Internal cache for on chip test data storage
First Claim
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1. A method of testing a semiconductor device comprising:
- selecting a portion of a memory, said memory comprised by said semiconductor device;
testing said selected portion of said memory;
designating said selected portion of said memory as a designated memory in response to an acceptable testing result; and
storing data in said designated portion of said memory for retrieval at a later time, said data comprising test data resultant from additional testing of said semiconductor device and unrelated to testing said selected portion of said memory.
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Abstract
A method of testing a semiconductor device having a memory is disclosed. The method includes selecting a portion of the memory; testing the selected portion of the memory; designating the selected portion of the memory as a designated memory in response to an acceptable testing result; and storing data in the designated portion of the memory for retrieval at a later time. Provision for soft repair of the selected memory is made. Test data can be compressed before being stored in the designated memory.
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Citations
33 Claims
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1. A method of testing a semiconductor device comprising:
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selecting a portion of a memory, said memory comprised by said semiconductor device;
testing said selected portion of said memory;
designating said selected portion of said memory as a designated memory in response to an acceptable testing result; and
storing data in said designated portion of said memory for retrieval at a later time, said data comprising test data resultant from additional testing of said semiconductor device and unrelated to testing said selected portion of said memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of testing a semiconductor device having a memory, comprising:
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providing a designated memory;
performing ABIST on a memory segment to generate memory test data;
storing said memory test data in said designated memory; and
retrieving said test data at a later time. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of testing a semiconductor device having a memory, comprising:
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providing a designated memory;
performing an LBIST on a device logic function to generate a set of LBIST signatures;
storing said LBIST signatures in said designated memory; and
retrieving said LBIST signatures at a later time. - View Dependent Claims (17, 18, 19, 20)
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21. A method of testing a function of a semiconductor device having a memory, comprising:
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providing a designated memory;
performing a first test using a test pattern in a first corner of the test specification of said function of said semiconductor device;
storing the result of said first test in said designated memory;
performing a second test using said test pattern in a second corner of the test specification of said function of said semiconductor device;
retrieving said first test result from said designated memory; and
comparing said first test result with said second test result. - View Dependent Claims (22, 23, 24, 25)
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26. A semiconductor device comprising:
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a memory;
an ABIST engine adapted to test said memory; and
an interface adapted to send test data to and receive test data from a designated portion of said memory, said test data comprising data unrelated to testing said memory. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification