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Alarm mechanism

  • US 6,870,904 B2
  • Filed: 02/14/2001
  • Issued: 03/22/2005
  • Est. Priority Date: 02/14/2001
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring alarm conditions, the method comprising:

  • receiving an indication of a change in state of an alarm;

    recording the change in state of the alarm in a first register;

    recording the current state of the changed alarm in a second register;

    generating an interrupt;

    wherein receiving an indication of a change in state of an alarm comprises receiving an indication of an alarm condition when at least two cells are received on communication line with corrupted synchronization patterns.

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