The disclosure describes novel methods and apparatuses for controlling a device's TCA circuit when the device exists in a JTAG daisy-chain arrangement with other devices. The methods and apparatuses allow the TCA test pattern set used during device manufacturing to be reused when the device is placed...http://www.google.fr/patents/US8108742?utm_source=gb-gplus-shareBrevet US8108742 - Tap control of TCA scan clock and scan enable
