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High speed parallel bus and data transfer method

  • US 4,570,220 A
  • Filed: 11/25/1983
  • Issued: 02/11/1986
  • Est. Priority Date: 11/25/1983
  • Status: Expired due to Fees
First Claim
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1. A high speed parallel bus structure for transferring data between a plurality of data processing devices ("agents"), comprising:

  • address data lines for transmitting address and data information between said agents;

    command lines for transmitting commands from a requesting agent to a replying agent, such that said requesting agent may transmit a requester ready (REQ RDY) signal to said replying agent notifying said replying agent that said requestor is ready to proceed with the data operation identified by said command, and a replier ready signal (REPLY RDY) transmitted by said replying agent on said command lines notifying said requesting agent that said replying agent is prepared to proceed with said data operation;

    said command lines being reallocated between said requesting and replying agents once said command has been transmitted, thereby permitting the transmission of said REQ RDY and REPLY RDY signals;

    said data to be transferred being considered valid only upon the assertion of both said REQ RDY and REPLY RDY signals;

    message control means coupled to each of said agents in said bus structure for coupling said agents to said parallel bus;

    said message control means further including arbitration means for allocating the use of said parallel bus between agents;

    whereby data is transferred between agents at high speed.

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