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:
Jun. 05, 2001
Filed:
Aug. 17, 1998
Shaun Patrick Whalen, Wescosville, PA (US);
Lucent Technologies, Inc., Murray Hill, NJ (US);
Abstract
The present invention is embodied in a method and apparatus for generating a complete discontinuity trace of instruction execution by a digital processor utilizing a serial interface, such as a JTAG, that provides “trace until” capability by utilizing circular buffering of an on-chip discontinuity trace. The serial bit stream is observed as it is clocked out of the processor pins and trace codes are extracted and written to a local memory. Codes that have a complete address are arranged into a linked list, and the link information is used to maintain a circular buffer when the buffer fills up and the oldest data is overwritten with new data.