Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Using shift register
Patent
1996-08-27
1997-12-02
Wambach, Margaret Rose
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Using shift register
377 20, 377 75, G11C 1900
Patent
active
056944446
ABSTRACT:
An integrated circuit counter is capable of implementing a relatively high count while being testable using a relatively low number of clock cycles. A linear-feedback shift register (LFSR) having n bit positions is used as the counter. The feedback path of the shift register includes an exclusive OR (XOR) gate that couples selected bits back to the input of the register, in order to implement a 2.sup.n -1 counter. Combinatorial logic circuitry is included to test the counter in significantly less than 2.sup.n -1 clock cycles. This allows for implementing a testable "watchdog timer" that may be used to detect software runaway conditions in microprocessor systems, among other uses.
REFERENCES:
patent: 5542051 (1996-07-01), Farrell et al.
Bagchi Sonali
Fadavi-Ardekani Jalil
Fitch Kenneth Daniel
Takise Daisuke
Fox James H.
Lucent Technologies - Inc.
Wambach Margaret Rose
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