Improved terminator for high speed data bus
US4595923A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Apr 24, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A very high speed data bus system for communication among the various functional units that may constitute a large computer system. The bus communication medium comprises a number of line pairs on the backplane, and the bus system comprises a bus control unit for arbitrating requests from a plurality of interface units or ports, there being one such port associated with each functional unit. The functional units are densely packed, that is, mounted in immediately adjacent connectors to define a populated section of the backplane in which all connectors have ports coupled thereto, and one or two unpopulated sections of the backplane in which the connectors are empty. In the populated section, the effective characteristic impedance, designated Z.sub.0 ', is lower than the effective characteristic impedance, designated Z.sub.0, in the unpopulated region. A populated end of the transmission line is resistively terminated with a resistance corresponding to Z.sub.0 ' while the unpopulated end is terminated with a resistance corresponding to Z.sub.0. The border between the populated and unpopulated sections is terminated with a resistance corresponding to 1/(1/Z.sub.0 '-1/Z.sub.0), design…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.