Clock supervision unit

摘要

The present invention relates to a clock supervision unit (100) and an electronic system clocked by at least one clock (c*) and using the clock supervision unit (100). The clock supervision unit (100) analyzes the at least one clock (c*) based on a monitor clock (m*) provided together with the at least one clock (c*) or separately to the clock supervision unit (100). The clock supervision unit (100) at least comprises an activity unit (210), a deviation unit (220) and an auxiliary clock generator (240). The auxiliary clock generator (240) outputs an auxiliary clock (a*). The activity unit (210) detects the presence of the monitor clock (m*) based on the auxiliary clock (a*) and the presence of the auxiliary clock (a*) based on the monitor clock (m*). The deviation unit (220) detects clock faults in the monitor clock (m*) based on the auxiliary clock (a*). With the clock supervision unit (100) according to the present invention, the at least one clock (c*) can be supervised in more detail and it is possible to react on different clock faults in the at least one clock c* with different error handling procedures, e.g. by initiating a shutdown of the devices controlled by the electronic system.

主权项

1. An electronic system for analyzing a set of periphery clock signals based on a monitor clock of the set of periphery clock signals and providing information about the set of periphery clock signals, comprising:
a clock generation unit adapted to receive an external clock signal, derive the set of periphery clock signals based on the external clock signal, and select one of the periphery clock signals as the monitor clock; an internal clock generator adapted to generate an auxiliary clock signal independently of the external clock signal; an activity unit adapted to detect the presence of the monitor clock based on the auxiliary clock signal and detect the presence of the auxiliary clock signal based on the monitor clock, the activity unit includes a monitor clock missing unit clocked by the auxiliary clock signal and continuously reset by the monitor clock; and a deviation unit adapted to detect clock faults in the monitor clock based on the auxiliary clock signal in case that the auxiliary clock signal and the monitor clock are present and adapted to check the remaining clocks in the set of periphery clocks based on the monitor clock, if the monitor clock is present and no clock faults have been detected.