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Interrupt transmission via specialized bus cycle within a symmetrical multiprocessing system

  • US 5,781,187 A
  • Filed: 02/03/1997
  • Issued: 07/14/1998
  • Est. Priority Date: 05/31/1994
  • Status: Expired due to Term
First Claim
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1. A multiprocessing computer system, comprising:

  • a plurality of processing units coupled to a first bus;

    first and second I/O devices coupled to a second bus;

    a bus bridge coupling said first bus to said second bus and configured to selectively write data to said first and second I/O devices by executing I/O write cycles on a set of lines of said second bus; and

    an interrupt controller coupled to said second bus and configured to process a first interrupt request signal received from said first I/O device coupled to said second bus, said interrupt request signal being conveyed on a dedicated interrupt signal line;

    wherein said interrupt controller is further configured to receive a second interrupt request signal from said second I/O device, wherein said second interrupt request signal is conveyed as a predetermined encoded interrupt cycle driven upon said set of lines of said second bus.

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