Methods and apparatus for generating pseudo-random binary patterns
First Claim
1. Apparatus for generating a pseudo-random binary pattern having a variable characteristic polynomial, said pseudo-random binary pattern formed as a plurality of serial bit streams, corresponding bits in each said stream forming together one of successive w-bits words in said binary pattern, comprising:
- a plurality of LFSR sequence generators, each said LFSR sequence generator arranged to generate bits for one of said serial bit streams and including a plurality of stages, said stages having an input stage, at least one intermediate stage, and an output stage, said stages being coupled for sequential propagation of signals through said stages, and at least one of said stages in each LFSR generator being responsive to a respective control signal for that stage to determine whether signal propagation through said stage is influenced by a feedback signal for that LFSR generator; and
means for producing in accordance with said variable characteristic polynomial a portion of predetermined length of one of said serial bit streams, and deriving said control signal from said portion.
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Abstract
Method and apparatus for generating a pseudo-random binary pattern having a variable characteristic polynomial. The pseudo-random binary pattern is formed as a plurality of serial bit streams, with corresponding bits in each stream forming together one of successive w-bit words in the binary pattern. A plurality of linear feedback shift register (LFSR) sequence generators are each arranged to generate bits for respective ones of the serial bit streams. Each LFSR generator includes a plurality of stages, the stages having an input stage, at least one intermediate stage, and an output stage, the stages being coupled for sequential propagation of signals through the stages. At least one of the stages in each LFSR generator is responsive to a respective control signal for that stage to determine whether signal propagation through that stage is influenced by a feedback signal for that LFSR generator. A portion of predetermined length of one of the serial bit streams is produced in accordance with the variable characteristic polynomial. The control signal is derived from that portion.
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Citations
16 Claims
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1. Apparatus for generating a pseudo-random binary pattern having a variable characteristic polynomial, said pseudo-random binary pattern formed as a plurality of serial bit streams, corresponding bits in each said stream forming together one of successive w-bits words in said binary pattern, comprising:
a plurality of LFSR sequence generators, each said LFSR sequence generator arranged to generate bits for one of said serial bit streams and including a plurality of stages, said stages having an input stage, at least one intermediate stage, and an output stage, said stages being coupled for sequential propagation of signals through said stages, and at least one of said stages in each LFSR generator being responsive to a respective control signal for that stage to determine whether signal propagation through said stage is influenced by a feedback signal for that LFSR generator; and
means for producing in accordance with said variable characteristic polynomial a portion of predetermined length of one of said serial bit streams, and deriving said control signal from said portion.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for generating a pseudo-random binary pattern having a variable characteristic polynomial, said pseudo-random binary pattern formed as a plurality of serial bit streams, corresponding bits in each said stream forming together one of successive w-bit words in said binary pattern, comprising:
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arranging a plurality of LFSR generators, such that each of said LFSR generators generates bits for one of said serial bit streams and each of said LFSR generators has an input stage, at least one intermediate stage and an output stage, said stages being coupled for sequential propagation of signals through said stages, and at least one of said stages in each LFSR generator being responsive to a respective control signal for that stage to determine whether signal propagation through that stage is influenced by a feedback signal for that LFSR generator; producing in accordance with said variable characteristic polynomial a portion of predetermined length of one of said serial bit streams; and deriving said control signal from said portion. - View Dependent Claims (14, 15, 16)
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Specification