Michael Craig Bowman

US Patent:

55111718, Apr 23, 1996

Filed:

Feb 26, 1993

Appl. No.:

8/024189

Inventors:

Michael H. Bowman - Palo Alto CA

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

G06F 1300
H01R 909
H01R 1302
H01R 13642

US Classification:

395283

Abstract:

An apparatus for allowing an add-on device to be inserted onto an active bus and configurable within one bus cycle is provided. The apparatus includes passive circuits used with a sequential multi-length pin arrangement on an I/O module. The apparatus also decouples the source of power to the I/O module from other devices on the bus which limits the disruption of power during the insertion. The I/O module limits current drawn from a backplane containing the bus which may disrupt signals during the insertion of the add-on device. And finally, the I/O module also limits bus signal disruption during insertion by precharging signal pins, increasing the resistance between the add-on I/O module pins and the backplane and adding capacitance to the bus.

US Patent:

55308104, Jun 25, 1996

Filed:

Jun 7, 1995

Appl. No.:

8/473203

Inventors:

Michael H. Bowman - Palo Alto CA

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

G06F 1300
H01R 1302
H01R 13642

US Classification:

395283

Abstract:

An apparatus for allowing an add-on device to be inserted onto an active bus and configurable within one bus cycle is provided. The apparatus includes passive circuits used with a sequential multi-length pin arrangement on an I/O module. The apparatus also decouples the source of power to the I/O module from other devices on the bus which limits the disruption of power during the insertion. The I/O module limits current drawn from a backplane containing the bus which may disrupt signals during the insertion of the add-on device. And finally, the I/O module also limits bus signal disruption during insertion by precharging signal pins, increasing the resistance between the add-on I/O module pins and the backplane and adding capacitance to the bus.