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US 5,291,457 AGranted
Sequentially accessible non-volatile circuit for storing data
AssigneeVLSI Technology, Inc.
InventorsCreigton S. Asato, Christoph Ditzen, James A. Rowson
Life of this patent
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Abstract
A sequentially accessible, non-volatile data storage circuit for generating constants includes a logic array for non-volatile storage of programmed data words and a recirculating shift register for causing the first one of the data words to appear at a data output of the data storage circuit in response to a reset signal and to cause the next data word to appear at the data output in response to a clock signal.
Claims14
A sequentially accessible, non-volatile data storage circuit comprising:
- logic array means for non-volatile storage of a plurality of predetermined programmed data words at least some of which are non-zero and at least some of which are different from one another;
- and
- recirculating shift means interconnected with said logic array means for causing a first one of the data words in a predetermined order of the data words to appear at a data output of the data storage circuit in response to a reset signal and to cause a next one of the data words to appear at the data output in response to a clock signal.
An apparatus for storing M predetermined N-bit data words, comprising:
- M.times.N flip-flops, every M flip-flop being connected together in series such that a data output of each of the M flip-flops is connected to a data input of exactly one other of the M flip-flops, each of the flip-flops being connected to a reset signal and being constructed to be set or reset when the reset signal is asserted according to bit values of the predetermined data words, at least some of which are non-zero and at least some of which are different from one another, each of the flip-flops also being connected to a clock signal so as to cause the data output of each of the flip-flops to assume the same logic value as the data input of each of the flip-flops when the clock signal is asserted, a data output of the apparatus being taken at the outputs of the N flip-flops that are set or reset according to the bit values of a first data word.
Dependencies are inferred from the claim text.