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Method and apparatus for data transfer between processor elements

  • US 5,253,346 A
  • Filed: 07/23/1990
  • Issued: 10/12/1993
  • Est. Priority Date: 07/21/1989
  • Status: Expired due to Fees
First Claim
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1. A method of data transfer from a first to a second processing element over an external data bus, said first processing element including a processor, a memory and a data transfer controller, such data transfer controller connected to said external data bus, said processor, memory and data transfer controller mutually coupled to an internal data bus, the method comprising:

  • (a) supplying a transfer command signal from said processor to the data transfer controller, for designating that a datum is to be transferred from the first to the second processing element;

    (b) concurrent with step (a), supplying the datum from one of either the processor and the memory to the internal data bus in response to a control signal from the processor; and

    (c) initiating the transfer of the datum from said internal data bus to said second processing element on said external data bus, under the control of the data transfer controller of said first processing element, in response to the transfer command signal.

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