Universal routing in PCI-Express fabrics
US7752346B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2007 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Dec 30, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4022
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A universal routing identifier (URID) is provided to extend the function space in PCI-Express fabrics. Methods and systems based on the URID are provided for configuring URID capable devices and upgrading PCI-Express bridges and switches having lookup tables with access control functionality. The lookup table entry contains URIDs of destination ports, backup ports, acceptance ports, and permitted ports for downstream and upstream filtering, routing and arbitrating of transaction packets. URID capable devices can be incrementally added to current PCI-Express bridges and switches. A configuration mechanism is added to the current PCI/PCI-Express enumeration software. The URID capabilities can be disabled to maintain system compatibility. A URID capable PCI-Express system is able to address ten of thousands single-function devices. A URID capability segment field is provided in the current PCI-Express configuration space. Each URID capable device contains the URID capability segment implemented in its own set of configuration space registers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.