Input signal detection circuit, electronic device, and system

An electronic device comprising:

• a plurality of input terminals;
• a plurality of signal detection units each of which is arranged for each of the plurality of associated input terminals and includes
• a main signal detection unit that detects a signal received from one of the associated input terminals, and
• a sub signal detection unit that generates a failure detection signal that is a signal for detecting a failure of the main signal detection unit;
• and
• a failure detection unit that detects the failure of the main signal detection unit based on the failure detection signal, wherein
• the main signal detection unit detects the signal received from the input terminal that is associated with the signal detection unit that includes the associated main signal detection unit,
• the sub signal detection unit generates the failure detection signal about the main signal detection unit included in the signal detection unit that is different from the signal detection unit that includes the sub signal detection unit, and
• the sub signal detection unit included in each of the plurality of signal detection units exclusively generates the failure detection signal about the main signal detection unit.

A system comprising:

• a plurality of input terminals;
• a plurality of signal detection units each of which is arranged for each of the plurality of associated input terminals and includes
• a main signal detection unit that detects a signal received from one of the associated input terminals, and
• a sub signal detection unit that generates a failure detection signal that is a signal for detecting a failure of the main signal detection unit;
• a failure detection unit that detects the failure of the main signal detection unit based on the failure detection signal;
• and
• a failure information output unit that outputs information on the main signal detection unit in which the failure has been detected, wherein
• the main signal detection unit detects the signal received from the input terminal that is associated with the signal detection unit that includes the associated main signal detection unit,
• the sub signal detection unit generates the failure detection signal about the main signal detection unit included in the signal detection unit that is different from the signal detection unit that includes the sub signal detection unit, and
• the sub signal detection unit included in each of the plurality of signal detection units exclusively generates the failure detection signal about the main signal detection unit.