The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 2004
Filed:
Apr. 30, 1999
Patrick E. Perry, Shelburne, VT (US);
Sebastian T. Ventrone, South Burlington, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for determining the operational state of a logic device having a plurality of shadow registers, each associated with one of a plurality of functional registers. Data stored in a functional register is, under selected conditions, also stored in an associated shadow register. These conditions include without limitation receipt by the functional register of predetermined event information such as an opcode, memory address or other information. Data in a given set of functional registers, e.g., registers making up pipeline stages in a microprocessor, may be stored in shadow registers simultaneously or sequentially when given data reaches a given register in the set. Additionally, data is stored in the shadow registers without interrupting execution cycles of the logic device.