Data bus with separate matched line impedances and method of...

Details Data bus with separate matched line impedances and method of... Data bus with separate matched line impedances and method of...

2005-12-06

2005-12-06

Le, Don (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S082000, C326S093000

Reexamination Certificate

active

06972590

ABSTRACT:
A data bus for a printed circuit board is disclosed having a plurality of lines separated by a substrate. A method is also disclosed for creating a bus with a reduced reflection of signal energy at the interface between the bus and a receiving agent connected to the bus. The lines in the bus include data lines and at least two strobe lines that are positioned adjacent each other to take advantage of the known impedance inherent to their dominant coupling. The bus includes separate data-line terminations and strobe-line terminations connected to the data lines and strobe lines, respectively. The separate terminations have values matched to impedances calculated from the separate sets of lines to more effectively reduce the reflected energy by more accurately matching the impedances on the lines.

REFERENCES:
patent: 4450370 (1984-05-01), Davis
patent: 5025412 (1991-06-01), Dalrymple et al.
patent: 5550804 (1996-08-01), Haussler et al.
patent: 6118350 (2000-09-01), Gupta et al.
patent: 6141765 (2000-10-01), Sherman
patent: 6177807 (2001-01-01), Bertin et al.
patent: 6338635 (2002-01-01), Lee
patent: 6392446 (2002-05-01), Reasoner et al.
patent: 6480020 (2002-11-01), Jung et al.

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