Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1994-11-14
1996-12-10
Westin, Edward P.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
326 16, H03K 1900, H03K 1716
Patent
active
055834485
ABSTRACT:
A system has the capability to determine the termination status of a data-communication bus therein. The system includes a source of a bus signal from a bus, a selectively activated current sink that communicates with the source of the bus signal, with a detection activation input, and a source of a detection signal in communication with the detection activation input of the current sink. There is a source of a first reference voltage, and a source of a second reference voltage, the second reference voltage being less than the first reference voltage. A high-termination comparator has an upper voltage input that communicates with the source of the bus signal, a lower voltage input that communicates with the source of the first reference voltage, and a logical high-termination output. A low-termination comparator has a lower voltage input that communicates with the source of the bus signal, an upper voltage input that communicates with the source of the second reference voltage, and a logical low-termination output. The detection circuitry is activated by applying a voltage through the source of the detection signal when the bus is idle and a near-end, local termination of the bus is disconnected, and monitoring the logical high-termination and the logical low-termination outputs.
REFERENCES:
patent: 4748426 (1988-05-01), Stewart
patent: 4841232 (1989-06-01), Graham et al.
patent: 5434516 (1995-07-01), Kosco
patent: 5473264 (1995-12-01), Mader et al.
Bill Stanley, "Automatic Termination Method 2", Adaptec Corporation Plug and Play SCSI Workship, Jun. 8, 1994, pp. 5-8.
Coleman Scott
Corder Rodney
Stockwell Davin
Garmong Gregory
New Media Corp.
Roseen Richard
Westin Edward P.
LandOfFree
System bus termination status detection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System bus termination status detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System bus termination status detection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-426267