公开(公告)号：US09647653B2

公开(公告)日：2017-05-09

申请号：US14730473

申请日：2015-06-04

Applicant: Apple Inc.

Inventor： Shu-Yi Yu ,  Jean-Didier Allegrucci ,  Timothy Paaske ,  Deniz Balkan

IPC: H03K5/19 ,  H03K5/26

CPC classification number: H03K5/19 ,  H03K5/26

Abstract: An apparatus may include first and second clock monitors. The first clock monitor may be configured to receive a first clock signal and assert a first signal if the frequency of the first clock signal is greater than a first upper threshold and assert a second signal if the frequency of the first clock signal is less than a first lower threshold. The second clock monitor may be configured to receive a second clock signal with a frequency higher than that of the first clock signal. The second clock monitor may be configured to compare the second clock signal, dependent upon the first clock signal, to second upper and lower thresholds and assert a third signal if the frequency of the second clock signal is greater than the second upper threshold and assert a fourth signal if the frequency is less than the second lower threshold.

公开(公告)号：US20160359476A1

公开(公告)日：2016-12-08

申请号：US14730473

申请日：2015-06-04

Applicant: Apple Inc.

Inventor： Shu-Yi Yu ,  Jean-Didier Allegrucci ,  Timothy Paaske ,  Deniz Balkan

IPC: H03K5/19 ,  H03K5/26

CPC classification number: H03K5/19 ,  H03K5/26

Abstract: An apparatus may include first and second clock monitors. The first clock monitor may be configured to receive a first clock signal and assert a first signal if the frequency of the first clock signal is greater than a first upper threshold and assert a second signal if the frequency of the first clock signal is less than a first lower threshold. The second clock monitor may be configured to receive a second clock signal with a frequency higher than that of the first clock signal. The second clock monitor may be configured to compare the second clock signal, dependent upon the first clock signal, to second upper and lower thresholds and assert a third signal if the frequency of the second clock signal is greater than the second upper threshold and assert a fourth signal if the frequency is less than the second lower threshold.

Abstract translation: 装置可以包括第一和第二时钟监视器。 如果第一时钟信号的频率大于第一上限阈值，则第一时钟监视器可以被配置为接收第一时钟信号并且断言第一信号，并且如果第一时钟信号的频率小于第一时钟信号，则断言第二信号 第一个下限 第二时钟监视器可以被配置为接收频率高于第一时钟信号的频率的第二时钟信号。 第二时钟监视器可被配置为根据第一时钟信号将第二时钟信号与第二上限和下限阈值进行比较，并且如果第二时钟信号的频率大于第二上限阈值则断言第三信号，并且断言第 第四信号，如果频率小于第二较低阈值。