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:
Oct. 27, 2009
Filed:
Mar. 20, 2007
Neil G. Jacobson, Los Altos, CA (US);
Neil G. Jacobson, Los Altos, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
Methods and systems are provided for determining a total length of instruction registers. A data shift of a scan chain determines whether each device in the scan chain is an identified device. An overall length of the instruction registers of the devices is determined from an instruction shift. An actual position is determined for an identified device between each pair of sub-sequences of unidentified devices. An instruction shift of the scan chain attempts to set the respective instruction register of the identified device using one or more trial positions. If a data shift of the scan chain obtains the recognized value of the respective identification register of the identified device for one of the trial positions, then this trial position is the actual position within the overall length. The total length is determined for the instruction registers of the unidentified devices in each sub-sequence of the unidentified devices.