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:
Sep. 16, 2008
Filed:
Dec. 15, 2003
Otto Steinbusch, Cupertino, CA (US);
Otto Steinbusch, Cupertino, CA (US);
NXP B.V., Eindhoven, NL;
Abstract
Multiple test access port (TAP) controllers on a single chip are accessed, while maintaining the appearance to an outside observer of having only a single test access port controller. By adding a single bit to a data register () of each of a plurality of TAP controllers (), along with straightforward combinational logic, the plurality of TAP controllers can be accessed without the need for additional chip pins, and without the need for additional TAP controllers. Toggling the state of the added bits in the respective data registers of the plurality of TAP controllers provides the control information for either selecting one TAP controller or daisy-chaining of the plurality of TAP controllers.