Patent
1995-06-02
1998-10-20
Harvey, Jack B.
39518313, G06F 9455, G06F 300
Patent
active
058260587
ABSTRACT:
A method and apparatus for providing an external indication of internal cycles in a data processing system (10) in order to more easily debug software being executed by data processing system (10). In one embodiment, data processing system (10) provides cycle type signals (14) external to data processing system (10). The cycle type signals (14) can be used to determine a variety of information about the activity and bus cycles being performed within data processing system (10), activity which is not readily discernible except by way of the cycle type signals (14). In some cases the information provided by the cycle type signals (14) is sufficient for debug purposes; in other cases, information from additional signals, e.g. the address type signals (15) and the read/write signal (19) may also be required.
REFERENCES:
patent: 4674089 (1987-06-01), Ponet et al.
patent: 5053947 (1991-10-01), Allison et al.
patent: 5313583 (1994-05-01), Yokota et al.
patent: 5361348 (1994-11-01), Nakamoto
patent: 5488688 (1996-01-01), Gonzales et al.
patent: 5493723 (1996-02-01), Beck et al.
patent: 5560036 (1996-09-01), Yoshida
Motorola, Inc., M68HC16 Family, "CPU16 Central Processor Unit Reference Manual," 1993, pp. 6-147.
Motorola, Inc., Modular Microcontroller Family, "SIM-System Intergration Module Reference Manual," 1992, pp. 4-13; 5-34 to 5-35; 5-58; 5-59; A-14.
Motorola, Inc., Modular Microcontroller Family, "SCIM-Single-Chip Intergration Module Reference Module," 1993, pp. 4-16; 5-35; 5-43; 5-61; 5-62, 7-19 to 7-20; A-16 to A-17.
Motorola, Inc., MC8HC16 Family, "MC68HC161Y1 User's Manual," 1993, pp. 4-33 to 4-34; 4-36; 4-42; 4-72.
Motorola, Inc., MC68H16 Family, "MC68HC16Z1 User's Manual," 1992, pp. 4-46; 4-50; 4-59; 4-60.
Motorola, Inc., M68300 Family, "MC68332 User's Manual," 1993, pp. 4-32 to 4-33; 4-36; 4-43.
Motorola, Inc., M68300 Family, "CPU32 Central Processor Unit Reference Manual," 1990, pp. 4-90.
Hartvigsen Jay A.
Harwood, III Wallace B.
Le Chinh H.
Harvey Jack B.
Hill Susan C.
Motorola Inc.
Wiley David A.
LandOfFree
Method and apparatus for providing an external indication of int does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for providing an external indication of int, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for providing an external indication of int will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-257082