Diagnostic arrangement for digital computer system
US5908471A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Jan 31, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/221
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A diagnostic subsystem is used in a digital device in a digital computer system includes a diagnostic register, a device output control circuit and a diagnostic register reset circuit. The diagnostic register includes a plurality of stages each of which is associated with one of the types of transfers over the bus. Each stage is selectively conditionable by the digital computer system's processor. The device output control circuit controls transfers by the digital device over the bus. The device output control circuit enables the digital device, when it is to engage in a transfer, to transfer information correctly when the associated stage is set and to transfer information incorrectly when the stage has the set condition. For transfers in which the one device is to transmit information over the bus, the incorrectly transmitted information causes error checking circuitry in other devices in the system to generate error indications, which are provided to the processor. On the other hand, for transfers in which the device is to receive information over the bus, correctly received information causes error checking circuitry in the device to generate an error indication, which is also …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.