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Programmable PCI/DASD/Other load pass through card

IP.com Disclosure Number: IPCOM000030958D
Original Publication Date: 2004-Sep-02
Included in the Prior Art Database: 2004-Sep-02
Document File: 2 page(s) / 61K

Publishing Venue



An electronically controlled PCI load card is presented to assist in the testing and manufacture of PCI based backplane and motherboard solutions.

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Programmable PCI/DASD/Other load pass through card

This invention solves the problem of validating complex PCI backplanes where many slots concurrently can draw the maximum power allowable by the PCI specification. This is a difficult condition to test, and must currently be done with static resistor banks soldered to dummy PCI cards. The problem with this is that new PCI backplanes are more sophisticated, and will not power up a slot unless the card has some intelligence, rather than just resistors. This is a function of defective card isolation on the PCI bus, usually accomplished by using industry standard hot-plug controllers.

     The basic principle of operation is a PCI form factor device that has an electronic load facility installed on it capable of operating in constant current, resistance, or power loading modes via microprocessor control. Continuously variable power loading is possible with this design.


1.) PCI form factor with pass through

This allows us to plug in a real PCI card so the slot remains active... Without this the slot would initialize and turn of after some short time, possibly by the operating system)

2.) Microprocessor controlled load bank

Microprocessor is used to regulate the power consumed or burned up by the MOSFET. Assume well designed control loops that are properly compensated and damped. Possible a programmable hysteresis in the software.

3.) External communications interface.

Allows some external device to...