Patent ID: 8159244

Claim:
A method for testing a semiconductor package unit, comprising: electrically coupling a top printed circuit board to connectors on a top side of the semiconductor package unit, which has connectors on its bottom surface; supplying a first test signal to the semiconductor package unit at a connector on its bottom surface to perform a functional test that generates, in the semiconductor package unit, a second test signal different from the first test signal; transmitting the second test signal from an output pad on the top side of the semiconductor device package unit to the top printed circuit board by way of a first pogo pin of a first length disposed between the semiconductor device package unit and the top printed circuit board; and returning the same second test signal from the top printed circuit board to an input pad of the semiconductor device package unit by way of a second pogo pin of the first length disposed between the semiconductor device package unit and the top printed circuit board to test the semiconductor package unit.