Electrical pulse counters – pulse dividers – or shift registers: c – Shift register – Particular transfer means
Patent
1998-02-04
1999-11-16
Wambach, Margaret R.
Electrical pulse counters, pulse dividers, or shift registers: c
Shift register
Particular transfer means
377 80, 377 81, 377 73, G11C 1900
Patent
active
059870907
ABSTRACT:
A new class of shift registers that shift the contents of a 2.sup.n bit length register up to 2.sup.n -1 positions in n cycles. Shift registers according to the present invention can be constructed to shift left, shift right, or to shift either left or right. A general implementation of this class of shift registers comprises the following hardware: 2.sup.n D flip-flops or D latches for the data register positions of the shift register; logic for each of the 2.sup.n positions to determine the input value to which the position should take on at each of the n cycles; an n bit shift count register to store a value indicating the number of positions to shift; control lines specifying whether to shift left or right; n control lines which are sequentially raised for one cycle to select a bit in the shift count register for the current cycle beginning with the most significant bit and continuing sequentially to the least significant bit; and a clock to set the selected input data to each position in the shift register.
REFERENCES:
patent: 4688236 (1987-08-01), DuPoy
patent: 5748940 (1998-05-01), Johnston
patent: 5842006 (1998-11-01), Harvey et al.
Amdahl Gene M.
Caserza Steven F.
Wambach Margaret R.
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