针对电子系统的顺序上电的争用预防

Contention prevention for sequenced power up of electronic systems

Abstract

本发明公开了一种用于在电子系统的顺序上电期间预防争用的方法和装置。在一个实施例中,装置包括第一电源域和第二电源域,该第一电源域和第二电源域被配置为分别从第一电源和第二电源接收电力。在上电序列期间,第一电源被配置为在第二电源之前提供电力。电力检测电路被配置为检测来自第一电源和第二电源两者的电力的存在。如果尚未从第二电源检测到电力,断言提供给钳位电路的信号。在信号被电力检测电路断言时,钳位电路可禁止从第二电源域接收到的控制信号被提供给第一电源域中的电源开关。
A method and an apparatus for preventing contention during the sequenced power up of an electronic system are disclosed. In one embodiment, the apparatus includes first and second power domains configured to receive power from first and second power sources, respectively. During a power up sequence, the first power source is configured to provide power prior to the second power source. A power detection circuit is configured to detect the presence of power from both of the first and second power sources. If power has not been detected from the second power source, a signal provided to a clamping circuit is asserted. When the signal is asserted by the power detection circuit, the clamping circuit may inhibit the control signal received from the second power domain from being provided to a power switch in the first power domain.

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