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Method for Diagnosing Sequencer Behavior in Complex Integrated Circuits

IP.com Disclosure Number: IPCOM000037252D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29

Publishing Venue

IBM

Related People

Authors:
Marks, LV McNeil, WL [+details]

Abstract

Integrated circuits have become increasingly dense; the number of circuit I/O pins has not increased accordingly. This has increased the difficulty of 'debugging' new designs. One of the most difficult problems is tracing what internal states an internal finite-state- machine (also called sequencer or counter) has traversed. A technique is described for tracing hardware states by writing them to successive RAM locations. Writes may be triggered at regular intervals or whenever state-changes occur. Timing information may be stored with the data.