Bus bridge circuit having configuration space enable register for controlling transition between various modes by writing the bridge identifier into CSE register
US5574869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1996 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Feb 20, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4027
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A configuration space enable/disable mechanism for transferring configuration data to and from peripheral components coupled to one or more peripheral component buses. Bridge circuits implement four configuration modes: a NORMAL mode, a BLOCK mode, a CONFIG mode, and a PASS mode. The configuration mode of each bridge circuit is controlled by writing to a configuration space enable (CSE) register. The BLOCK mode blocks predetermined types of accesses in order to allow configuration access through a peer bridge circuit. The CONFIG mode maps preselected types of accesses into configuration space accesses. The PASS mode passes the preselected types of accesses to the secondary bus to allow configuration space access through a bridge circuit in one of the lower levels of the hierarchy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.