Inverted TCK access port selector selecting one of plural TAPs

Details Inverted TCK access port selector selecting one of plural TAPs Inverted TCK access port selector selecting one of plural TAPs

2010-09-13

2011-11-22

Britt, Cynthia (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C714S734000

Reexamination Certificate

active

08065578

ABSTRACT:
The disclosure describes a novel method and apparatuses for allowing a controller to select and access different types of access ports in a device. The selecting and accessing of the access ports is achieved using only the dedicated TDI, TMS, TCK, and TDO signal terminals of the device. The selecting and accessing of device access ports can be achieved when a single device is connected to the controller, when multiple devices are placed in a daisy-chain arrangement and connected to the controller, or when multiple devices are placed in a addressable parallel arrangement and connected to the controller. Additional embodiments are also provided and described in the disclosure.

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“IEEE Standard for Reduced-Pin and Enhanced-Functionality Test Access Port and Boundary-Scan Architecture,” IEEE Std 1149.7-2009 , vol., No., pp. c1-985, Feb. 10, 2010 3doi: 10.1109/IEEESTD.2010.5412866 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5412866&isnumber=5412865.

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