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Microprocessor Chip With Read Only Store for Special Test Routines

IP.com Disclosure Number: IPCOM000051128D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Assimos, C: AUTHOR [+3]

Abstract

A microprocessor has a control store that holds several special test routines and other routines that are used during a test. These test routines are each identified by a code, and during a test a conventional tester supplies a selected code and other information for the microprocessor to execute one of the tests. The tester then responds conventionally to evaluate the results of the test. This system can test certain data paths and functional component groups of the microprocessor that cannot be tested by a conventional tester.

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Microprocessor Chip With Read Only Store for Special Test Routines

A microprocessor has a control store that holds several special test routines and other routines that are used during a test.

These test routines are each identified by a code, and during a test a conventional tester supplies a selected code and other information for the microprocessor to execute one of the tests. The tester then responds conventionally to evaluate the results of the test. This system can test certain data paths and functional component groups of the microprocessor that cannot be tested by a conventional tester.

Conventionally, a tester for a data processor supplies test programs that the processor runs on test data. The processor sends its output to the tester, and the tester compares the output with the output that is expected In the absence of a fault. If the output is abnormal, the tester or its operating personnel analyze the output to identify a failure of a component or a failure in the design. However, some data paths and some components of a microprocessor cannot be tested in this way. An example is the data paths between the memory and other functional blocks on the chip. Providing the test in the microprogram of the processor permits additional tests to be made. Some of the conventional functions of the tester can also be performed by the microprocessor.

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