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A circuit is described for reinitializing the individual clock generators and for correctly and automatically restarting the individual clocks in the case of a clock check.
English (United States)
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Clock Failure Recovery by Automatic Reinitialization and Subsequent
A circuit is described for reinitializing the individual clock generators and for
correctly and automatically restarting the individual clocks in the case of a clock
Clock checks are indispensable for error detection, i.e., for distinguishing
whether a system error was caused by the clock or other sources. By detecting
a clock check in time, for which purpose the parity bits of the shift latch chains
are continuously compared with a compare bit stored in a further latch, system
failure and consequential errors are avoided.
Normally, the system is stopped for a clock check and is subsequently
restarted manually. To automatically restart the system, the patterns stored in
the latches when the system was initially started are stored a second time,
simultaneously resetting the compare bits. This is done by the circuit illustrated
in Fig. 1.
In the case of a clock check, the clock signal is stored in a clock check back-
up latch. Latch L4 is an indicator latch which is sensed in response to an error-
handling routine and which is cleared after the error has been handled by the N-
reset signal. At the same time, the clock check signal activates the stop clock
signal which deactivates all stoppable clocks.
After a delay of one cycle (see Fig. 2) for the stop sequence, the clock check
signal appears at the output of latch L2. This output signal is used to stop the