System and Method for Wirelessly Testing Integrated Circuits

• US 20110244814A1
• Filed: 09/22/2009
• Published: 10/06/2011
• Est. Priority Date: 09/22/2008
• Status: Active Grant

• Current Assignee: Centre National De La Recherche Scientifique
• Original Assignee: Centre National De La Recherche Scientifique
• Inventors: Cauvet, Philippe, Andreu, David, Noun, Ziad, Flottes, Marie-Lise, Bernard, Serge
• Granted Patent: US 8,792,835 B2
• Time in Patent Office: Days
• US Class Current: 455/90.1
• CPC Class Codes: G01R 31/3025 Wireless interface with the DUT
• CPC Class Codes: G01R 31/31722 Addressing or selecting of test units, e.g. transmission protocols for selecting test units for scan test G01R31/318558
• CPC Class Codes: G01R 31/31903 tester configuration

Abstract

A system and method for wirelessly testing integrated circuits provides a multiple layer interface to wirelessly test integrated circuits. A wireless testing structure for an integrated circuit comprises a wireless transceiver and a wireless test interface. The wireless transceiver is configured to receive test information from a tester and transmit test result information to the tester. The wireless test interface is configured to interface between the wireless transceiver and the integrated circuit. The wireless test interface comprises a media access controller and a test control block. The media access controller is configured to implement a media access control protocol for wireless communication. The test control block is configured to decode test information received from the tester, to trigger a test of the integrated circuit in response to the decoded test information, and to encode test result information that is generated by the integrated circuit in response to the test.

Claims

1. A wireless testing structure for an integrated circuit, comprising:

a wireless transceiver configured to receive test information from a tester and transmit test result information to the tester; and

a wireless test interface configured to interface between the wireless transceiver and the integrated circuit, the wireless test interface comprising;

a media access controller configured to implement a media access control protocol for wireless communication; and

a test control block configured to decode test information received from the tester, to trigger a test number of different types of tests of the integrated circuit in response to the decoded test information, and to encode test result information that is generated by the integrated circuit in response to the test; and

a test control block including a comparator configured to compare the test result information generated by the integrated circuit with a comparison vector and to produce a comparison result as the test result information.

2. The wireless testing structure of claim 1, wherein the test control block includes an application layer configured to decode an incoming packet carrying the test information including control signals and test data, to trigger a number of different types of tests for the integrated circuit in response to the decoded incoming packet, and to encode the test result information into an outgoing packet;

the tests that can be triggered by the application layer including, built in self tests (BIST) and external tests such as an interconnections test or an internal scan test.

3. The wireless testing structure of claim 2, wherein the application layer includes a decoder configured to analyze the incoming packet and to retrieve the test information from the incoming packet according to the analysis, and an encoder configured to encode the test result information into the outgoing packet;

test result packets being able to carry different types of information depending on whether the comparison of the test result information takes place in the wireless test interface or in the tester.

4. The wireless testing structure of claim 1, wherein the comparator is further configured to compare the test result information generated by the integrated circuit with the comparison vector according to a masking vector which indicates the specific bit(s) of the test result information to be compared with the corresponding bit(s) of the comparison vector, in order to guarantee the detection of a defective integrated circuit even in the presence of unknown logic values.

5. The wireless testing structure of claim 1, further comprising a test signal router configured to route the test information to a corresponding circuit block of the integrated circuit and route the test result information generated by the corresponding circuit block of the integrated circuit in response to the test to the wireless testing structure.

6. The wireless testing structure of claim 5, wherein the test signal router is a SiP Test Access Port.

7. The wireless testing structure of claim 1, wherein the wireless testing structure is separated from the integrated circuit, while allowing simultaneously testing of a number of integrated circuits, while allowing simultaneously testing of a number of integrated circuits.

8. The wireless testing structure of claim 1, wherein the wireless testing structure is at least partially integrated in the integrated circuit, allowing thus simultaneously testing of a number of integrated circuits after fabrication and while the integrated circuits are still in wafer form or, testing integrated circuits after the integrated circuits have been packaged and put into use for their intended purpose.

9. The wireless testing structure of claim 1, wherein the media access control protocol is configured to support broadcast, multicast, and unicast modes;

the media access control protocol being used in the multicast mode to establish groups that allow the tester to exclude faulty integrated circuits by assigning them to at least one group according to their fault type, or to test a heterogeneous wafer by assigning each type of integrated circuit to a specific group;

the media access control protocol being used in the unicast mode to enable the tester to communicate individually with one integrated circuit to conduct single integrated circuit testing.

10. A method for wirelessly testing an integrated circuit comprising:

wirelessly transmitting test information to at least one integrated circuit using a media access control protocol;

wirelessly receiving test information using the media access control protocol;

decoding the test information and triggering a number of different types of test of the integrated circuit in response to the decoded test information;

encoding test result information that is generated by the integrated circuit in response to the test;

comparing the test result information generated by the integrated circuit with a comparison vector and producing a comparison result as the test result information; and

wirelessly transmitting the encoded test result information using the media access control protocol.

11. The method of claim 10, wherein decoding the test information includes analyzing an incoming packet carrying the test information and retrieving the test information from the incoming packet according to the analysis, and wherein encoding test result information that is generated by the integrated circuit in response to the test includes encoding the test result information into an outgoing packet;

test result packets being able to carry different types of information depending on whether the comparison of the test result information takes place in the wireless test interface or in the tester.

12. The method of claim 11, further comprising comparing the test result information generated by the integrated circuit with the comparison vector according to a masking vector.

13. The method of claim 10, wherein the media access control protocol supports broadcast, multicast, and unicast modes;

the media access control protocol being used in the multicast mode to establish groups that allow the tester to exclude faulty integrated circuits by assigning them to at least one group according to their fault type, or to test a heterogeneous wafer by assigning each type of integrated circuit to a specific group;

the media access control protocol being used in the unicast mode to enable the tester to communicate individually with one integrated circuit to conduct single integrated circuit testing.

14-20. -20. (canceled)