Electrical pulse counters – pulse dividers – or shift registers: c – Counting or dividing in incremental steps – Beam type tube
Patent
1997-06-23
2000-08-01
De Cady, Albert
Electrical pulse counters, pulse dividers, or shift registers: c
Counting or dividing in incremental steps
Beam type tube
377 72, 380 46, G06F 1500
Patent
active
060978899
ABSTRACT:
According to the present invention, an LFSR (300) has a propagation path (30) of serially coupled stages (65) and gates (80-3, 80-4), a feedforward path (10) of gates (80-1) and a feedback path (20) of gates (80-2). Depending on control signals (P, B, M), the gates (80-1, 80-2, 80-3, 80-4) are either active gates and operate as xor-gates or passive gates and operate as transfer gates. Feedforward and feedback signals are derived from input and output signals and can be supplied to any stage (65), so that characteristic polynomials of the input-output function are variable. The LFSR can fully or partly operate as a TYPE 1 or TYPE 2 LFSR which enables the execution of different algorithms on one hardware base.
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Bernard Sklar The Aerospace Corporation, El Segundo, California and University of California, Los Angeles "Digital Communications Fundamentals and Applications", Prentice Hall Englewood Cliffs, New Jersey 07632, pp. 292-293.
Belotserkovsky Leonid
Borowitz Eli
Engel Eytan
Tarrab Moshe
Cady Albert De
Duff Kenneth W
Motorola Inc.
Witek Keith E.
Zahn Mathas
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