主权项 |
1. A device comprising:
A. a base substrate having functional input outputs, functional output inputs, a test data in output, a test mode select output, a test clock output, and a test data out input; B. an integrated circuit die having functional inputs and functional outputs, and having no connection to any of the test data in output, the test mode select output, the test clock output, and the test data out input; and C. an interposer, including:
i. first functional input pads coupled to the functional input outputs of the base substrate;ii. first functional output pads coupled to the functional output inputs of the base substrate;iii. second functional input pads coupled to the functional inputs of the integrated circuit die;iv. second functional output pads coupled to the functional outputs of the integrated circuit die;v. a test access port controller coupled to the test clock output and the test mode select output, and having a control output bus; andvi. boundary register circuitry including boundary scan cells connected in series and coupled between the test data in output and the test data out input, and having a control input connected to the control output bus of the test access port controller, and the boundary register circuitry selectively coupling the first functional input pads to the second functional input pads and selectively coupling the second functional output pads to the first functional output pads. |