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Method and apparatus for a trace buffer in an emulation system

  • US 5,884,066 A
  • Filed: 05/14/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 02/16/1994
  • Status: Expired due to Term
First Claim
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1. A tracing system for tracing the operation of a digital circuit, the tracing system comprising:

  • a digital system for emulating the operation of the digital circuit, the digital system including a clock, inputs, internal signals and one or more state storage means for storing and indicating an electrical state;

    implementation means coupled to the digital system for representing the logic of the digital circuit within the digital system;

    input tracing means coupled to the digital system for sensing and storing the states of the inputs every clock cycle;

    internal state tracing means coupled to the storage means in the digital system, for sensing and storing a state of a state storage means of the digital system every n clock cycles;

    analysis means coupled to the digital system for deriving the state of one or more internal signals based on the stored internal states and the stored input states; and

    output means coupled to the digital system for outputing the derived states of the internal signals.

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