errors in a computer system comprising the steps of: detecting an error with checking logic; turning off system clocks; invoking error recovery software; executing recovery software to recover from said detected error; setting of an action latch by said recovery software; turning on system clocks; executing hardware recovery action in response to the setting of said action latch for establishing a system environment for initiation of system processing in said computing system; resetting said action latch after said system environment has been established; and initiating system processing.
Claim 3
Dependent Claim
48 words
The method of claim 1 wherein: said step of setting said action latch sets an interrupt action latch; and said step of executing said hardware recovery causes interrupts to be generated in said computing system when said clock is turn on and before system processing can be initiated.
Claim 4
Dependent Claim
51 words
The method of claim 1 wherein: said step of setting said action latch sets a clock action latch; and said step of executing said hardware recovery causes said clocks to be reestablished and synchronized in said computing system when said clock is turn on and before system processing can be initiated.
Claim 5
Dependent Claim
65 words
The method of claim 1 wherein: said step of setting said action latch sets a retry action latch; and said step of executing said hardware recovery causes said computing system to establish a state for retrying the instruction whose processing gave rise to said detected error when said clock is turn on and before said computer system processing can be initiated to retry said instruction.
Claim 6
Dependent Claim
57 words
The method of claim 1 wherein: said step of setting said action latch sets a timer action latch; and said step of executing said hardware recovery causes said timers either to be removed, reset or emulated in said computing system when said clock is turn on and before said computer system can initiate said computer system processing.
References Cited (Backward Citations)
US5153881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |