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US Patent 6185523 - Apparatus and method for computer system interrupt emulation

US Patent Issued on February 6, 2001
Estimated Patent Expiration Date: Icon_subject October 5, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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Abstract

Accordingly, provided is an apparatus and method for generating a computer system interrupt emulation having the effect of a hardwired interrupt. A service processor with a test circuit interface can be coupled to an integrated circuit, which has a test circuit with an access to a register of the integrated circuit. A program, executable by the processor, responds to an interrupt request by instructing the processor to save a system state of the integrated circuit and to set a system state of the integrated circuit. The method for emulating an interrupt of an integrated circuit provides for receiving an interrupt request. A register of an integrated circuit is then accessed through a test circuit of the integrated circuit. The contents of the register are saved to a storage location, and the register is then set to a state responsive to the interrupt request. The interrupt request may be made locally or remotely.

Other References

  • M. Winters, Using IEEE-1149.1 for In-Circuit Emulation, WESCON/94, Idea/Microelectronics, Conference Record, 1994, pp. 525-528
  • D. Gonzales, Tool Reusable for DSP System Emulation and Board Production Testing, Northcon/96, 1996, pp. 306-311
  • Ing-Jer Huang and Tai-An Lu, Iceberg: An Embedded In-Circuit Emulator Synthesizer for Microcontrollers, Design Automation Conference, 1999, Proceedings, 36th, pp. 580-585
  • Texas Instruments, Inc., TI Addresses PCI Multi-Drop for IEEE 1149.1, web page. Copyright 1997, pp. 1-3
  • IBM, Inc., PowerEM Emulators, web page, Copyright 1998, pp. 1-5 - x3.htm

Inventors

Application

No. 166437 filed on 10/05/1998

US Classes:

703/28, In-circuit emulator (i.e., ICE)703/26Of instruction

Field of Search

703/28, In-circuit emulator (i.e., ICE)703/26, Of instruction712/227, Specialized instruction processing in support of testing, debugging, emulation714/30, Built-in hardware for diagnosing or testing within-system component (e.g., microprocessor test mode circuit, scan path)714/727Boundary scan

Examiners

Primary: Teska, Kevin J.
Assistant: Frejd, Russell W.

Attorney, Agent or Firm

US Patent References

5479652, Microprocessor with an external command mode for diagnosis and debugging
Issued on: 12/26/1995
Inventor: Dreyer, et al.
5884023, Method for testing an integrated circuit with user definable trace function
Issued on: 03/16/1999
Inventor: Swoboda, et al.
5983017, Virtual monitor debugging method and apparatus
Issued on: 11/09/1999
Inventor: Kemp, et al.
5983379, Test access port controller and a method of effecting communication using the same
Issued on: 11/09/1999
Inventor: Warren
6041406Parallel and serial debug port on a processor
Issued on: 03/21/2000
Inventor: Mann

International Class

G06F 009/455

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