Multiple comparison circuitry for providing a software error trace signal
US4453093A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Apr 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30029
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for performing a logical not function in a multi-compare environment is disclosed. By performing two equivalence compares of a measured variable against selectable target values and using the result of the equivalence compares to selectivity set or reset a bistable element, the need for inverting and multiplexing the output of a comparator that is otherwise required when performing a NOT equivalence function in a single-compare environment is eliminated. The not function logic is used in a system analyzer connected to a data processing system and is used to selectively enable the tracing of software execution as a function of whether or not a variable is a predefined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.