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Emulation system with peripherals recording emulation frame when stop generated

  • US 7,392,431 B2
  • Filed: 02/22/2005
  • Issued: 06/24/2008
  • Est. Priority Date: 02/19/1999
  • Status: Expired due to Term
First Claim
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1. A method of in circuit emulation of an integrated circuit including a digital data processor capable of executing program instructions, comprising the steps of:

  • detecting a first debug event during normal program execution;

    upon detection of the first debug event suspending normal program execution while permitting at least one type interrupt service routine executed in response to a corresponding interrupt;

    incrementing a debug frame counter upon each of the at least one type interrupt received while suspending normal program execution;

    decrementing the debug frame counter upon each return from interrupt received while suspending normal program execution;

    detecting at least one second debug event during an interrupt service routine executing while suspending normal program execution;

    upon detection of the second debug event suspending program execution of the interrupt service routine while permitting execution of other interrupt service routines in response to corresponding interrupts; and

    storing the count of said debug frame counter upon each second debug event.

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