DECOMPRESSION METHOD FOR STORING TEST DATA BASED ON IRRATIONAL NUMBER

摘要

A decompression method for storing test data based on an irrational number, by which a test can be operated when decompression is performed via dichotomy through multiple iterations, and a complex extraction operation and the waiting time of the extraction operation can both be avoided. The decompression method comprises the following steps: a, converting an original test set into an integer corresponding to at least one irrational number: AA; b, a control computer estimating a single-precision or double-precision decimal corresponding to a single irrational number in step a: b₀.b₁b₂ …b_n-1b_n, it is recorded that t₁＝b₀.b₁b₂ …b_n-1(b_n - 1) and t₂＝b₀.b₁b₂ …b_n-1(b_n + 1), converting run-lengths corresponding to an integral part b0 and a first n-1 decimal part b_n-1 into test vectors and then successively inputting same into a chip to be tested, and recording the number (num) of run-lengths transmitted to an ATE channel; c, recording BB; d, CC, and judging sizes of (t'l)^k and m; g, when (t'l)^k = m, transmitting a run-length staring from the num and ending at p to the chip to be tested; and h, comparing a test result with a theoretical value, if the result is consistent, then the chip to be tested passes the test, otherwise, failing the test.