US4580232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single point microprocessor reset
Assignee: Xerox Corp
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Filing: 1982-09-21
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Granted: 1986-04-01
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Expires: 2002-09-21
Abstract
Abstract The present invention is the designation of one of the processors in the system as the master processor with the roll of resetting the other processors after a software crash. When a system software crash occurs, the master processor provides a reset signal that is automatically conveyed to each of the other processors to synchronize the return of the other processors back to the normal state of operation.
Inventors
- 👤 Michael T. Dugan
- 👤 George E. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/55; G06; G06F; G06F1/00; G06F1/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A multiprocessor control for controlling operation of a reproduction machine having a plurality of controlled elements including a photoreceptor, each of the controlled elements cooperating with one another to produce images on a copy sheet, the multiprocessor control comprising a plurality of remote processors, the remote processors controlling portions of the controlled elements to produce said images on the copy sheet, a master processor responding to a control malfunction, at least one reset like interconnecting the master processor with the remote processors, reset circuitry electrically connected to the remote processors and responsive to the master processor to provide reset signals to the remote processors via the reset line, means for the master processor to activate the reset circuitry and simultaneously provide reset signals to said remote processors in response to a control malfunction, and means for resynchronizing the remote processors and for maintaining machine operation in response to said reset signals to continue producing said images on the copy sheets.
Claim 2
Dependent Claim
160 words
A multiprocessor control for controlling operation of a reproduction machine having a plurality of controlled elements including a photoreceptor, each of the controlled elements cooperating with one another to produce images on a copy sheet, the multiprocessor control comprising a plurality of remote processors, the remote processors controlling portions of the controlled elements to produce said images on the copy sheet, a master processor responding to a control malfunction, at least one reset like interconnecting the master processor with the remote processors, reset circuitry electrically connected to the remote processors and responsive to the master processor to provide reset signals to the remote processors via the reset line, means for the master processor to activate the reset circuitry and simultaneously provide reset signals to said remote processors in response to a control malfunction, and means for resynchronizing the remote processors and for maintaining machine operation in response to said reset signals to continue producing said images on the copy sheets.
Claim 3
Dependent Claim
33 words
The control of claim 1 wherein the reset circuitry includes a transistor and a buffer coupled to the transistor, the transistor providing a reset signal for each of the plurality of remote processors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |