System and method for simulation of computer systems combining hardware and software interaction

• US 5,838,948 A
• Filed: 12/01/1995
• Issued: 11/17/1998
• Est. Priority Date: 12/01/1995
• Status: Expired due to Term

• Current Assignee: Applied Microsystems Corporation
• Original Assignee: Eagle Design Automation, Inc. (Siemens AG)
• Inventors: Bunza, Geoffrey J.
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): Walker, Tyrone V.
• Application Number:
  US08/566,401
• Time in Patent Office: 1,082 Days
• Field of Search: 395/500, 395/561, 395/568, 395/920, 395/921, 364/578
• US Class Current: 703/27
• CPC Class Codes: G06F 11/261 by simulating additional hardware, e.g. fault simulation
• CPC Class Codes: G06F 30/33 Design verification, e.g. functional simulation or model checking
• CPC Class Codes: Y10S 706/92 Simulation

Abstract

A system for simulation of target electronic systems combining interacting elements of hardware and executing software, in part by physical emulation means and in part by abstract software simulation. A processor emulator is coupled to a hardware simulator by a communications link. The processor emulator provides the functionality of the target microprocessor while the hardware simulator simulates additional target circuitry. The processor emulator is coupled to a memory containing the target program. Most computer instructions in the target program do not require interaction with the target circuitry simulated on the hardware simulator. However, when a computer instructions requires the interaction of the target microprocessor and the target circuitry, a communications link control the communication between the target microprocessor and the target circuitry. The various components of the system can be coupled together via a conventional computer network. A translator/mapper translates the computer data requiring the interaction between the target microprocessor and the target circuitry from the data format of the emulator to the data format of the hardware simulator. The translated data is then mapped to a set of simulated pins on a processor model shell in the hardware simulator.

Claims

1. A system for testing and analyzing electronic systems, including a target microprocessor and simulated target circuitry, and accompanying target program to be executed on the target microprocessor, the system comprising:

a memory storing a plurality of computer instructions, said computer instructions including the target program;

a processor emulator employing a hardware device for emulating the target microprocessor, said processor emulator coupled to said memory to execute said computer instructions;

a hardware simulator coupled to said processor emulator to simulate the target circuitry; and

a communications interface to control communication between said processor emulator and said hardware simulator, said processor emulator communicating with said memory to receive said computer instructions from said memory, and said processor emulator communicating with said hardware simulator using said communications interface only when an event requires interaction of the target program with the target circuitry.

2. The system of claim 1 wherein said processor emulator is coupled to said hardware simulator by a computer network connection, said communications interface controlling communications over said network.

3. The system of claim 1, further including an exception detector coupled to said processor emulator to detect said event requiring the target program to interact with the target circuitry.

4. The system of claim 3 wherein said exception detector temporarily halts execution of said plurality of computer instructions while said hardware simulator processes said event requiring the target program to interact with the target circuitry.

5. The system of claim 1 wherein said event requiring the target program to interact with the target circuitry is an input/output (I/O) instruction to said hardware simulator, and said communication interface controls communication of said I/O instruction from said processor emulator to said hardware simulator.

6. The system of claim 1 wherein said processor emulator uses a first data format and said hardware simulator uses a second data format, the system further including a translator to convert said event requiring the target program to interact with the target circuitry from said first data format to one or more function calls in said second data format.

7. The system of claim 6 wherein said hardware simulator contains a processor model shell to simulate activity of the pins of the target microprocessor, the system further including a mapper to map said function calls from said second data format to a set of signal sequences compatible with the processor model shell.

8. The system of claim 7, further including a computer communicating with said processor emulator, said computer also executing said hardware simulator, said translator, and said mapper.

9. The system of claim 7 wherein said processor emulator is coupled to said translator and said mapper by a first computer network connection, said communications interface controlling communication over said first network connection.

10. The system of claim 9, wherein said translator and said mapper are coupled to said hardware simulator by a second computer network connection, said communications interface controlling communication between said processor emulator and said hardware simulator over said first and second network connections.

11. The system of claim 1 wherein said processor emulator is a microprocessor emulator with said memory integrated therein, said integrated memory containing said computer instructions.

12. The system of claim 1 wherein said processor emulator is a hardware circuit emulator with said memory integrated therein, said integrated memory containing said computer instructions.

13. The system of claim 1, further including a computer communicating with said processor emulator, said computer also executing said hardware simulator.

14. The system of claim 1 wherein said hardware simulator contains a processor model shell to simulate activity of the pins of the target microprocessor, the system further including a mapper to map said event requiring the target program to interact with the target circuitry to a set of signal sequences compatible with the processor model shell.

15. The system of claim 14, further including a computer communicating with said processor emulator, said computer also executing said hardware simulator and said mapper.

16. A system for testing and analyzing electronic systems, including first and second target microprocessors and simulated target circuitry, and accompanying target program to be executed on each of the target microprocessors, the system comprising:

a first memory storing a first set of computer instructions for the first target microprocessor, said first set of computer instructions including the target program for the first target microprocessor;

a first processor emulator employing a hardware device for emulating the first target microprocessor, said first processor emulator coupled to said first memory to execute said first set of computer instructions;

a second memory storing a second set of computer instructions for the second target microprocessor, said second set of computer instructions including the target program for the second target microprocessor;

a second processor emulator employing a hardware device for emulating the second target microprocessor, said second processor emulator coupled to said second memory to execute said second set of computer instructions;

a hardware simulator coupled to said first and second processor emulators to simulate the target circuitry; and

a communications interface to control communication between said first and second processor emulators and said hardware simulator, said first and second processor emulators communicating with said first and second memories, respectively, to receive said first and second sets of computer instructions from said first and second memories, said first processor emulator communicating with said hardware simulator using said communications interface only when an event requires interaction of the target program for the first target microprocessor with the target circuitry, and said second processor emulator communicating with said hardware simulator using said communications interface only when an event requires interaction of the target program for the second target microprocessor with the target circuitry.

17. The system of claim 16 wherein said communications controller has first and second portions, said first communications controller portion being operatively coupled to said first processor emulator to control communications between said first processor emulator and said hardware simulator only on said event when the target program for the first target microprocessor requires interaction with the target circuitry, said second communications controller portion being operatively coupled to said second processor emulator to control communications between said second processor emulator and said hardware simulator only on said event when the target program for the second target microprocessor requires interaction with the target circuitry.

18. The system of claim 16 wherein said first and second processor emulators are each coupled to said hardware simulator by a computer network connection, said communications interface controlling communications over said network connections.

19. The system of claim 16, further including first and second exception detectors coupled to said first and second processor emulators, respectively, said first exception detector detecting said event when the target program for the first target microprocessor requires interaction with the target circuitry, and said second exception detector detecting said event when the target program for the second target microprocessor requires interaction with the target circuitry.

20. The system of claim 19 wherein said first exception detector temporarily halts execution of said first set of computer instructions while said hardware simulator processes said event when the target program for the first target microprocessor requires interaction with the target circuitry, and said second exception detector temporarily halts execution of said second set of computer instructions while said hardware simulator processes said event when the target program for the second target microprocessor requires interaction with the target circuitry.

21. The system of claim 16 wherein said event when the target program for the first target microprocessor requires interaction with the target circuitry is an input/output (I/O) instruction to said hardware simulator, and said communication interface controls communication of said I/O instruction from said first processor emulator to said hardware simulator.

22. The system of claim 16 wherein said event when the target program for the second target microprocessor requires interaction with the target circuitry is an input/output (I/O) instruction to said hardware simulator, and said communication interface controls communication of said I/O instruction from said second processor emulator to said hardware simulator.

23. The system of claim 16 wherein said first and second processor emulators use a first data format and said hardware simulator uses a second data format, the system further including a translator to convert said events when the target program for the first and second target microprocessors require interaction with the target circuitry from said first data format to one or more function calls in said second data format.

24. The system of claim 23 wherein said hardware simulator contains first and second processor model shells to simulate activation of the pins of the first and second target microprocessors, respectively, the system further including a mapper to map said function calls for the first target microprocessor from said second data format to a set of signal lines compatible with said first processor model shell, and to map said function calls for the second target microprocessor from said second data format to a set of signal sequences compatible with said second processor model shell.

25. The system of claim 24, further including a computer communicating with said first and second processor emulators, said computer also executing said hardware simulator, said translator, and said mapper.

26. The system of claim 23 wherein said first and second processor emulators are coupled to said translator by a first computer network connection, said communications interface controlling communication over said first network connection.

27. The system of claim 26 wherein said translator is coupled to said hardware simulator by a second computer network connection, said communications interface controlling communication between said processor emulator and said hardware simulator over said first and second network connections.

