Real time comparison of integrated circuit operation
US5948111A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1994 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Jul 6, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1695
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pair of substantially identical integrated circuit elements, in the form of microprocessors, are operated in response to the same instruction and data signals that are accessed from a memory by one of the integrated circuits. The accessed instruction and data signal are supplied, via a synchronous interface, to the second integrated circuit, which operates thinking that the supplied data and instruction signals were accessed by it in response to address and control signals. The states of the two integrated circuits are applied to comparator circuitry, both via buffered paths. The comparator circuitry is operated in response to control signals produced by the first integrated circuit to effect comparison on only those signals that are valid at any particular moment in time. Clock-synchronizing circuitry is included to ensure that predetermined state transitions of the clocks used to operate the first and second integrated circuit occur within a prescribed time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.