| 摘要 |
PURPOSE:To obtain a function evaluating method which decreases the number of test sequences and facilitates a function test by comparing a test output with an expected value when converting operation in which a test output is converted into a test input different in value is repeated specific times. CONSTITUTION:The test output corresponding to a test input to a multiplying circuit 1 whose functions are to be evaluated is passed through a feedback loop control part 2 and converted by a data conversion part 3 into a value different from the last test input, and the value is fed back to the circuit 1. This repetitive test is carried out by the control part 2 until the counted value of a feedback frequency attains to a set value and the test output after the specific-time repetition is compared with an expected output obtained when similar repetition regarding a reference circuit is performed, thus performing evaluation. Therefore, even when the number of bits of the circuit to be tested increases, the number of test sequences is suppressed, and the function evaluating method which facilitates the function test is obtained. |
