Patent Document ID: 4758906
Application ID: 06933704
Patent Status: 1

Claim One:
1. Block pattern detection circuitry comprising: a pattern detector for providing a pattern detection signal characterizing a received stream of parallel channels of data at the time of a data strobe, said pattern detector including means for receiving a stream of parallel channels of data and for receiving a data strobe, said pattern detection signal nominally discriminating between data pattern types including at least a first pattern type and a second pattern type; a thresholding means for providing qualified and unqualified pattern determination signals in response to thresholds attained as predetermined statistical functions over time of a received pattern detection signal, said thresholding means including input means for receiving pattern detection signals provided by said pattern detector, said thresholding means including means for receiving a qualifying input, said thresholding means being arranged so that said unqualified pattern determination signal undergoes a transition each time an attained threshold indicates a change in pattern has been determined, said thresholding means being arranged so that said qualified pattern determination undergoes a transition for thresholds attained except when an active qualifying input is received; and a state machine for providing a qualifying input to said thresholding means, said state machine being arranged to receive plural control input signals including a signal which is derived according to a predetermined function from said unqualified pattern determination signals from said thresholding means, said state machine being designed to progress through a network of states as a function of previous state and received control signals, said qualifying signal being a function of the state of said state machine so that the response of said qualified pattern determination signal to thresholds attained by said thresholding means can be qualified as a function of the state of said state machine.