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Shared memory multiprocessor with data hiding and post-store

  • US 5,251,308 A
  • Filed: 06/22/1989
  • Issued: 10/05/1993
  • Est. Priority Date: 12/22/1987
  • Status: Expired due to Fees
First Claim
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1. A digital data processing system comprisingA. plural processing cells, each comprising a central processing unit and an associated memory element for storing information-representative signals, said plural memory elements together forming a common memory,B. each said central processing unit including access request means for generating an access-request signal representative of a request for access to an information-representative signal stored in said common memory, andC. each said processing cell including memory management means, coupled to the corresponding central processing unit and memory element of that processing cell, for selectively responding to an access-request signal for at least signaling the availability of an information-representative signal stored in that corresponding memory element,the memory management means of respective processing cells being coupled to one another for selective transfer of access-request signals therebetween,D. each said memory management means including directory means for storing an ANCHOR signal corresponding to each of at least selected information-representative signals in the corresponding memory element, said ANCHOR signal being indicative of a mode by which the corresponding information-representative signal is accessible,E. said memory management means including means for responding to an access-request signal generated by any of said central processing units directed to an information-representative signal having an ANCHOR signal indicative of a first alternative mode of access for at least signaling the requesting central processing unit that the requested information-representative signal is stored in said common memory, andF. said memory management means including means for responding to an access-request signali) generated by the central processing unit corresponding to that memory management means and directed to an information-representative signal stored within the corresponding memory element, which information-representative signal is associated with an ANCHOR signal indicative of a second alternative mode of access, for signaling that corresponding central processing unit that the requested information-representative signal is stored in said common memory, andii) generated by any other of said central processing units directed to that same information-representative signal for signaling the requesting central processing unit that the requested information-representative signal is not stored in said common memory.

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