US5859985A
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US
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Arbitration controller for providing arbitration on a multipoint high speed serial bus using drivers having output enable pins
Assignee: Clear Wireless LLC
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Filing: 1997-03-26
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Granted: 1999-01-12
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Expires: 2017-03-26
Abstract
Abstract An arbitration controller provides arbitration on a multipoint, high speed serial bus with a plurality of drivers. Each driver includes a data input pin, an output enable pin, and an output pin. The bus defaults to a first state when the output of the plurality of drivers are set to high impedance. The arbitration controller eliminates any unstable output states on the drivers by controlling the input signals on the drivers. The arbitration controller detects when the bus is in an arbitration mode. When this is detected, the arbitration controller inputs data to the output enable pin and inputs an opposite state of the first state to the data input pin. Further, the arbitration controller detects when the bus is in a data mode. When this is detected, the arbitration controller inputs data to the data input pin and inputs a driver control signal to the output enable pin.
Inventors
- 👤 Eamonn Gormley
- 👤 James M. Hite
- 👤 Chad A. Pralle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:29
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40052; H04L12/40084; G; G06; G06F; G06F13/00; G06F13/14; G06F13/36
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
124 words
A method of interfacing with a first driver to provide arbitration on a multipoint, high speed serial bus coupled to a plurality of drivers, wherein the first driver includes a data input pin, an output enable pin, and an output pin, and wherein the bus defaults to a first state when the output of each driver coupled to the bus is set to high impedance, comprising the steps of: a) detecting when the bus is in an arbitration mode; b) inputting data to the output enable pin when the bus is detected to be in the arbitration mode; and c) inputting an opposite state of the first state to the data input pin when the bus is detected to be in the arbitration mode.
Claim 2
Independent Claim
124 words
A method of interfacing with a first driver to provide arbitration on a multipoint, high speed serial bus coupled to a plurality of drivers, wherein the first driver includes a data input pin, an output enable pin, and an output pin, and wherein the bus defaults to a first state when the output of each driver coupled to the bus is set to high impedance, comprising the steps of: a) detecting when the bus is in an arbitration mode; b) inputting data to the output enable pin when the bus is detected to be in the arbitration mode; and c) inputting an opposite state of the first state to the data input pin when the bus is detected to be in the arbitration mode.
Claim 3
Dependent Claim
62 words
The method of claim 1, further comprising the steps of: d) detecting when the bus is in a data mode; e) inputting data to the data input pin when the bus is detected to be in the data mode; and f) inputting a driver control signal to the output enable pin when the bus is detected to be in the data mode.
Claim 4
Dependent Claim
21 words
The method of claim 2, wherein the serial bus complies with the Institute of Electrical and Electronic Engineers (IEEE) 1394 standard.
Claim 5
Dependent Claim
16 words
The method of claim 2, wherein the first driver is a low voltage differential signaling driver.
Claim 6
Dependent Claim
13 words
The method of claim 2, wherein the first state is a logical 1.
Claim 7
Dependent Claim
124 words
An arbitration controller for providing arbitration on a multipoint high speed serial bus coupled to a plurality of drivers, wherein said arbitration controller is coupled to a bus interface controller and the bus, and wherein the bus defaults to a first state when the output of each driver coupled to the bus is set to high impedance, said arbitration controller comprising: an input adapted to receive data; a first output coupled to a data input pin of a first driver; and a second output coupled to an output enable pin of said first driver; controller logic that, when the bus is in arbitration mode, sends said data to said second output and sends an opposite state of said first state to said first output.
Claim 8
Dependent Claim
124 words
An arbitration controller for providing arbitration on a multipoint high speed serial bus coupled to a plurality of drivers, wherein said arbitration controller is coupled to a bus interface controller and the bus, and wherein the bus defaults to a first state when the output of each driver coupled to the bus is set to high impedance, said arbitration controller comprising: an input adapted to receive data; a first output coupled to a data input pin of a first driver; and a second output coupled to an output enable pin of said first driver; controller logic that, when the bus is in arbitration mode, sends said data to said second output and sends an opposite state of said first state to said first output.
Claim 9
Dependent Claim
40 words
The arbitration controller of claim 6, wherein said controller logic, when the bus is in data mode, sends said data to said first output and sends a driver control signal received from said bus interface controller to said second output.
Claim 10
Dependent Claim
14 words
The arbitration controller of claim 7, wherein said controller logic defines a state machine.
Claim 11
Dependent Claim
21 words
The arbitration controller of claim 7, wherein the bus complies with the Institute of Electrical and Electronic Engineers (IEEE) 1394 standard.
Claim 12
Dependent Claim
17 words
The arbitration controller of claim 7, wherein said first driver is a low voltage differential signaling driver.
Claim 13
Dependent Claim
14 words
The arbitration controller of claim 7, wherein said first state is a logical 1.
Claim 14
Dependent Claim
13 words
The arbitration controller of claim 7, wherein said controller logic comprises software instructions.
Claim 15
Dependent Claim
22 words
The arbitration controller of claim 7, wherein said controller logic comprises: an inverter; a flip-flop; an OR gate; and an AND gate.
Claim 16
Dependent Claim
121 words
An arbitration controller interfaced with a first driver for providing arbitration on a multipoint, high speed serial bus coupled to a plurality of drivers, wherein the first driver includes a data input pin, an output enable pin, and an output pin, and wherein the bus defaults to a first state when the output of each driver coupled to the bus is set to high impedance, said arbitration controller comprising: means for detecting when the bus is in an arbitration mode; means for inputting data to the output enable pin when the bus is in the arbitration mode; and means for inputting an opposite state of the first state to the data input pin when the bus is in the arbitration mode.
Claim 17
Dependent Claim
121 words
An arbitration controller interfaced with a first driver for providing arbitration on a multipoint, high speed serial bus coupled to a plurality of drivers, wherein the first driver includes a data input pin, an output enable pin, and an output pin, and wherein the bus defaults to a first state when the output of each driver coupled to the bus is set to high impedance, said arbitration controller comprising: means for detecting when the bus is in an arbitration mode; means for inputting data to the output enable pin when the bus is in the arbitration mode; and means for inputting an opposite state of the first state to the data input pin when the bus is in the arbitration mode.
Claim 18
Dependent Claim
57 words
The arbitration controller of claim 14, further comprising: means for detecting when the bus is in a data mode; means for inputting data to the data input pin when the bus is in the data mode; and means for inputting a driver control signal to the output enable pin when the bus is in the data mode.
Claim 19
Dependent Claim
22 words
The arbitration controller of claim 15, wherein the serial bus complies with the Institute of Electrical and Electronic Engineers (IEEE) 1394 standard.
Claim 20
Dependent Claim
17 words
The arbitration controller of claim 15, wherein the first driver is a low voltage differential signaling driver.
Claim 21
Dependent Claim
14 words
The arbitration controller of claim 15, wherein the first state is a logical 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |