METHOD FOR SEPARATING CIRCUIT FAULT

摘要

PROBLEM TO BE SOLVED: To easily separate a fault by gating the input of a signature resistor in an active state merely for a range with the specific pattern of a built-in self test(BIST). SOLUTION: A signature dimension is controlled by gating the input of a plurality of input signature resistors(MISR) merely in the specific range of a logic built-in self test(LBIST) pattern. More specifically, an MISR shift resistor sequence generator(SSG) control block 10 generates a gate enable signal to one or a plurality of gates 11 for an MISR input in each cycle where data is clocked to the MISR. The MISRSS control block 10 is driven by an LBIST engine 13, and is synchronized by timing being given by an on product clock generator(OPCG) 12 and a phase-locked loop(PLL) 14.