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:
Mar. 30, 1999
Filed:
Dec. 12, 1997
Thang M Tran, Austin, TX (US);
Mauricio Calle, Austin, TX (US);
Shane Southard, Cedar Park, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A superscalar microprocessor predecodes instruction data to identify the boundaries of instructions and the type of instruction. In one embodiment, to expedite the dispatch of instructions, the first microcode instruction of the cache line is identified during predecode and stored as a microcode pointer. When the cache line is scanned for dispatch, the microcode pointer is used to identify the first microcode instruction which is conveyed to the MROM unit. In another embodiment, the first scanned instruction is predicted to be a microcode instruction and is dispatched to the MROM unit. A microcode scan circuit uses the microcode pointer and the functional bits of the predecode data to multiplex instruction specific bytes of the first microcode instruction to the MROM unit. If the predicted first microcode instruction is not the actual first microcode instruction, then in a subsequent clock cycle, the actual microcode instruction is dispatched the MROM unit and the incorrectly predicted microcode instruction is canceled.