Boots – shoes – and leggings
Patent
1991-02-22
1993-12-28
Canney, Vincent P.
Boots, shoes, and leggings
36492691, 36492793, G06F 1130
Patent
active
052748006
ABSTRACT:
A system and method are disclosed for automatically configuring the interconnection of circuit boards in slots on the backplane of a computer. Some signal lines, such as bus grant and interrupt acknowledge signals, must be daisy-chained, or connected in series through the circuit boards collectively. However, if a circuit board is not present, then the daisy-chain is broken. For each slot to be monitored in the backplane, the present invention envisions implementing a generator, a valid logic level detector and a signal selector. The generator imposes an invalid logic signal onto an output connector of a slot to derive an input for the valid logic level detector. Based upon the input, the detector determines whether a circuit board resides in the slot. Accordingly, the detector adjusts the signal selector to either bypass the slot or connect the slot, as well as the present circuit board, to the daisy-chain.
REFERENCES:
patent: 4825438 (1989-04-01), Bennett et al.
Babb Samuel M.
Speer Martin L.
Canney Vincent P.
Hewlett--Packard Company
Kelley Guy J.
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