Patent ID: 7770084

Claim:
A process of loading and updating a JTAG instruction into a plurality of selectable devices connected to a JTAG controller by a two wire bus comprising: A. addressing a first device by inputting the first device's address on the two wire bus; B. performing a JTAG instruction scan to load an instruction into the first device using the two wire bus; C. ending the JTAG instruction scan in the Pause-IR state; D. repeating the addressing, performing, and ending steps to load instructions into subsequent devices; E. addressing the last device by inputting the last device's address on the two wire bus; F. performing a JTAG instruction scan to load an instruction into the last device using the two wire bus; G. ending the JTAG instruction scan in the Pause-IR state; H. addressing all devices by inputting a group address on the two wire bus; and I. transitioning all devices from the Pause-IR state to the Update-IR state to update the loaded instructions.