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US5757249A
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Communication system having a closed loop bus structure
Assignee: Avago Technologies International Sales Pte Ltd
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Filing: 1996-10-08
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Granted: 1998-05-26
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Expires: 2016-10-08
Abstract
Abstract A communication system having communicating devices coupled to a closed loop bus substantially reduces interconnect distances and corresponding signal propagation delays between the devices. Particular devices possess switchable impedance elements that can be selectively actuated to produce an effective terminating impedance substantially at a midpoint position along the closed loop from the coupling point of a transmission device. In such an arrangement, the produced effective terminating impedance would cause the signal transmitted by the transmission device to propagate to a destination device substantially without signal degradation due to signal reflections.
Inventors
- 👤 Thaddeus John Gabara
- 👤 Bernard Lee Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:54
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L25/00; H04L25/02; H04L25/0264; H04L25/0298; H04L12/40
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
An arrangement of devices comprising: a closed loop signal bus; a plurality of devices coupled to said bus, at least one of said devices being a transmission device for transmitting signals over said bus to at least one other of said devices; and at least two other of said devices being coupled at respective positions along said closed loop bus, said at least two other devices including respective switchable impedance elements, said switchable impedance elements being actuatable to provide respective impedances on said bus that in combination produce an effective terminating impedance substantially at a midpoint along said closed loop bus from said transmission device for a signal transmitted by said transmission device.
Claim 2
Dependent Claim
113 words
An arrangement of devices comprising: a closed loop signal bus; a plurality of devices coupled to said bus, at least one of said devices being a transmission device for transmitting signals over said bus to at least one other of said devices; and at least two other of said devices being coupled at respective positions along said closed loop bus, said at least two other devices including respective switchable impedance elements, said switchable impedance elements being actuatable to provide respective impedances on said bus that in combination produce an effective terminating impedance substantially at a midpoint along said closed loop bus from said transmission device for a signal transmitted by said transmission device.
Claim 3
Dependent Claim
50 words
The arrangement of claim 1 wherein said other devices are two devices coupled at substantially symmetrical positions along respective halves of said bus defined by said coupling position of said transmission device and said corresponding midpoint, and wherein said two devices have switchable impedance elements of substantially Z 0 .
Claim 4
Dependent Claim
18 words
The arrangement of claim 1 wherein said switchable impedance element is an impedance element coupled to a switch.
Claim 5
Dependent Claim
20 words
The arrangement of claim 1 wherein said transmission device is capable of transmitting a signal in accordance with Gunning-transceiver-logic standard.
Claim 6
Dependent Claim
12 words
The arrangement of claim 1 wherein said devices are integrated circuit devices.
Claim 7
Dependent Claim
22 words
The arrangement of claim 1 wherein at least one of said devices is coupled to said bus by a transmission line interconnect.
Claim 8
Dependent Claim
18 words
The arrangement of claim 1 wherein at least one of said devices is directly connected to said bus.
Claim 9
Dependent Claim
22 words
The arrangement of claim 1 wherein said closed loop bus is formed on, and said devices are mounted to, a single substrate.
Claim 10
Independent Claim
80 words
A method for communication between a plurality of devices coupled to a closed loop bus comprising: actuating switchable impedance elements in at least two other devices coupled at respective positions on said bus to provide respective impedances to said bus that in combination produce an effective terminating impedance substantially at a midpoint along said closed loop bus from a coupling position of a transmission device; and transmitting a signal on said bus by said transmission device to a destination device.
Claim 11
Independent Claim
80 words
A method for communication between a plurality of devices coupled to a closed loop bus comprising: actuating switchable impedance elements in at least two other devices coupled at respective positions on said bus to provide respective impedances to said bus that in combination produce an effective terminating impedance substantially at a midpoint along said closed loop bus from a coupling position of a transmission device; and transmitting a signal on said bus by said transmission device to a destination device.
Claim 12
Dependent Claim
65 words
The method of claim 9 wherein said other devices are two devices coupled at substantially symmetrical positions along respective halves of said bus defined by said coupling position of said transmission device and said corresponding midpoint and wherein said step of actuating said switchable impedance elements of said other devices produces first and second effective impedances of substantially Z 0 at said substantially symmetrical positions.
Claim 13
Dependent Claim
15 words
The method of claim 9 wherein said transmitted signal is in accordance with Gunning-transceiver-logic standard.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |