Electrical computers and digital processing systems: support – Digital data processing system initialization or configuration
Reexamination Certificate
2006-07-24
2009-12-08
Cao, Chun (Department: 2116)
Electrical computers and digital processing systems: support
Digital data processing system initialization or configuration
C713S100000, C327S143000, C327S151000
Reexamination Certificate
active
07631176
ABSTRACT:
A resistor/capacitor identification detection (RCID) circuit may provide system level identification of hardware (e.g. circuit board ID) through a single pin interface, by identifying up to a specified number of more than two quantized RC time constant states by measuring the discharge and charge times of an external RC circuit coupled to the single pin. The RCID circuit may initiate the discharge followed by a charging of the external RC circuit. The signal developed at the signal pin may be provided to the input of a threshold detector, with the threshold set at a specified percentage of a supply voltage used for operating the RCID circuit. The digitized output of the threshold detector may be used to gate a counter, after having been filtered through an input glitch rejection filter. A resolution of the counter may be determined by a high frequency clock used for clocking the counter. The numeric values of the charge and discharge times may be stored in data registers comprised in the RCID circuit.
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Goldberg Randy B.
Virzi John D.
Wahler Richard E.
Weiss Raphael
Cao Chun
Hood Jeffrey C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Standard Microsystems Corporation
Stoynov Stefan
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