公开(公告)号：JPH07141220A

公开(公告)日：1995-06-02

申请号：JP14450494

申请日：1994-06-27

Applicant: TANDEM COMPUTERS INC

Inventor： SUTEIIBUN DABURIYUU HAMIRUTON ,  UORUTAA II GIBUSON ,  CHIEN GAN KON

IPC: G06F11/22 ,  G01R31/3185

Abstract: PURPOSE: To provide a method and a device for providing the state of a scan disabled part in a scanning chain for copying and storing a registration state transferred by a scannable component to a scannable register included in scannable circuitry and allowing the observation of the registration state without the defect of an unscannable element by scanning for testing the scannable component. CONSTITUTION: A scannable logic is provided with one or more storage registers for maintaining the copy of data transmitted from a scannable unit to the register of an unscannable unit. When the scannable unit is the object of a scanning test, the register includes corresponding state information to be transferred to the unscannable unit. When the scannable and unscannable units are installed to execution conditions, the register supplies the state information to the unscannable unit so at to continue an operation.