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Sharing Method of Edge-Mode Interrupt Signal

IP.com Disclosure Number: IPCOM000117006D
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Fujihara, S: AUTHOR

Abstract

Disclosed is a sharing method of edge-mode interrupt signal on a system where plural interrupt signal generators share one physical interrupt line, which generate an interrupt signal asynchronously. Fig. 1 shows the functional configuration of this method. In the Fig. 1: 1. Interrupt Generator 1,2..,N generate an interrupt signal when they need an interrupt service. 2. Interrupt Identifier informs which Interrupt Generator generates the interrupt signal. 3. Interrupt Signal OR Gate makes logical OR of all interrupt signals. 4. Interrupt Mask Circuit holds a signal set by an Interrupt Processor. 5.

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Sharing Method of Edge-Mode Interrupt Signal

      Disclosed is a sharing method of edge-mode interrupt signal on
a system where plural interrupt signal generators share one physical
interrupt line, which generate an interrupt signal asynchronously.
Fig. 1 shows the functional configuration of this method.  In the
Fig. 1:
  1.  Interrupt Generator 1,2..,N generate an interrupt signal when
       they need an interrupt service.
  2.  Interrupt Identifier informs which Interrupt Generator
generates
       the interrupt signal.
  3.  Interrupt Signal OR Gate makes logical OR of all interrupt
       signals.
  4.  Interrupt Mask Circuit holds a signal set by an Interrupt
       Processor.
  5.  Interrupt Mask Signal AND Gate makes logical AND of the
Interrupt
       Signal OR Gate out and Interrupt Mask Signal out, which is the
       shared interrupt signal of all the interrupt signals.

This method makes following process possible:
  1.  The Interrupt Processor can proceed all the interrupt services
       to the interrupt generators which generates an interrupt
signal.
  2.  When an interrupt(s) is generated while the Interrupt Processor
       is proceeding an interrupt service, the method can generates
an
       interrupt active edge again corresponding to the interrupt
       generated.

      Fig. 2 shows an example of the interrupt sharing sequence.  The
example shows the steps following:...