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. 10, 2004
Filed:
Jan. 25, 2001
Stephen K. Sunter, Nepean, CA;
LogicVision, Inc., San Jose, CA (US);
Abstract
A method for sequentially accessing circuit nodes in an IEEE 1149.4 compatible mixed-signal circuit having a test access port controller, a boundary scan register having a boundary module associated with each circuit node, analog busses for accessing the circuit nodes and connecting the analog bus pins and each boundary module, the boundary modules having analog switches for selectively accessing the busses, shift register elements and associated update latches for controlling the analog switches, the method comprising initializing the boundary modules with logic values including an analog switch enabling logic value for enabling a switch associated with a first of the circuit nodes and enabling the switch; monitoring or driving the first signal node via the analog busses; suppressing capture mode in each boundary module; and for each additional circuit node to be accessed, shifting the switch enabling logic value from the boundary module containing the logic value to the boundary module associated with the next signal node to be accessed, enabling a switch associated therewith; and monitoring or driving the next signal node via the analog bus.