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Algorithmically programmable memory tester with test sites operating in a slave mode

  • US 6,779,140 B2
  • Filed: 06/29/2001
  • Issued: 08/17/2004
  • Est. Priority Date: 06/29/2001
  • Status: Active Grant
First Claim
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1. A method of producing in concurrently executing separate programs synchronized responses in those separate programs to an event signal having different propagation delays from its origin to each of respective environments within which each separate program executes, the method comprising the steps of:

  • (a) executing each separate program on a respectively separate processor, each of which is located within an associated respective electrical environment;

    (b) operating corresponding separate counters within the electrical environment for each processor, one value among the counts of which serves as an index signal for the respective electrical environments containing the counters, the counters each operating at the same clock frequency and each having previously been started in unison with a common starting count subsequent to a preceding occurrence of the index signal associated with each counter;

    (c) serially propagating an event signal from the electrical environment of one separate processor to another in accordance with an ordering among the separate processors, the serial propagation being in a first direction along the ordering;

    (d) in response to the event signal reaching a most distal electrical environment along the ordering in the first direction, generating therein a response signal subsequent to an instance of the index signal for that most distal electrical environment;

    (e) serially propagating the response signal, from its origin in the most distal electrical environment along the ordering in the first direction, to each of the other electrical environments, this instance of serial propagation being in a direction along the ordering opposite to that of the first direction of step (c); and

    (f) within each electrical environment, responding to the response signal upon the next instance of the index signal from the counter within that electrical environment.

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