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Bus monitor with means for selectively capturing trigger conditions
| Details |
Inventors: De Angelis, Douglas J.; Maddox, Henry W. J.; Peters, Arthur; Rathbun, Donald J.; Saltmarsh, William L.;
Assignee: Bull HN Information Systems Inc. (Billerica, MA)
Primary Examiner: Beausoliel, Jr.; Robert W.
Assistant Examiner: Chung; Phung M.
Attorney, Agent or Firm: Clapp; Gary D., Solakian; John S.
A monitoring means for selectively detecting and recording signals representing at selected points within a system, includes trigger generation logic responsive to selected bus signals for generating trigger signals representing the occurrence of selected conditions, and a recording memory for recording the conditions thereupon, a trigger selection logic for selecting trigger outputs corresponding to the trigger signals. The trigger selection logic includes a trigger enabling memory for storing selectable trigger enabling codes, wherein each enabling code corresponds to a trigger signal, and trigger output logic responsive to the trigger enabling codes and to the trigger signals for providing trigger outputs. The trigger enabling codes include bus enabling codes representing selected conditions on a bus of the system, trigger sequence enabling codes corresponding to sequential combinations of trigger signals and external trigger enabling codes corresponding to triggers external to the system. The enabling codes may select trigger signals to be used in logical AND or OR functions in generating a trigger output or in substitution for a bus trigger signal. |
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DETAILED DESCRIPTION The present invention provides a monitoring means for selectively detecting and recording conditions at selected points within a system during operation, including a trigger generation means connected from first selected points and responsive to selected conditions thereupon for generating trigger signals representing the occurrence of corresponding selected conditions and a recording memory means connected from second selected points and responsive to trigger outputs for recording the conditions present at the second selected points.
In particular, the present invention provides a means for selecting the trigger outputs corresponding to the trigger signals, comprising a trigger enabling memory for storing a plurality of selectable trigger enabling codes, wherein each enabling code corresponds to a trigger signal representing the occurrence of a corresponding condition to be detected.
The trigger output means is responsive to the trigger enabling codes and to the trigger signals for providing trigger outputs upon the occurrence of a trigger signal corresponding to a selected trigger enabling code.
The first selected points may include the lines of a first bus of the system, signals indicating the presence of an illegal condition on a bus of the system, and signals from points external to the buses of the system.
The second selected points may include the lines of the first bus of the system, the lines of a second bus of the system, and a set of points external to the first and second buses of the system.
The trigger enabling codes include a plurality of bus enabling codes, wherein each of the bus enabling codes corresponds to one of a plurality of bus trigger signals, and each of the bus trigger signals represents a selected condition on a bus of the system.
One of the bus trigger signals occurs upon each cycle of operation of the bus and a corresponding bus enabling code enables a trigger output upon each bus cycle.
The trigger enabling codes may also include a plurality of trigger sequence enabling codes, wherein each of the trigger sequence enabling codes corresponds to a sequential combination of a first trigger signal and a second trigger signal, wherein a trigger sequence enabling code will enable a trigger output upon the condition that the first trigger signal occurs before the second trigger signal
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TV Signal 
