Claims
- 1. Apparatus for selecting, storing and displaying a set of states occurring in a collection of digital signals, the apparatus comprising:
- input means coupled to receive the collection of digital signals for performing signal conditioning thereon according to preselected thresholds to produce a collection of conditioned signals;
- trace specification means for specifying state conditions in the collection of digital signals according to which the set of states to be stored and displayed is selected from among the states occurring in the collection of digital signals;
- recognition means coupled to the collection of conditioned signals and responsive to the trace specification means for producing control signals indicative of whether or not a state is to be stored;
- timer means for producing a collection of digital time signals indicative of the passage of time;
- storage means coupled to the collections of conditioned signals and digital time signals and to the control signals for storing the set of states selected by the trace specification means and also for storing a time associated with each such selected state;
- display means coupled to the storage means for displaying the set of stored states in correlated relation with their associated times.
- 2. Apparatus as in claim 1 wherein the displayed times represent values on a single absolute time scale having its origin not later than the first state selected for storage in the storage means.
- 3. Apparatus as in claim 1 wherein the displayed times represent the elapsed time intervals between the storage of each stored state and the storage of its predecessor.
- 4. Apparatus for selecting, storing and displaying a set of states occurring in a collection of digital signals, the apparatus comprising:
- input means coupled to receive the collection of digital signals for performing signal conditioning thereon according to preselected thresholds to produce a collection of conditioned signals;
- trace specification means for specifying state conditions in the collection of digital signals according to which the set of states to be stored and displayed is selected from among the states occurring in the collection of digital signals;
- recognition means coupled to the collection of conditioned signals and responsive to the trace specification means for producing control signals indicative of whether or not a state is to be stored;
- count qualification means coupled to the collection of conditioned signals for recognizing a selected state occurring in the collection of digital signals and for producing a qualified count signal upon each such recognition;
- counter means coupled to the qualified count signal for producing a collection of digital count signals indicative of the number of times the selected state has occurred;
- storage means coupled to the collections of conditioned signals and digital count signals and to the control signals for storing the set of states selected by the trace specification means and also for storing the count associated with each such selected state;
- display means coupled to the storage means for displaying the set of stored states in correlated relation with their associated count.
- 5. Apparatus as in claim 4 wherein the displayed counts represent values on a single monotonically increasing scale having its origin not later than the first state selected for storage in the storage means.
- 6. Apparatus as in claim 4 wherein the displayed counts represent the various number of occurrences of the selected state inbetween the storage of each stored state and the storage of its predecessor.
REFERENCE TO RELATED APPLICATIONS
This application is a division of an earlier filed copending application Ser. No. 210,462, filed on Nov. 25 1980 by George H. Haag, et al., and amended to be entitled LOGIC STATE ANALYZER WITH STORAGE QUALIFICATION, now U.S. Pat. No. 4,373,193. That application was a continuation of application Ser. No. 75,787 entitled LOGIC STATE ANALYZER filed Sept. 17 1979 by the same inventors, and which is now abandoned. That application was in turn a division of a now abandoned application of the same inventors and title, Ser. No. 828,138, filed on Aug. 29 1977.
The subject matter of the present application is related to the subject disclosed in U.S. Pat. No. 4,040,025, issued to Justin S. Morrill, Jr., on Aug. 2 1977, and which was filed on Mar. 31 1976.
The subject matter of the present application is also related to the subject disclosed in U.S. Pat. No. 4,100,532, issued to William A. Farnbach on July 11 1978, and which was filed on Nov. 19 1976.
U.S. Pat. Nos. 4,040,025 and 4,100,532 to Morrill, et al. and Farnbach, respectively, are hereby expressly incorporated by reference.
US Referenced Citations (6)
Non-Patent Literature Citations (3)
Entry |
Operating and Service Manual Supplement--1611A, OPT A68--6800 Microprocessors--Hewlett Packard--HP A68--11611A--Part No. 10257-90907, May 1981. |
Operating and Service Manual Supplement--1611A, OPT A60--6800 Microprocessors--Hewlett Packard--Part No. 10258-90905, 8/80. |
Service Manual--Logic State Analyzer--1611A--Hewlett Packard--Part No. 01611-90909, Jul. 1980. |
Divisions (2)
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Number |
Date |
Country |
Parent |
210462 |
Nov 1980 |
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Parent |
828138 |
Aug 1977 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
75787 |
Sep 1979 |
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