公开(公告)号：US20180137283A1

公开(公告)日：2018-05-17

申请号：US15814115

申请日：2017-11-15

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Haofeng WANG ,  Jiayin LU ,  Chongliang MA

IPC: G06F21/57 ,  G06F21/72 ,  G06F1/06 ,  G06F11/30 ,  G06F11/34

CPC classification number: G06F21/57 ,  G06F1/06 ,  G06F11/3024 ,  G06F11/3058 ,  G06F11/348 ,  G06F11/3495 ,  G06F21/72 ,  G06F21/75 ,  G06F2221/034

Abstract: The present invention provide a method and a detection circuit for detecting a security chip operating slate. The detection circuit includes: a first register unit, a triggering unit, a delay unit, a routing unit, and a second register unit, where the second register unit is connected to the triggering unit. A first signal is delayed in the delay unit, to obtain a second signal, a third signal is obtained according to the second signal, and logical operation is performed on the first signal and the third signal, to output a level signal to trigger an alarm unit. Because each unit may be implemented by using a digital circuit, a size of the circuit can be reduced.