H - Electricity – 05 – K
Patent
H - Electricity
05
K
354/221
H05K 7/14 (2006.01) G06F 13/40 (2006.01)
Patent
CA 1283484
METHOD AND APPARATUS FOR CONTROLLED REMOVAL AND INSERTION OF CIRCUIT MODULES 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. This prevents other circuits from accessing a bus and also prevents extraneous pulses which may occur on the bus during removal of the circuit pack from propagating to other circuits connected to the bus. When the bus has been disabled, the state machine causes a signal to be sent to power supply circuitry which responds by removing power from the board to be removed. When contact is physically broken between the board and its corresponding connector, an open circuit condition is sensed by the finite state machine causing it to restore the bus clock pulses and to relinquish control of the bus. When a board is to be inserted in an open connector, the latch will be in the operated position and a closed circuit condition will result upon contact of the board with the connector. This condition is sensed by the finite state machine which will cause the bus to be seized and the bus clock pulses to be temporarily inhibited. When the board is fully inserted and the latch is closed, a signal will be sent through the switch to power supply circuitry to apply power to the newly inserted board. Furthermore, the finite state machine will restore the bus clock pulses and relinquish control of the bus.
540842
Herrig Hanz Werner
Horn David Nicholas
Peters Daniel Vern
Pfeifer Randy Dean
Wilcox Wayne Richard
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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