Patent ID: 7661049
Filing Date: 2010-02-09
Classification: G01R,G06F

Abstract:
1. An integrated circuit, comprising: A. functional circuitry for performing a functional operation; B. functional input pads coupled to the functional circuitry; C. functional output pads coupled to the functional circuitry; D. a first test access port coupled to the functional circuitry and having first leads for TDI input, TCK input, TMS input, TRST input, and TDO output signals, the first test access port including a controller, an instruction register, and a data register coupled to the first leads; E. a test access port interface having second leads for TDI input, TCK input, TMS input, TRST input, and TDO output signals; and having third leads for TDI output, TCK output, TMS output, TRST output, and TDO input signals; and F. linking module circuitry having fourth leads for TDI input, TCK input, TMS input, TRST input, and TDO output signals, the linking module circuitry including a controller, an instruction register, and multiplexer circuitry for selectively coupling the signals on the fourth leads with the first leads and the second leads.