公开(公告)号：JPH07154451A

公开(公告)日：1995-06-16

申请号：JP15344594

申请日：1994-07-05

Applicant: TANDEM COMPUTERS INC

Inventor： JIYON SHII FURIIMAN ,  CHIEN GAN KON

IPC: G06F13/00 ,  H04L1/00 ,  H04L29/06 ,  H04L29/14 ,  G06F15/16

Abstract: PURPOSE: To make it possible to reconstitute a system by checking whether a data field generated in specific communication is to be allowed by a communication protocol or inhibited. CONSTITUTION: Respective M and N fields generated from a bus are latched by M and N latches 32, 34 at proper time and respectively sent to a row MUX 35 and a column MUX 36 and unique row and column corresponding to respective fields are selected. A selected output is sent to one input of an output AND gate 38 and a timing window signal (optional) is sent to the other input to generate a clocked error signal. Thus an error check signal for instructing whether a pair of 1st and 2nd data fields are to be allowed by a communication protocol or not is selected, and when the prescribed pair is not allowed by the communication protocol, the selected error check signal stops the specific communication operation.

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.