Patent ID: 8829940
Filing Date: 2014-09-09
Classification: G01R

Abstract:
1. A method of testing a partially assembled multi-die device said device comprising: a carrier comprising a device-level test data input and a device-level test data output; and a first die on the carrier, the first die having a test access port comprising a primary test data input, a secondary test data input and a test data output, the test access port being controlled by a test access port controller; wherein the secondary test data input of the first die is communicatively coupled to the device-level test data input, and the test data output of the first die is communicatively coupled to the device-level test data output; which method comprises the steps of: bringing the first die into a state in which the first die accepts test instructions from its secondary test data input; providing test data to the first die, including providing the secondary test data input of the first die with test instructions through the device-level test data input; and collecting a test result from the first die on the device-level test data output.