Patent
1997-02-13
1999-04-06
Donaghue, Larry D.
395391, 395393, G06F 938
Patent
active
058929630
ABSTRACT:
Tag monitoring system for assigning tags to instructions. A memory unit stores instructions to be executed by an execution unit. Before execution an instruction fetch unit decodes the instructions. A register file stores the decoded instructions. A queue having a plurality of slots containing tags which are used for tagging the decoded instructions. A control unit assigns the tags to decoded instructions, monitors the completion of executed instructions, and advances the tags in the queue upon completion of an executed instruction. The register stores a given decoded instruction at an address location in the register file defined by the tag assigned to that instruction. The register file also contains a plurality of read address enable ports and corresponding read output ports. Each of the slots from the queue is coupled to a corresponding one of the read address enable ports. Thus, a a decoded instruction is read out of a read output port enabled by the tag assigned to that decoded instruction in program order.
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Deosaran Trevor Anthony
Garg Sanjiv
Iadonato Kevin Ray
Donaghue Larry D.
Seiko Epson Corporation
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