28. The system of claim 16 wherein said first and second processor emulators are microprocessor emulators with said first and second memories, respectively, integrated therein, said first integrated memory storing said first set of computer instructions for the first target microprocessor, and said second integrated memory storing said second set of computer instructions for the second target microprocessor.

29. The system of claim 16 wherein said first and second processor emulators are hardware circuit emulators with said first and second memories, respectively, integrated therein, said first integrated memory storing said first set of computer instructions for the first target microprocessor, and said second integrated memory storing said second set of computer instructions for the second target microprocessor.

30. The system of claim 16, further including a computer communicating with said first and second processor emulators, said computer also executing said hardware simulator.

31. The system of claim 16 wherein said hardware simulator contains first and second processor model shells to simulate activity of the pins of the first and second target microprocessors, respectively, the system further including a mapper to map said event requiring the target program for the first target microprocessor to interact with the target circuitry to a set of signal sequences compatible with the first processor model shell, said mapper also mapping said event requiring the target program for the second target microprocessor to interact with the target circuitry to a set of signal sequences compatible with the second processor model shell.

32. The system of claim 31, further including a computer communicating with said processor emulator, said computer also executing said hardware simulator and said mapper.

33. A system for testing and analyzing a electronic systems, including a target microprocessor and a target program to be executed on the target microprocessor, and simulated target circuitry simulated on a hardware simulator, the system comprising:

a processor emulator employing a hardware device for emulating the target microprocessor, said processor emulator including a memory for storing and executing the target program;

a processor model shell substituting for a processor model in the hardware simulator;

said processor model shell simulating activity of the pins of the target microprocessor;

interaction detection means coupled to the processor emulator and said processor model shell, said interaction detection means recognizing, in cooperation with said processor emulator, when the target program needs to interact with the target circuitry in the hardware simulator; and

a communication link coupling said processor model shell to said interaction detection means and coupling said interaction detection means to said processor emulator, whereby the system simulates the functional behavior of the target microprocessor executing target programs acting in conjunction with simulated target circuitry.

34. The system of claim 33 wherein said interaction detection means includes a software kernel communicating with the processor emulator and said processor model shell to detect when the target program needs to interact with the target circuitry in the hardware simulator.

35. The system of claim 34 wherein said software kernel translates operational requests from the target program requiring interaction with the target circuitry in the hardware simulator and maps said operational requests into processor functions for communication to said processor model shell.

36. The system of claim 34 wherein said software kernel maps hardware generated requests from said processor model shell requiring interaction with the target program, said software kernel translating and communicating said hardware generated requests to the target program in said processor emulator.

37. The system of claims 34 for operation with external computers wherein said hardware simulator is executed by a first of the external computers and said software kernel is executed by a second of the external computers.

38. The system of claim 34 wherein said software kernel comprises a plurality of logical functions, said logical functions being distributed as control program elements in said processor emulator control software, and as part of said processor model shell operating in conjunction with the hardware simulator.

39. The system of claim 34, further including a computer communicating with said processor emulator, said computer also executing the hardware simulator, including said processor model shell, and said software kernel.

40. The system of claim 33 wherein said processor emulator includes hardware control circuitry and control software and said interaction detection means uses said control circuitry to selectively recognize when the target program needs to interact with the target circuitry in the hardware simulator, said control circuitry interrupting execution of the target program when the target program needs to interact with the target circuitry in the hardware simulator and otherwise allowing uninterrupted execution of the target program.

41. The system of claim 33 wherein said processor emulator includes control circuitry and control software and said interaction detection means uses said control software to selectively recognize when the target program needs to interact with the target circuitry in the hardware simulator, said control software interrupting execution of the target program when the target program needs to interact with the target circuitry in the hardware simulator and otherwise allowing uninterrupted execution of the target program.

42. The system of claim 33 wherein the hardware simulator and said processor model shell are executed on a computer workstation and said communication link controls communication between said emulator and said workstation.

43. The system of claim 33 wherein said processor emulator is a microprocessor emulator with memory integrated therein, said integrated memory containing the target program, said microprocessor emulator communicating with said interaction detection means acting in conjunction with the simulated target circuitry.

44. The system of claim 33 wherein said processor emulator is a hardware circuit emulator with memory integrated therein, said integrated memory containing the target program, said hardware emulator communicating with said interaction detection means acting in conjunction with the simulated target circuitry.

45. The system of claim 33 wherein said communication link supports TCPIP socket protocols.

46. The system of claim 33 wherein said communication link coupling said processor model shell to said software kernel and coupling said software kernel to said processor emulator are software program calls.

47. The system of claim 33 wherein said processor emulator means is a microprocessor emulator with integrated memory contained therein, the system further including external memory coupled to said microprocessor emulator through a microprocessor bus connection with the target program contained in a program memory comprising at least one of said integrated and external memories.

48. The system of claim 47 wherein the target program is contained in both said integrated and external memories.

49. The system of claim 33, further including an additional processor emulator employing a hardware device for emulating an additional target microprocessor, said additional processor emulator including an additional memory for storing and executing a target program to be executed on said additional target microprocessor wherein said software kernel recognizes, in cooperation with said additional processor emulator, when said target program to be executed on said additional target microprocessor needs to interact with the target circuitry in the hardware simulator.

50. A system for testing and analyzing a computer system, including a processor emulator employing a hardware device for emulating a target microprocessor, said processor emulator including a memory for storing and executing a target program to be executed on the target microprocessor, and simulated target circuitry simulated on a hardware simulator, the system comprising:

a software kernel communicating with the processor emulator and the hardware simulator, said software kernel recognizing, in cooperation with the processor emulator, when the target program needs to interact with the target circuitry in the hardware simulator; and

a communication link coupling the hardware simulator to said software kernel and coupling said software kernel to the processor emulator, whereby the system simulates the functional behavior of the target microprocessor executing target programs acting in conjunction with simulated target circuitry.

51. A system for testing and analyzing a computer system, including a processor emulator employing a hardware device for emulating a target microprocessor, said processor emulator including a memory for storing and executing a target program to be executed on the target microprocessor, and simulated target circuitry simulated on a hardware simulator, the system comprising:

a software kernel communicating with the processor emulator and the hardware simulator, said software kernel recognizing, in cooperation with the processor emulator, when the executing target program needs to interact with the target circuitry in the hardware simulator, said target program and said hardware simulator otherwise executing in parallel; and

a communication link coupling the hardware simulator to said software kernel and coupling said software kernel to the processor emulator, whereby the system simulates the functional behavior of the target microprocessor executing target program acting in conjunction with simulated target circuitry.

52. The method of claim 51, further including the step of detecting said event when the target microprocessor needs to interact with the target circuitry using an exception detection software routine.

53. The method of claim 51 wherein said event when the target microprocessor needs to interact with the target circuitry is an input/output (I/O) instruction to said hardware simulator, and said set of controlling communication, controls communication of said I/O instruction from said processor emulator to said hardware simulator.

54. The method of claim 51 wherein said processor emulator uses a first data format and said hardware simulator uses a second data format, the method further including the step of converting said event when the target microprocessor needs to interact with the target circuitry from said first data format to one or more functions in said second data format.

55. The method of claim 54 wherein said hardware simulator contains a processor model shell to simulate activity of the pins of the target microprocessor, the method further including the step of mapping said functions in said second data format to a set of signal sequences compatible with the processor model shell.

56. The method of claim 55 for use with a computer communicating with said processor emulator, wherein said computer also performs said steps of simulating the target circuitry using said hardware simulator, converting said event, and mapping.

57. The method of claim 55 wherein said processor emulator is coupled to said translator and said mapper by a first computer network connection and said step of controlling communications controls communications over said first network connection.

58. The method of claim 56 wherein said translator and said mapper are coupled to said hardware simulator by a second computer network and said step of controlling communications controls communications over said second network connection.

59. The method of claim 51 for use with a computer communicating with said processor emulator, wherein said computer also performs said step of simulating the target circuitry using said hardware simulator.

60. The method of claim 51 wherein said hardware simulator contains a processor model shell to simulate activity of the pins of the target microprocessor, the method further including the step of mapping said event requiring the target program to interact with the target circuitry to a set of signal sequences compatible with the processor model shell.

61. The method of claim 60 for use with a computer communicating with said processor emulator, wherein said computer also performs said step of simulating the target circuitry using said hardware simulator and said step of mapping.

62. The method of claim 51 for use with an additional processor emulator employing a hardware device for emulating an additional target microprocessor, the additional processor emulator including an additional memory for storing and executing a target program to be executed on the additional target microprocessor, the method further including the steps of controlling communication between the additional memory, the additional processor emulator and said hardware simulator, the additional processor emulator communicating with the additional memory to receive computer instructions, including the target program to be executed on the additional target microprocessor, from the additional memory, and the additional processor emulator communicating with said hardware simulator only on an event when the additional target microprocessor needs to interact with the target circuitry.