Method and apparatus for controlled removal and insertion of circuit modules
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United States of America Patent
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May 30, 1989
Grant Date -
N/A
app pub date -
Jul 21, 1986
filing date -
Jul 21, 1986
priority date (Note) -
Expired
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Abstract
An electronic circuit board electrically connected to other circuits of a data processing system by means of a bus, may be removed and re-inserted in the system without the necessity of disabling other circuits connected to the bus. A latch actuated switch provides a control signal in anticipation of circuit board removal. The control signal activates a finite state machine which seizes control of the bus after completion of any current bus communications and stops the generation of clock pulses normally required in bus communications. When contact is physically broken between the board and its corresponding connector, the finite state machine restores the bus clock pulses and relinquishes control of the bus. When a board is to be inserted in an open connector, contact between the board and the connector is sensed by the finite state machine which causes the bus to be seized and the bus clock pulses to be temporarily inhibited. When the board is fully inserted, the finite state machine restores the bus clock pulses and relinquishes control of the bus.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- AGERE SYSTEMS INC.;AMERICAN TELEPHONE AND TELEGRAPH COMPANY;AT&T INFORMATION SYSTEMS INC.;BELL TELEPHONE LABORATORIES, INCORPORATED
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Herrig, Hanz W | Aurora, IL | 1 | 255 |
Horn, David N | Rumson, NJ | 10 | 703 |
Peters, Daniel V | Warrenville, IL | 5 | 339 |
Pfeifer, Randy D | Warrenville, IL | 6 | 354 |
Wilcox, Wayne R | Naperville, IL | 5 | 304 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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