Patent US6029216A successfully refreshed from Google Patents.
US6029216A
Expired / Lapsed
US
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Auto-termination method and apparatus for use with either active high or active low terminators
Assignee: Avago Technologies International Sales Pte Ltd
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Filing: 1997-06-27
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Granted: 2000-02-22
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Expires: 2017-06-27
Abstract
Abstract An auto-termination method and apparatus for use with either active high or active low terminators are disclosed. The method includes the steps of (a) forcing a terminator to a first state by impressing a first voltage upon an input of the terminator; (b) determining, from the first voltage, a second voltage that when applied to the input of the terminator places the terminator in a second state; and (c) selectively forcing the terminator to the second state by impressing the second voltage upon the input of the terminator. The apparatus includes a terminator and a controller. The terminator is coupled to the bus and includes an input that is coupled to a first voltage that forces the terminator to a first state. The controller is coupled to the input of the terminator and is configured to determine the voltage of the first voltage coupled to the input of the terminator and to selectively force the terminator to a second state by impressing a second voltage upon the input of the terminator that is different than the first voltage.
Inventors
- 👤 Timothy E. Hoglund
- 👤 Erich S. Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:48
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4086
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
A method of terminating a bus, comprising the steps of: forcing a terminator to a first state by impressing a first voltage upon an input of the terminator; determining, from the first voltage, a second voltage that when applied to the input of the terminator places the terminator in a second state; and selectively forcing the terminator to the second state by impressing the second voltage upon the input of the terminator.
Claim 2
Independent Claim
72 words
A method of terminating a bus, comprising the steps of: forcing a terminator to a first state by impressing a first voltage upon an input of the terminator; determining, from the first voltage, a second voltage that when applied to the input of the terminator places the terminator in a second state; and selectively forcing the terminator to the second state by impressing the second voltage upon the input of the terminator.
Claim 3
Dependent Claim
43 words
The method of claim 1, wherein: the step of forcing the terminator to the first state includes the step of enabling the terminator; and the step of selectively forcing the terminator to the second state includes the step of selectively disabling the terminator.
Claim 4
Dependent Claim
43 words
The method of claim 1, wherein: the step of forcing the terminator to the first state includes the step of disabling the terminator; and the step of selectively forcing the terminator to the second state includes the step of selectively enabling the terminator.
Claim 5
Dependent Claim
30 words
The method of claim 1, wherein the step of forcing the terminator to the first state includes the step of: coupling the input of the terminator to a reference voltage.
Claim 6
Dependent Claim
44 words
The method of claim 1, wherein the step of selectively forcing the terminator to the second state includes the steps of: determining whether a first device is coupled to a first port; and determining whether a second device is coupled to a second port.
Claim 7
Dependent Claim
37 words
The method of claim 1, wherein the step of selectively forcing the terminator to the second state includes the step of: executing a plurality of instructions to determine whether to force the terminator to the second state.
Claim 8
Dependent Claim
39 words
The method of claim 6, wherein the step of selectively forcing the terminator to the second state further includes the step of: configuring a pin of a controller to impress the second voltage upon the input of the terminator.
Claim 9
Independent Claim
88 words
A device interface for controlling a bus, comprising: a terminator coupled to the bus and comprising an input that is coupled to a first voltage that forces said terminator to a first state; and a controller coupled to said input of said terminator and configured to determine the level of said first voltage coupled to said input of said terminator and to selectively force said terminator to a second state by impressing a second voltage upon said input of said terminator that is different than said first voltage.
Claim 10
Independent Claim
88 words
A device interface for controlling a bus, comprising: a terminator coupled to the bus and comprising an input that is coupled to a first voltage that forces said terminator to a first state; and a controller coupled to said input of said terminator and configured to determine the level of said first voltage coupled to said input of said terminator and to selectively force said terminator to a second state by impressing a second voltage upon said input of said terminator that is different than said first voltage.
Claim 11
Dependent Claim
21 words
The device interface of claim 8, wherein said first state disables said terminator; and wherein said second state enables said terminator.
Claim 12
Dependent Claim
21 words
The device interface of claim 8, wherein said first state enables said terminator; and wherein said second state disables said terminator.
Claim 13
Dependent Claim
34 words
The device interface of claim 8, further comprising: a device driver comprising a plurality of instructions that when executed by a processor configures said controller to selectively force said terminator to said second state.
Claim 14
Dependent Claim
84 words
The device interface of claim 8, further comprising: a first port configured to receive and to couple a first device to the bus; and a second port configured to receive and to couple a second device to the bus; and wherein said controller is further coupled to said first port and to said second port and is further configured to detect whether said first device is coupled to said first port and to detect whether said second device is coupled to said second port.
Claim 15
Dependent Claim
50 words
The device interface of claim 12, further comprising: a device driver comprising a plurality of instructions that when executed configures said controller to force said terminator to said second state when said first device is coupled to said first port and said second device is coupled to said second port.
Claim 16
Dependent Claim
125 words
A data processing system, comprising: a bus; a terminator coupled to said bus, said terminator comprising an input that is coupled to a first voltage that forces said terminator to a first state; a controller coupled to said first port, to said second port, and to said input of said terminator; a processor coupled to said bus via said bus controller; and a memory coupled to the processor and having stored therein a plurality of instructions that when executed by said processor configure said controller to determine the level of said first voltage coupled to said terminator and to selectively force said terminator to a second state by impressing a second voltage upon said input of said terminator that is different than said first voltage.
Claim 17
Dependent Claim
125 words
A data processing system, comprising: a bus; a terminator coupled to said bus, said terminator comprising an input that is coupled to a first voltage that forces said terminator to a first state; a controller coupled to said first port, to said second port, and to said input of said terminator; a processor coupled to said bus via said bus controller; and a memory coupled to the processor and having stored therein a plurality of instructions that when executed by said processor configure said controller to determine the level of said first voltage coupled to said terminator and to selectively force said terminator to a second state by impressing a second voltage upon said input of said terminator that is different than said first voltage.
Claim 18
Dependent Claim
21 words
The data processing system of claim 14, wherein: said first state disables said terminator; and said second state enables said terminator.
Claim 19
Dependent Claim
21 words
The data processing system of claim 14, wherein: said first state enables said terminator; and said second state disables said terminator.
Claim 20
Dependent Claim
70 words
The data processing system of claim 14, further comprising: a first port configured to receive and couple a first device to said bus; and a second port configured to receive and couple a second device to said bus; and wherein said controller is further configured to detect whether a first device is coupled to said first port and to detect whether a second device is coupled to said second port.
Claim 21
Dependent Claim
54 words
The data processing system of claim 17, wherein said memory further comprises a plurality of instructions that when executed by said processor further configures said controller to force said terminator to said second state when said first device is coupled to said first port and said second device is coupled to said second port.
References Cited (Backward Citations)
US4220876A
Cited
US4367525A
Cited
EP0076921A2
Cited
US4748426A
Cited
JPS6414624A
Cited
US4965723A
Cited
US5455926A
Cited
JPH01259442A
Cited
US4831283A
Cited
US5157771A
Cited
US4920339A
Cited
US5101481A
Cited
US5410141A
Cited
US5239658A
Cited
US5327114A
Cited
US5029284A
Cited
US5204669A
Cited
US5099137A
Cited
US5191581A
Cited
US5553250A
Cited
US5265038A
Cited
US5120909A
Cited
US5367647A
Cited
US5338979B1
Cited
US5338979B2
Cited
US5338979A
Cited
EP0531630A1
Cited
US5511229A
Cited
US5239559A
Cited
US5382841A
Cited
JPH05224792A
Cited
US5313105A
Cited
US5574946A
Cited
WO1994008035A1
Cited
US5473264A
Cited
US5313595A
Cited
US5495584A
Cited
US5715409A
Cited
US5434516A
Cited
US5467453A
Cited
EP0645716A1
Cited
US5422580A
Cited
US5450425A
Cited
EP0671691A2
Cited
US5585741A
Cited
US5585741B1
Cited
US5469554A
Cited
US5555510A
Cited
US5564024A
Cited
US5510701A
Cited
US5568046A
Cited
US5465042A
Cited
US5586271A
Cited
US5583448A
Cited
US5613074A
Cited
US5751977A
Cited
US5680537A
Cited
US5546017A
Cited
EP0742612A2
Cited
US5635583A
Cited
US5680555A
Cited
US5664221A
Cited
US5768621A
Cited
US5781028A
Cited
US5764925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-21 | 2003-08-23 | 2004-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-21 | 2007-08-23 | 2008-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-21 | 2011-08-23 | 2012-02-22 | $7700.00 | Window Closed / Lapsed |