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US5748910A
Expired / Lapsed
US
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Automatic enabling/disabling of termination impedance for a computer bus
Assignee: Hewlett Packard Development Co LP
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Filing: 1996-01-31
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Granted: 1998-05-05
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Expires: 2016-01-31
Abstract
Abstract A system and method for automatically enabling and disabling a termination impedance circuit for a computer bus. A peripheral device on the computer bus has two external bus connectors. A connector cover is provided for at least one of the peripheral bus connectors. The connector cover must be removed before a mating bus cable connector can be attached. The presence or absence of the connector cover is detected by sensor within the peripheral device. If a connector cover is detected, one of the peripheral bus connectors must be open (not connected to the bus) and termination is enabled. If a connector cover is not detected, termination is disabled. In one embodiment, the connector cover has a projection that passes into the peripheral device. In an alternative embodiment, a reflective surface is used. The cover may optionally be captured by a hinged edge or attached via a tether.
Inventors
- 👤 Oscar R. Herrera E.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:58
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4072; G06F13/4077; G06F13/4086; H; H01; H01R; H01R13/00; H01R13/66; H01R13/70; H01R13/701; H01R2201/00; H01R2201/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
An apparatus for controlling a termination impedance circuit in a device on a computer bus, the apparatus comprising: a connector cover; a sensor in the device detecting the presence of the connector cover; and the sensor having a signal controlling enabling and disabling of the termination impedance circuit, the signal causing the termination impedance circuit to be enabled when the sensor detects the presence of the connector cover.
Claim 2
Independent Claim
68 words
An apparatus for controlling a termination impedance circuit in a device on a computer bus, the apparatus comprising: a connector cover; a sensor in the device detecting the presence of the connector cover; and the sensor having a signal controlling enabling and disabling of the termination impedance circuit, the signal causing the termination impedance circuit to be enabled when the sensor detects the presence of the connector cover.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1; the connector cover further comprising a projection; and the sensor detecting the presence of the projection.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1; the connector cover further comprising a reflective surface; and the sensor detecting the presence of the reflective surface.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1, the connector cover further comprising a hinged edge, attaching the connector cover to the device.
Claim 6
Dependent Claim
18 words
The apparatus of claim 1 further comprising a tether attached to the device and to the connector cover.
Claim 7
Independent Claim
80 words
A method for automatic termination of a computer bus by a peripheral device on the computer bus, the method comprising the following steps: (a) covering a connector on the peripheral device, by a cover, when the connector is not connected to the computer bus; (b) detecting, by a sensor within the peripheral device, whether the cover is covering the connector; and (c) enabling termination by a termination impedance circuit when the sensor detects that the cover is covering the connector.
Claim 8
Independent Claim
80 words
A method for automatic termination of a computer bus by a peripheral device on the computer bus, the method comprising the following steps: (a) covering a connector on the peripheral device, by a cover, when the connector is not connected to the computer bus; (b) detecting, by a sensor within the peripheral device, whether the cover is covering the connector; and (c) enabling termination by a termination impedance circuit when the sensor detects that the cover is covering the connector.
Claim 9
Dependent Claim
18 words
The method of claim 6, step (b) further comprising detecting, by the sensor, a projection on the cover.
Claim 10
Dependent Claim
19 words
The method of claim 6, step (b) further comprising detecting, by the sensor, a reflective surface on the cover.
References Cited (Backward Citations)
US5313595A
Cited
US5434516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |