The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1988
Filed:
Sep. 15, 1986
David B Papworth, Framingham, MA (US);
Joseph L Ardini, Jr, Needham, MA (US);
Prime Computer, Inc., Natick, MA (US);
Abstract
A data processing system for processing a sequence of program instructions has a pipeline structure including an instruction pipeline and an execution pipeline. Each pipeline has a plurality of serially operating stages. The stages read from and modify memory at various stages of instruction processing. Collisions between data read from a register in the instruction pipeline phase of operation in response to a first instruction and write data written into the register during the execution phase of operation in response to an earlier instruction can be detected and predicted. In response thereto, the new data can be substituted directly for the modified data in the pipeline itself to provide continued valid operation. In addition, the apparatus and method provide for altering the flow of the instructions through the pipeline in order to accommodate newly generated data and to avoid invalid operation.