A linear feedback shift register as set forth in claim 3 in which said combining means comprise a first feedback path including at least one exclusive-OR gate having an input coupled to an output of a respective bistable stage and a second feedback path including at least one exclusive-OR gate having an input coupled to an output of a respective bistable stage, and said multiplexer means includes means for enabling selectively one or other of said feedback paths and a respective one of two forward transmission paths along said bistable stages in opposite directions.ħ. A linear feedback shift register as set forth in claim 3 wherein said combining means each comprise an exclusive-OR gate for combining an output of a respective stage with a feedback signal and for coupling a sum output to a stage other than said respective stage.Ħ. A shift register as set forth in claim 3 wherein said multiplexer means are integral with the bistables stages.ĥ. A linear feedback shift register as set forth in claim 2 wherein the first and second means each provide a respective input to at least one of the bistable stages and the multiplexer means comprise means for selecting for said at least two stages the respective input to complete the first configuration or the second configuration respectively.Ĥ. Said first and second means including multiplexer means for selecting said first and second connections.ģ.
Second means for providing a second connection of the stages and at least a second feedback combining means in a second linear feedback shift register configuration, said second configuration being operable to generate a second pseudo-random state sequence which is the reverse of the first pseudo-random state sequence and A linear feedback shift register comprising:įirst means for providing a first connection of the stages and at least a first feedback combining means in a first linear feedback shift register configuration, such configuration being operable to generate a first pseudo-random state sequence Means, coupled to the said means for providing, for selecting one of said sequences.Ģ. Means for providing two selectable feedback configurations each including the bistable stages and each providing one of a pair of forward and reverse pseudo-random state sequences and A linear feedback shift register comprising:
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