Programmable sequence generator for in-circuit digital testing
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United States of America Patent
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Jul 13, 1982
Grant Date -
N/A
app pub date -
Jun 17, 1980
filing date -
Jun 17, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit for use in an in-circuit digital tester for generating data bus and control line test signals to test the electrical performance properties of components in a circuit under test is disclosed. Certain components in a circuit under test, such as microprocessors, are bus oriented devices which perform their functions in predetermined cycles. These cycles have been divided up into control signals and data bus signals. Each sequence of control signals are referred to as a protocol sequence. Each test pin in the bed of nails test fixture has a digital test signal generator associated therewith. The present invention operates to program each test signal generator with digital test signal generating data to produce each protocol sequence of the device under test. Test cycles are then run in which a predetermined sequence of protocol sequences are generated to test the device. This predetermined sequence in protocol sequences is specified by a sequence in starting addresses of the various protocol sequences programmed into the generators.
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