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Data storage system having separate data transfer section and message network with trace buffer

  • US 6,611,879 B1
  • Filed: 04/28/2000
  • Issued: 08/26/2003
  • Est. Priority Date: 04/28/2000
  • Status: Expired due to Term
First Claim
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1. A system comprising:

  • a central processing unit for producing information during each of a sequence of bus cycles;

    a system resource;

    a bus coupled between the system resource and the central processing unit, such bus having produced thereon the sequence of information produced by the central processing unit;

    a trace buffer coupled to the bus, such trace buffer having a memory for storing the sequence of information produced on the bus at each of the sequence of bus cycles, such trace buffer comprising;

    a register for storing a digital word, such digital word representing a specific control function;

    wherein the memory comprises a buffer memory adapted to stored therein a data portion of the information from the central processing unit;

    a trace buffer controller, fed an address and control portion of the information from the central processing unit and responsive to the digital word stored in the register, for indicating to the controller whether data from the central processor should be stored in the buffer memory;

    whether storage of the data from the central processing unit should be stopped;

    or, whether data from the central processing unit and stored in the buffer memory should be read from such buffer memory by the central processing unit.

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