Expansion port providing system power-down prior to connection o

Details Expansion port providing system power-down prior to connection o Expansion port providing system power-down prior to connection o

1997-05-16

1999-08-03

Sheikh, Ayaz R.

Electrical computers and digital processing systems: support

Computer power control

710101, G06F 100

Patent

active

059319496

ABSTRACT:
An expansion port for a processing system peripheral device provides for a system power down prior to connection of another device to the port. A number of devices in a processing system are connected in a daisy chain. One of the devices includes a power supply for supplying power to each of the devices. Each of the devices includes a segment of an enable circuit for enabling or disabling the power supply. Each of the devices further includes an expansion port for connecting the enable circuit and other signals to another device in the daisy chain. An access panel is provided to cover the expansion port when the port is not in use. When the access panel is closed a switch located at the expansion port and coupled to the enable circuit of the device is actuated in order to enable the power supply. When the access panel is not in place and no other device is connected to the expansion port, the switch is in a different position which causes the power supply to be disabled. If another device is properly connected to the expansion port, then the switch is in the first position to cause the power supply to be enabled, provided all other devices in the daisy chain are also properly connected. Accordingly, removal of an access panel on one of the devices while power to the system is on causes power to the system to be removed before another device can be connected to the expansion port, thus preventing damaging electrical transients from occurring upon connection to the expansion port.

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patent: 5628637 (1997-05-01), Pecone et al.
patent: 5726922 (1998-03-01), Womble et al.
patent: 5758101 (1998-05-01), Pemberton

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