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FDDI network test adapter history store circuit (HSC)

  • US 5,394,390 A
  • Filed: 10/29/1993
  • Issued: 02/28/1995
  • Est. Priority Date: 10/29/1993
  • Status: Expired due to Fees
First Claim
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1. A history store circuit that provides an interface between a physical (PHY) layer hardware and a memory system to record symbol stream segments received from a fiber optic distributed data interface (FDDI) network, comprising:

  • a symbol stream comparator (17) connected to receive an incoming symbol stream from said physical layer hardware for comparing said incoming symbol stream with a symbol trigger sequence received from said FDDI network and for generating a compare output if a match occurs;

    history store triggering logic (18,

         19) responsive to said compare output from said symbol stream comparator to control symbol stream data storage in said memory system, said history store triggering logic having a plurality of modes of operation; and

    a node processor interface (20) connected to said symbol stream comparator and said history store triggering logic for functioning as a control and status interface for a node processor, said node processor for controlling the modes of operation of said history store triggering logic and for reading conditions of said symbol stream comparator, said memory system and said history store triggering logic.

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