System and method for point-to-point serial communication between a system interface device and a bus interface device in a computer system
US6363439B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1998 |
| Grant date | Mar 26, 2002 |
| Priority date | — |
| Expiry date | Dec 7, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A point-to-point serial communication link between a system interface unit and a peripheral bus interface unit is provide. The system bus interface unit may interface between a CPU bus and a peripheral bus, such as the PCI bus, and may be referred to as a north bridge. The system interface unit may also interface to main memory and to an advanced graphics port. The peripheral bus interface unit may interface between a first peripheral bus, such as the PCI bus, and a second peripheral bus, such as an ISA bus, and may be referred to as a south bridge. The serial communication link between the system interface unit and the bus interface unit may be a one wire serial bus that uses a bus clock from the first peripheral bus as a timing reference. This clock may be the PCI clock. The serial communication link may use a single pin on the system interface unit and a single pin on the bus interface unit to transfer commands between the interface units. A pull-up device may be provided on the serial communication link to maintain a high voltage level on the link when it is not being driven by one of the bus interface units. The north bridge and south bridge may alternate between sending and r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.