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:
Feb. 06, 2001
Filed:
Mar. 30, 1998
Carl Frederick Barnhart, Round Rock, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A circuit is disclosed that includes a latch circuit and boundary scan cell circuitry. The latch circuit includes a slave latch and a master latch having a data output. The slave latch includes at least a first data input connected to the data output of the master latch, a second data input, and a control input that receives a control signal that controls latching of data present at the second data input. The boundary scan cell circuitry is connected to the second data input and to the control input of the slave latch so that the boundary scan cell circuitry can supply the control signal and data to the slave latch. In one embodiment, the boundary scan cell circuitry is IEEE1149.1-compliant and the circuit further includes either an output driver coupled to the data output of the slave latch or an input receiver coupled to a data input of the master latch.