Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Reexamination Certificate
2008-03-20
2009-11-24
Nguyen, Vincent Q (Department: 2831)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
Reexamination Certificate
active
07622908
ABSTRACT:
A built-in self-test system for a dynamic random access memory device using a data output register of the memory device to apply test signals to data bus terminals and a data strobe terminal of the memory device responsive to respective clock signals. The clock signal are generated by a test system oscillator and coupled through a clock tree of the memory device. The test system further includes a selector that sequentially selects each of the test signals applied to the data bus terminals and applies the selected test signal to a multi-phase generator. The multi-phase generator delays the selected signal by different time to generate a set of delayed signals. The phases of the delayed signals are compared to the test signal applied to the data strobe terminal to determine the delay of the compared signals relative to each other, thereby determining the timing parameter.
REFERENCES:
patent: 6850051 (2005-02-01), Roberts et al.
patent: 2005/0162948 (2005-07-01), Swanson et al.
Dorsey & Whitney LLP
Micro)n Technology, Inc.
Nguyen Vincent Q
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